2052 lines
53 KiB
C
2052 lines
53 KiB
C
/*
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* Optimizations for Tiny Code Generator for QEMU
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*
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* Copyright (c) 2010 Samsung Electronics.
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* Contributed by Kirill Batuzov <batuzovk@ispras.ru>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/int128.h"
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#include "tcg/tcg-op.h"
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#include "tcg-internal.h"
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#define CASE_OP_32_64(x) \
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glue(glue(case INDEX_op_, x), _i32): \
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glue(glue(case INDEX_op_, x), _i64)
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#define CASE_OP_32_64_VEC(x) \
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glue(glue(case INDEX_op_, x), _i32): \
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glue(glue(case INDEX_op_, x), _i64): \
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glue(glue(case INDEX_op_, x), _vec)
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typedef struct TempOptInfo {
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bool is_const;
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TCGTemp *prev_copy;
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TCGTemp *next_copy;
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uint64_t val;
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uint64_t z_mask; /* mask bit is 0 if and only if value bit is 0 */
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} TempOptInfo;
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typedef struct OptContext {
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TCGContext *tcg;
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TCGOp *prev_mb;
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TCGTempSet temps_used;
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/* In flight values from optimization. */
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uint64_t a_mask; /* mask bit is 0 iff value identical to first input */
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uint64_t z_mask; /* mask bit is 0 iff value bit is 0 */
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TCGType type;
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} OptContext;
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static inline TempOptInfo *ts_info(TCGTemp *ts)
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{
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return ts->state_ptr;
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}
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static inline TempOptInfo *arg_info(TCGArg arg)
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{
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return ts_info(arg_temp(arg));
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}
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static inline bool ts_is_const(TCGTemp *ts)
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{
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return ts_info(ts)->is_const;
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}
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static inline bool arg_is_const(TCGArg arg)
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{
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return ts_is_const(arg_temp(arg));
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}
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static inline bool ts_is_copy(TCGTemp *ts)
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{
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return ts_info(ts)->next_copy != ts;
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}
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/* Reset TEMP's state, possibly removing the temp for the list of copies. */
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static void reset_ts(TCGTemp *ts)
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{
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TempOptInfo *ti = ts_info(ts);
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TempOptInfo *pi = ts_info(ti->prev_copy);
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TempOptInfo *ni = ts_info(ti->next_copy);
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ni->prev_copy = ti->prev_copy;
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pi->next_copy = ti->next_copy;
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ti->next_copy = ts;
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ti->prev_copy = ts;
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ti->is_const = false;
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ti->z_mask = -1;
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}
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static void reset_temp(TCGArg arg)
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{
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reset_ts(arg_temp(arg));
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}
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/* Initialize and activate a temporary. */
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static void init_ts_info(OptContext *ctx, TCGTemp *ts)
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{
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size_t idx = temp_idx(ts);
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TempOptInfo *ti;
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if (test_bit(idx, ctx->temps_used.l)) {
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return;
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}
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set_bit(idx, ctx->temps_used.l);
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ti = ts->state_ptr;
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if (ti == NULL) {
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ti = tcg_malloc(sizeof(TempOptInfo));
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ts->state_ptr = ti;
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}
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ti->next_copy = ts;
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ti->prev_copy = ts;
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if (ts->kind == TEMP_CONST) {
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ti->is_const = true;
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ti->val = ts->val;
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ti->z_mask = ts->val;
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if (TCG_TARGET_REG_BITS > 32 && ts->type == TCG_TYPE_I32) {
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/* High bits of a 32-bit quantity are garbage. */
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ti->z_mask |= ~0xffffffffull;
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}
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} else {
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ti->is_const = false;
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ti->z_mask = -1;
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}
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}
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static TCGTemp *find_better_copy(TCGContext *s, TCGTemp *ts)
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{
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TCGTemp *i, *g, *l;
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/* If this is already readonly, we can't do better. */
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if (temp_readonly(ts)) {
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return ts;
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}
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g = l = NULL;
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for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
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if (temp_readonly(i)) {
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return i;
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} else if (i->kind > ts->kind) {
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if (i->kind == TEMP_GLOBAL) {
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g = i;
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} else if (i->kind == TEMP_LOCAL) {
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l = i;
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}
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}
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}
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/* If we didn't find a better representation, return the same temp. */
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return g ? g : l ? l : ts;
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}
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static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2)
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{
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TCGTemp *i;
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if (ts1 == ts2) {
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return true;
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}
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if (!ts_is_copy(ts1) || !ts_is_copy(ts2)) {
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return false;
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}
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for (i = ts_info(ts1)->next_copy; i != ts1; i = ts_info(i)->next_copy) {
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if (i == ts2) {
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return true;
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}
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}
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return false;
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}
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static bool args_are_copies(TCGArg arg1, TCGArg arg2)
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{
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return ts_are_copies(arg_temp(arg1), arg_temp(arg2));
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}
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static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src)
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{
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TCGTemp *dst_ts = arg_temp(dst);
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TCGTemp *src_ts = arg_temp(src);
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TempOptInfo *di;
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TempOptInfo *si;
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uint64_t z_mask;
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TCGOpcode new_op;
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if (ts_are_copies(dst_ts, src_ts)) {
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tcg_op_remove(ctx->tcg, op);
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return true;
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}
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reset_ts(dst_ts);
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di = ts_info(dst_ts);
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si = ts_info(src_ts);
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switch (ctx->type) {
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case TCG_TYPE_I32:
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new_op = INDEX_op_mov_i32;
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break;
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case TCG_TYPE_I64:
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new_op = INDEX_op_mov_i64;
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break;
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case TCG_TYPE_V64:
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case TCG_TYPE_V128:
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case TCG_TYPE_V256:
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/* TCGOP_VECL and TCGOP_VECE remain unchanged. */
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new_op = INDEX_op_mov_vec;
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break;
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default:
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g_assert_not_reached();
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}
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op->opc = new_op;
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op->args[0] = dst;
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op->args[1] = src;
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z_mask = si->z_mask;
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if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_mov_i32) {
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/* High bits of the destination are now garbage. */
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z_mask |= ~0xffffffffull;
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}
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di->z_mask = z_mask;
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if (src_ts->type == dst_ts->type) {
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TempOptInfo *ni = ts_info(si->next_copy);
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di->next_copy = si->next_copy;
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di->prev_copy = src_ts;
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ni->prev_copy = dst_ts;
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si->next_copy = dst_ts;
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di->is_const = si->is_const;
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di->val = si->val;
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}
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return true;
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}
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static bool tcg_opt_gen_movi(OptContext *ctx, TCGOp *op,
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TCGArg dst, uint64_t val)
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{
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/* Convert movi to mov with constant temp. */
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TCGTemp *tv = tcg_constant_internal(ctx->type, val);
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init_ts_info(ctx, tv);
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return tcg_opt_gen_mov(ctx, op, dst, temp_arg(tv));
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}
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static uint64_t do_constant_folding_2(TCGOpcode op, uint64_t x, uint64_t y)
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{
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uint64_t l64, h64;
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switch (op) {
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CASE_OP_32_64(add):
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return x + y;
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CASE_OP_32_64(sub):
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return x - y;
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CASE_OP_32_64(mul):
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return x * y;
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CASE_OP_32_64(and):
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return x & y;
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CASE_OP_32_64(or):
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return x | y;
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CASE_OP_32_64(xor):
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return x ^ y;
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case INDEX_op_shl_i32:
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return (uint32_t)x << (y & 31);
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case INDEX_op_shl_i64:
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return (uint64_t)x << (y & 63);
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case INDEX_op_shr_i32:
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return (uint32_t)x >> (y & 31);
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case INDEX_op_shr_i64:
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return (uint64_t)x >> (y & 63);
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case INDEX_op_sar_i32:
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return (int32_t)x >> (y & 31);
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case INDEX_op_sar_i64:
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return (int64_t)x >> (y & 63);
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case INDEX_op_rotr_i32:
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return ror32(x, y & 31);
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case INDEX_op_rotr_i64:
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return ror64(x, y & 63);
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case INDEX_op_rotl_i32:
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return rol32(x, y & 31);
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case INDEX_op_rotl_i64:
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return rol64(x, y & 63);
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CASE_OP_32_64(not):
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return ~x;
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CASE_OP_32_64(neg):
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return -x;
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CASE_OP_32_64(andc):
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return x & ~y;
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CASE_OP_32_64(orc):
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return x | ~y;
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CASE_OP_32_64(eqv):
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return ~(x ^ y);
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CASE_OP_32_64(nand):
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return ~(x & y);
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CASE_OP_32_64(nor):
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return ~(x | y);
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case INDEX_op_clz_i32:
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return (uint32_t)x ? clz32(x) : y;
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case INDEX_op_clz_i64:
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return x ? clz64(x) : y;
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case INDEX_op_ctz_i32:
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return (uint32_t)x ? ctz32(x) : y;
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case INDEX_op_ctz_i64:
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return x ? ctz64(x) : y;
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case INDEX_op_ctpop_i32:
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return ctpop32(x);
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case INDEX_op_ctpop_i64:
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return ctpop64(x);
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CASE_OP_32_64(ext8s):
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return (int8_t)x;
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CASE_OP_32_64(ext16s):
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return (int16_t)x;
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CASE_OP_32_64(ext8u):
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return (uint8_t)x;
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CASE_OP_32_64(ext16u):
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return (uint16_t)x;
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CASE_OP_32_64(bswap16):
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x = bswap16(x);
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return y & TCG_BSWAP_OS ? (int16_t)x : x;
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CASE_OP_32_64(bswap32):
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x = bswap32(x);
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return y & TCG_BSWAP_OS ? (int32_t)x : x;
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case INDEX_op_bswap64_i64:
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return bswap64(x);
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case INDEX_op_ext_i32_i64:
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case INDEX_op_ext32s_i64:
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return (int32_t)x;
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case INDEX_op_extu_i32_i64:
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case INDEX_op_extrl_i64_i32:
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case INDEX_op_ext32u_i64:
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return (uint32_t)x;
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case INDEX_op_extrh_i64_i32:
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return (uint64_t)x >> 32;
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case INDEX_op_muluh_i32:
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return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
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case INDEX_op_mulsh_i32:
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return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
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case INDEX_op_muluh_i64:
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mulu64(&l64, &h64, x, y);
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return h64;
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case INDEX_op_mulsh_i64:
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muls64(&l64, &h64, x, y);
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return h64;
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case INDEX_op_div_i32:
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/* Avoid crashing on divide by zero, otherwise undefined. */
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return (int32_t)x / ((int32_t)y ? : 1);
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case INDEX_op_divu_i32:
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return (uint32_t)x / ((uint32_t)y ? : 1);
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case INDEX_op_div_i64:
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return (int64_t)x / ((int64_t)y ? : 1);
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case INDEX_op_divu_i64:
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return (uint64_t)x / ((uint64_t)y ? : 1);
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case INDEX_op_rem_i32:
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return (int32_t)x % ((int32_t)y ? : 1);
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case INDEX_op_remu_i32:
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return (uint32_t)x % ((uint32_t)y ? : 1);
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case INDEX_op_rem_i64:
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return (int64_t)x % ((int64_t)y ? : 1);
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case INDEX_op_remu_i64:
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return (uint64_t)x % ((uint64_t)y ? : 1);
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default:
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fprintf(stderr,
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"Unrecognized operation %d in do_constant_folding.\n", op);
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tcg_abort();
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}
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}
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static uint64_t do_constant_folding(TCGOpcode op, TCGType type,
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uint64_t x, uint64_t y)
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{
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uint64_t res = do_constant_folding_2(op, x, y);
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if (type == TCG_TYPE_I32) {
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res = (int32_t)res;
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}
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return res;
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}
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static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
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{
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switch (c) {
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case TCG_COND_EQ:
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return x == y;
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case TCG_COND_NE:
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return x != y;
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case TCG_COND_LT:
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return (int32_t)x < (int32_t)y;
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case TCG_COND_GE:
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return (int32_t)x >= (int32_t)y;
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case TCG_COND_LE:
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return (int32_t)x <= (int32_t)y;
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case TCG_COND_GT:
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return (int32_t)x > (int32_t)y;
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case TCG_COND_LTU:
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return x < y;
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case TCG_COND_GEU:
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return x >= y;
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case TCG_COND_LEU:
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return x <= y;
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case TCG_COND_GTU:
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return x > y;
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default:
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tcg_abort();
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}
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}
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static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
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{
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switch (c) {
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case TCG_COND_EQ:
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return x == y;
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case TCG_COND_NE:
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return x != y;
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case TCG_COND_LT:
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return (int64_t)x < (int64_t)y;
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case TCG_COND_GE:
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return (int64_t)x >= (int64_t)y;
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case TCG_COND_LE:
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return (int64_t)x <= (int64_t)y;
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case TCG_COND_GT:
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return (int64_t)x > (int64_t)y;
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case TCG_COND_LTU:
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return x < y;
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case TCG_COND_GEU:
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return x >= y;
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case TCG_COND_LEU:
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return x <= y;
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case TCG_COND_GTU:
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return x > y;
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default:
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tcg_abort();
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}
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}
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|
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static bool do_constant_folding_cond_eq(TCGCond c)
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{
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switch (c) {
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case TCG_COND_GT:
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case TCG_COND_LTU:
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case TCG_COND_LT:
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case TCG_COND_GTU:
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case TCG_COND_NE:
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return 0;
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case TCG_COND_GE:
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case TCG_COND_GEU:
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case TCG_COND_LE:
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case TCG_COND_LEU:
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case TCG_COND_EQ:
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return 1;
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default:
|
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tcg_abort();
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}
|
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}
|
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|
|
/*
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* Return -1 if the condition can't be simplified,
|
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* and the result of the condition (0 or 1) if it can.
|
|
*/
|
|
static int do_constant_folding_cond(TCGType type, TCGArg x,
|
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TCGArg y, TCGCond c)
|
|
{
|
|
uint64_t xv = arg_info(x)->val;
|
|
uint64_t yv = arg_info(y)->val;
|
|
|
|
if (arg_is_const(x) && arg_is_const(y)) {
|
|
switch (type) {
|
|
case TCG_TYPE_I32:
|
|
return do_constant_folding_cond_32(xv, yv, c);
|
|
case TCG_TYPE_I64:
|
|
return do_constant_folding_cond_64(xv, yv, c);
|
|
default:
|
|
/* Only scalar comparisons are optimizable */
|
|
return -1;
|
|
}
|
|
} else if (args_are_copies(x, y)) {
|
|
return do_constant_folding_cond_eq(c);
|
|
} else if (arg_is_const(y) && yv == 0) {
|
|
switch (c) {
|
|
case TCG_COND_LTU:
|
|
return 0;
|
|
case TCG_COND_GEU:
|
|
return 1;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Return -1 if the condition can't be simplified,
|
|
* and the result of the condition (0 or 1) if it can.
|
|
*/
|
|
static int do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
|
|
{
|
|
TCGArg al = p1[0], ah = p1[1];
|
|
TCGArg bl = p2[0], bh = p2[1];
|
|
|
|
if (arg_is_const(bl) && arg_is_const(bh)) {
|
|
tcg_target_ulong blv = arg_info(bl)->val;
|
|
tcg_target_ulong bhv = arg_info(bh)->val;
|
|
uint64_t b = deposit64(blv, 32, 32, bhv);
|
|
|
|
if (arg_is_const(al) && arg_is_const(ah)) {
|
|
tcg_target_ulong alv = arg_info(al)->val;
|
|
tcg_target_ulong ahv = arg_info(ah)->val;
|
|
uint64_t a = deposit64(alv, 32, 32, ahv);
|
|
return do_constant_folding_cond_64(a, b, c);
|
|
}
|
|
if (b == 0) {
|
|
switch (c) {
|
|
case TCG_COND_LTU:
|
|
return 0;
|
|
case TCG_COND_GEU:
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
|
|
return do_constant_folding_cond_eq(c);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
|
|
{
|
|
TCGArg a1 = *p1, a2 = *p2;
|
|
int sum = 0;
|
|
sum += arg_is_const(a1);
|
|
sum -= arg_is_const(a2);
|
|
|
|
/* Prefer the constant in second argument, and then the form
|
|
op a, a, b, which is better handled on non-RISC hosts. */
|
|
if (sum > 0 || (sum == 0 && dest == a2)) {
|
|
*p1 = a2;
|
|
*p2 = a1;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
|
|
{
|
|
int sum = 0;
|
|
sum += arg_is_const(p1[0]);
|
|
sum += arg_is_const(p1[1]);
|
|
sum -= arg_is_const(p2[0]);
|
|
sum -= arg_is_const(p2[1]);
|
|
if (sum > 0) {
|
|
TCGArg t;
|
|
t = p1[0], p1[0] = p2[0], p2[0] = t;
|
|
t = p1[1], p1[1] = p2[1], p2[1] = t;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void init_arguments(OptContext *ctx, TCGOp *op, int nb_args)
|
|
{
|
|
for (int i = 0; i < nb_args; i++) {
|
|
TCGTemp *ts = arg_temp(op->args[i]);
|
|
if (ts) {
|
|
init_ts_info(ctx, ts);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void copy_propagate(OptContext *ctx, TCGOp *op,
|
|
int nb_oargs, int nb_iargs)
|
|
{
|
|
TCGContext *s = ctx->tcg;
|
|
|
|
for (int i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
TCGTemp *ts = arg_temp(op->args[i]);
|
|
if (ts && ts_is_copy(ts)) {
|
|
op->args[i] = temp_arg(find_better_copy(s, ts));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void finish_folding(OptContext *ctx, TCGOp *op)
|
|
{
|
|
const TCGOpDef *def = &tcg_op_defs[op->opc];
|
|
int i, nb_oargs;
|
|
|
|
/*
|
|
* For an opcode that ends a BB, reset all temp data.
|
|
* We do no cross-BB optimization.
|
|
*/
|
|
if (def->flags & TCG_OPF_BB_END) {
|
|
memset(&ctx->temps_used, 0, sizeof(ctx->temps_used));
|
|
ctx->prev_mb = NULL;
|
|
return;
|
|
}
|
|
|
|
nb_oargs = def->nb_oargs;
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
reset_temp(op->args[i]);
|
|
/*
|
|
* Save the corresponding known-zero bits mask for the
|
|
* first output argument (only one supported so far).
|
|
*/
|
|
if (i == 0) {
|
|
arg_info(op->args[i])->z_mask = ctx->z_mask;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The fold_* functions return true when processing is complete,
|
|
* usually by folding the operation to a constant or to a copy,
|
|
* and calling tcg_opt_gen_{mov,movi}. They may do other things,
|
|
* like collect information about the value produced, for use in
|
|
* optimizing a subsequent operation.
|
|
*
|
|
* These first fold_* functions are all helpers, used by other
|
|
* folders for more specific operations.
|
|
*/
|
|
|
|
static bool fold_const1(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t;
|
|
|
|
t = arg_info(op->args[1])->val;
|
|
t = do_constant_folding(op->opc, ctx->type, t, 0);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_const2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
uint64_t t1 = arg_info(op->args[1])->val;
|
|
uint64_t t2 = arg_info(op->args[2])->val;
|
|
|
|
t1 = do_constant_folding(op->opc, ctx->type, t1, t2);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_masks(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t a_mask = ctx->a_mask;
|
|
uint64_t z_mask = ctx->z_mask;
|
|
|
|
/*
|
|
* 32-bit ops generate 32-bit results. For the result is zero test
|
|
* below, we can ignore high bits, but for further optimizations we
|
|
* need to record that the high bits contain garbage.
|
|
*/
|
|
if (ctx->type == TCG_TYPE_I32) {
|
|
ctx->z_mask |= MAKE_64BIT_MASK(32, 32);
|
|
a_mask &= MAKE_64BIT_MASK(0, 32);
|
|
z_mask &= MAKE_64BIT_MASK(0, 32);
|
|
}
|
|
|
|
if (z_mask == 0) {
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], 0);
|
|
}
|
|
if (a_mask == 0) {
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Convert @op to NOT, if NOT is supported by the host.
|
|
* Return true f the conversion is successful, which will still
|
|
* indicate that the processing is complete.
|
|
*/
|
|
static bool fold_not(OptContext *ctx, TCGOp *op);
|
|
static bool fold_to_not(OptContext *ctx, TCGOp *op, int idx)
|
|
{
|
|
TCGOpcode not_op;
|
|
bool have_not;
|
|
|
|
switch (ctx->type) {
|
|
case TCG_TYPE_I32:
|
|
not_op = INDEX_op_not_i32;
|
|
have_not = TCG_TARGET_HAS_not_i32;
|
|
break;
|
|
case TCG_TYPE_I64:
|
|
not_op = INDEX_op_not_i64;
|
|
have_not = TCG_TARGET_HAS_not_i64;
|
|
break;
|
|
case TCG_TYPE_V64:
|
|
case TCG_TYPE_V128:
|
|
case TCG_TYPE_V256:
|
|
not_op = INDEX_op_not_vec;
|
|
have_not = TCG_TARGET_HAS_not_vec;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
if (have_not) {
|
|
op->opc = not_op;
|
|
op->args[1] = op->args[idx];
|
|
return fold_not(ctx, op);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has first argument @i, fold to @i. */
|
|
static bool fold_ix_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_info(op->args[1])->val == i) {
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has first argument @i, fold to NOT. */
|
|
static bool fold_ix_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_info(op->args[1])->val == i) {
|
|
return fold_to_not(ctx, op, 2);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has second argument @i, fold to @i. */
|
|
static bool fold_xi_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (arg_is_const(op->args[2]) && arg_info(op->args[2])->val == i) {
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has second argument @i, fold to identity. */
|
|
static bool fold_xi_to_x(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (arg_is_const(op->args[2]) && arg_info(op->args[2])->val == i) {
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has second argument @i, fold to NOT. */
|
|
static bool fold_xi_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (arg_is_const(op->args[2]) && arg_info(op->args[2])->val == i) {
|
|
return fold_to_not(ctx, op, 1);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has both arguments equal, fold to @i. */
|
|
static bool fold_xx_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
|
|
{
|
|
if (args_are_copies(op->args[1], op->args[2])) {
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* If the binary operation has both arguments equal, fold to identity. */
|
|
static bool fold_xx_to_x(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (args_are_copies(op->args[1], op->args[2])) {
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* These outermost fold_<op> functions are sorted alphabetically.
|
|
*
|
|
* The ordering of the transformations should be:
|
|
* 1) those that produce a constant
|
|
* 2) those that produce a copy
|
|
* 3) those that produce information about the result value.
|
|
*/
|
|
|
|
static bool fold_add(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_x(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_addsub2(OptContext *ctx, TCGOp *op, bool add)
|
|
{
|
|
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3]) &&
|
|
arg_is_const(op->args[4]) && arg_is_const(op->args[5])) {
|
|
uint64_t al = arg_info(op->args[2])->val;
|
|
uint64_t ah = arg_info(op->args[3])->val;
|
|
uint64_t bl = arg_info(op->args[4])->val;
|
|
uint64_t bh = arg_info(op->args[5])->val;
|
|
TCGArg rl, rh;
|
|
TCGOp *op2;
|
|
|
|
if (ctx->type == TCG_TYPE_I32) {
|
|
uint64_t a = deposit64(al, 32, 32, ah);
|
|
uint64_t b = deposit64(bl, 32, 32, bh);
|
|
|
|
if (add) {
|
|
a += b;
|
|
} else {
|
|
a -= b;
|
|
}
|
|
|
|
al = sextract64(a, 0, 32);
|
|
ah = sextract64(a, 32, 32);
|
|
} else {
|
|
Int128 a = int128_make128(al, ah);
|
|
Int128 b = int128_make128(bl, bh);
|
|
|
|
if (add) {
|
|
a = int128_add(a, b);
|
|
} else {
|
|
a = int128_sub(a, b);
|
|
}
|
|
|
|
al = int128_getlo(a);
|
|
ah = int128_gethi(a);
|
|
}
|
|
|
|
rl = op->args[0];
|
|
rh = op->args[1];
|
|
|
|
/* The proper opcode is supplied by tcg_opt_gen_mov. */
|
|
op2 = tcg_op_insert_before(ctx->tcg, op, 0);
|
|
|
|
tcg_opt_gen_movi(ctx, op, rl, al);
|
|
tcg_opt_gen_movi(ctx, op2, rh, ah);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_add2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
return fold_addsub2(ctx, op, true);
|
|
}
|
|
|
|
static bool fold_and(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z1, z2;
|
|
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_i(ctx, op, 0) ||
|
|
fold_xi_to_x(ctx, op, -1) ||
|
|
fold_xx_to_x(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
z1 = arg_info(op->args[1])->z_mask;
|
|
z2 = arg_info(op->args[2])->z_mask;
|
|
ctx->z_mask = z1 & z2;
|
|
|
|
/*
|
|
* Known-zeros does not imply known-ones. Therefore unless
|
|
* arg2 is constant, we can't infer affected bits from it.
|
|
*/
|
|
if (arg_is_const(op->args[2])) {
|
|
ctx->a_mask = z1 & ~z2;
|
|
}
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_andc(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z1;
|
|
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xx_to_i(ctx, op, 0) ||
|
|
fold_xi_to_x(ctx, op, 0) ||
|
|
fold_ix_to_not(ctx, op, -1)) {
|
|
return true;
|
|
}
|
|
|
|
z1 = arg_info(op->args[1])->z_mask;
|
|
|
|
/*
|
|
* Known-zeros does not imply known-ones. Therefore unless
|
|
* arg2 is constant, we can't infer anything from it.
|
|
*/
|
|
if (arg_is_const(op->args[2])) {
|
|
uint64_t z2 = ~arg_info(op->args[2])->z_mask;
|
|
ctx->a_mask = z1 & ~z2;
|
|
z1 &= z2;
|
|
}
|
|
ctx->z_mask = z1;
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_brcond(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGCond cond = op->args[2];
|
|
int i = do_constant_folding_cond(ctx->type, op->args[0], op->args[1], cond);
|
|
|
|
if (i == 0) {
|
|
tcg_op_remove(ctx->tcg, op);
|
|
return true;
|
|
}
|
|
if (i > 0) {
|
|
op->opc = INDEX_op_br;
|
|
op->args[0] = op->args[3];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_brcond2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGCond cond = op->args[4];
|
|
int i = do_constant_folding_cond2(&op->args[0], &op->args[2], cond);
|
|
TCGArg label = op->args[5];
|
|
int inv = 0;
|
|
|
|
if (i >= 0) {
|
|
goto do_brcond_const;
|
|
}
|
|
|
|
switch (cond) {
|
|
case TCG_COND_LT:
|
|
case TCG_COND_GE:
|
|
/*
|
|
* Simplify LT/GE comparisons vs zero to a single compare
|
|
* vs the high word of the input.
|
|
*/
|
|
if (arg_is_const(op->args[2]) && arg_info(op->args[2])->val == 0 &&
|
|
arg_is_const(op->args[3]) && arg_info(op->args[3])->val == 0) {
|
|
goto do_brcond_high;
|
|
}
|
|
break;
|
|
|
|
case TCG_COND_NE:
|
|
inv = 1;
|
|
QEMU_FALLTHROUGH;
|
|
case TCG_COND_EQ:
|
|
/*
|
|
* Simplify EQ/NE comparisons where one of the pairs
|
|
* can be simplified.
|
|
*/
|
|
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[0],
|
|
op->args[2], cond);
|
|
switch (i ^ inv) {
|
|
case 0:
|
|
goto do_brcond_const;
|
|
case 1:
|
|
goto do_brcond_high;
|
|
}
|
|
|
|
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1],
|
|
op->args[3], cond);
|
|
switch (i ^ inv) {
|
|
case 0:
|
|
goto do_brcond_const;
|
|
case 1:
|
|
op->opc = INDEX_op_brcond_i32;
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = cond;
|
|
op->args[3] = label;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
|
|
do_brcond_high:
|
|
op->opc = INDEX_op_brcond_i32;
|
|
op->args[0] = op->args[1];
|
|
op->args[1] = op->args[3];
|
|
op->args[2] = cond;
|
|
op->args[3] = label;
|
|
break;
|
|
|
|
do_brcond_const:
|
|
if (i == 0) {
|
|
tcg_op_remove(ctx->tcg, op);
|
|
return true;
|
|
}
|
|
op->opc = INDEX_op_br;
|
|
op->args[0] = label;
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_bswap(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask, sign;
|
|
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t = arg_info(op->args[1])->val;
|
|
|
|
t = do_constant_folding(op->opc, ctx->type, t, op->args[2]);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
|
|
z_mask = arg_info(op->args[1])->z_mask;
|
|
switch (op->opc) {
|
|
case INDEX_op_bswap16_i32:
|
|
case INDEX_op_bswap16_i64:
|
|
z_mask = bswap16(z_mask);
|
|
sign = INT16_MIN;
|
|
break;
|
|
case INDEX_op_bswap32_i32:
|
|
case INDEX_op_bswap32_i64:
|
|
z_mask = bswap32(z_mask);
|
|
sign = INT32_MIN;
|
|
break;
|
|
case INDEX_op_bswap64_i64:
|
|
z_mask = bswap64(z_mask);
|
|
sign = INT64_MIN;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
|
|
case TCG_BSWAP_OZ:
|
|
break;
|
|
case TCG_BSWAP_OS:
|
|
/* If the sign bit may be 1, force all the bits above to 1. */
|
|
if (z_mask & sign) {
|
|
z_mask |= sign;
|
|
}
|
|
break;
|
|
default:
|
|
/* The high bits are undefined: force all bits above the sign to 1. */
|
|
z_mask |= sign << 1;
|
|
break;
|
|
}
|
|
ctx->z_mask = z_mask;
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_call(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGContext *s = ctx->tcg;
|
|
int nb_oargs = TCGOP_CALLO(op);
|
|
int nb_iargs = TCGOP_CALLI(op);
|
|
int flags, i;
|
|
|
|
init_arguments(ctx, op, nb_oargs + nb_iargs);
|
|
copy_propagate(ctx, op, nb_oargs, nb_iargs);
|
|
|
|
/* If the function reads or writes globals, reset temp data. */
|
|
flags = tcg_call_flags(op);
|
|
if (!(flags & (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
|
|
int nb_globals = s->nb_globals;
|
|
|
|
for (i = 0; i < nb_globals; i++) {
|
|
if (test_bit(i, ctx->temps_used.l)) {
|
|
reset_ts(&ctx->tcg->temps[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Reset temp data for outputs. */
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
reset_temp(op->args[i]);
|
|
}
|
|
|
|
/* Stop optimizing MB across calls. */
|
|
ctx->prev_mb = NULL;
|
|
return true;
|
|
}
|
|
|
|
static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask;
|
|
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t = arg_info(op->args[1])->val;
|
|
|
|
if (t != 0) {
|
|
t = do_constant_folding(op->opc, ctx->type, t, 0);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
|
|
}
|
|
|
|
switch (ctx->type) {
|
|
case TCG_TYPE_I32:
|
|
z_mask = 31;
|
|
break;
|
|
case TCG_TYPE_I64:
|
|
z_mask = 63;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool fold_ctpop(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const1(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
switch (ctx->type) {
|
|
case TCG_TYPE_I32:
|
|
ctx->z_mask = 32 | 31;
|
|
break;
|
|
case TCG_TYPE_I64:
|
|
ctx->z_mask = 64 | 63;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_deposit(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
uint64_t t1 = arg_info(op->args[1])->val;
|
|
uint64_t t2 = arg_info(op->args[2])->val;
|
|
|
|
t1 = deposit64(t1, op->args[3], op->args[4], t2);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
|
|
}
|
|
|
|
ctx->z_mask = deposit64(arg_info(op->args[1])->z_mask,
|
|
op->args[3], op->args[4],
|
|
arg_info(op->args[2])->z_mask);
|
|
return false;
|
|
}
|
|
|
|
static bool fold_divide(OptContext *ctx, TCGOp *op)
|
|
{
|
|
return fold_const2(ctx, op);
|
|
}
|
|
|
|
static bool fold_dup(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t = arg_info(op->args[1])->val;
|
|
t = dup_const(TCGOP_VECE(op), t);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_dup2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
uint64_t t = deposit64(arg_info(op->args[1])->val, 32, 32,
|
|
arg_info(op->args[2])->val);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
|
|
if (args_are_copies(op->args[1], op->args[2])) {
|
|
op->opc = INDEX_op_dup_vec;
|
|
TCGOP_VECE(op) = MO_32;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_eqv(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_x(ctx, op, -1) ||
|
|
fold_xi_to_not(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_extract(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask_old, z_mask;
|
|
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t;
|
|
|
|
t = arg_info(op->args[1])->val;
|
|
t = extract64(t, op->args[2], op->args[3]);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
|
|
z_mask_old = arg_info(op->args[1])->z_mask;
|
|
z_mask = extract64(z_mask_old, op->args[2], op->args[3]);
|
|
if (op->args[2] == 0) {
|
|
ctx->a_mask = z_mask_old ^ z_mask;
|
|
}
|
|
ctx->z_mask = z_mask;
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_extract2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
uint64_t v1 = arg_info(op->args[1])->val;
|
|
uint64_t v2 = arg_info(op->args[2])->val;
|
|
int shr = op->args[3];
|
|
|
|
if (op->opc == INDEX_op_extract2_i64) {
|
|
v1 >>= shr;
|
|
v2 <<= 64 - shr;
|
|
} else {
|
|
v1 = (uint32_t)v1 >> shr;
|
|
v2 = (int32_t)v2 << (32 - shr);
|
|
}
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], v1 | v2);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_exts(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask_old, z_mask, sign;
|
|
bool type_change = false;
|
|
|
|
if (fold_const1(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
z_mask_old = z_mask = arg_info(op->args[1])->z_mask;
|
|
|
|
switch (op->opc) {
|
|
CASE_OP_32_64(ext8s):
|
|
sign = INT8_MIN;
|
|
z_mask = (uint8_t)z_mask;
|
|
break;
|
|
CASE_OP_32_64(ext16s):
|
|
sign = INT16_MIN;
|
|
z_mask = (uint16_t)z_mask;
|
|
break;
|
|
case INDEX_op_ext_i32_i64:
|
|
type_change = true;
|
|
QEMU_FALLTHROUGH;
|
|
case INDEX_op_ext32s_i64:
|
|
sign = INT32_MIN;
|
|
z_mask = (uint32_t)z_mask;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
if (z_mask & sign) {
|
|
z_mask |= sign;
|
|
} else if (!type_change) {
|
|
ctx->a_mask = z_mask_old ^ z_mask;
|
|
}
|
|
ctx->z_mask = z_mask;
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_extu(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask_old, z_mask;
|
|
bool type_change = false;
|
|
|
|
if (fold_const1(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
z_mask_old = z_mask = arg_info(op->args[1])->z_mask;
|
|
|
|
switch (op->opc) {
|
|
CASE_OP_32_64(ext8u):
|
|
z_mask = (uint8_t)z_mask;
|
|
break;
|
|
CASE_OP_32_64(ext16u):
|
|
z_mask = (uint16_t)z_mask;
|
|
break;
|
|
case INDEX_op_extrl_i64_i32:
|
|
case INDEX_op_extu_i32_i64:
|
|
type_change = true;
|
|
QEMU_FALLTHROUGH;
|
|
case INDEX_op_ext32u_i64:
|
|
z_mask = (uint32_t)z_mask;
|
|
break;
|
|
case INDEX_op_extrh_i64_i32:
|
|
type_change = true;
|
|
z_mask >>= 32;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
ctx->z_mask = z_mask;
|
|
if (!type_change) {
|
|
ctx->a_mask = z_mask_old ^ z_mask;
|
|
}
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_mb(OptContext *ctx, TCGOp *op)
|
|
{
|
|
/* Eliminate duplicate and redundant fence instructions. */
|
|
if (ctx->prev_mb) {
|
|
/*
|
|
* Merge two barriers of the same type into one,
|
|
* or a weaker barrier into a stronger one,
|
|
* or two weaker barriers into a stronger one.
|
|
* mb X; mb Y => mb X|Y
|
|
* mb; strl => mb; st
|
|
* ldaq; mb => ld; mb
|
|
* ldaq; strl => ld; mb; st
|
|
* Other combinations are also merged into a strong
|
|
* barrier. This is stricter than specified but for
|
|
* the purposes of TCG is better than not optimizing.
|
|
*/
|
|
ctx->prev_mb->args[0] |= op->args[0];
|
|
tcg_op_remove(ctx->tcg, op);
|
|
} else {
|
|
ctx->prev_mb = op;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool fold_mov(OptContext *ctx, TCGOp *op)
|
|
{
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
|
|
}
|
|
|
|
static bool fold_movcond(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGCond cond = op->args[5];
|
|
int i = do_constant_folding_cond(ctx->type, op->args[1], op->args[2], cond);
|
|
|
|
if (i >= 0) {
|
|
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[4 - i]);
|
|
}
|
|
|
|
ctx->z_mask = arg_info(op->args[3])->z_mask
|
|
| arg_info(op->args[4])->z_mask;
|
|
|
|
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
|
|
uint64_t tv = arg_info(op->args[3])->val;
|
|
uint64_t fv = arg_info(op->args[4])->val;
|
|
TCGOpcode opc;
|
|
|
|
switch (ctx->type) {
|
|
case TCG_TYPE_I32:
|
|
opc = INDEX_op_setcond_i32;
|
|
break;
|
|
case TCG_TYPE_I64:
|
|
opc = INDEX_op_setcond_i64;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
if (tv == 1 && fv == 0) {
|
|
op->opc = opc;
|
|
op->args[3] = cond;
|
|
} else if (fv == 1 && tv == 0) {
|
|
op->opc = opc;
|
|
op->args[3] = tcg_invert_cond(cond);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_mul(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_i(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_mul_highpart(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_i(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_multiply2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
|
|
uint64_t a = arg_info(op->args[2])->val;
|
|
uint64_t b = arg_info(op->args[3])->val;
|
|
uint64_t h, l;
|
|
TCGArg rl, rh;
|
|
TCGOp *op2;
|
|
|
|
switch (op->opc) {
|
|
case INDEX_op_mulu2_i32:
|
|
l = (uint64_t)(uint32_t)a * (uint32_t)b;
|
|
h = (int32_t)(l >> 32);
|
|
l = (int32_t)l;
|
|
break;
|
|
case INDEX_op_muls2_i32:
|
|
l = (int64_t)(int32_t)a * (int32_t)b;
|
|
h = l >> 32;
|
|
l = (int32_t)l;
|
|
break;
|
|
case INDEX_op_mulu2_i64:
|
|
mulu64(&l, &h, a, b);
|
|
break;
|
|
case INDEX_op_muls2_i64:
|
|
muls64(&l, &h, a, b);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
rl = op->args[0];
|
|
rh = op->args[1];
|
|
|
|
/* The proper opcode is supplied by tcg_opt_gen_mov. */
|
|
op2 = tcg_op_insert_before(ctx->tcg, op, 0);
|
|
|
|
tcg_opt_gen_movi(ctx, op, rl, l);
|
|
tcg_opt_gen_movi(ctx, op2, rh, h);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_nand(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_not(ctx, op, -1)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_neg(OptContext *ctx, TCGOp *op)
|
|
{
|
|
uint64_t z_mask;
|
|
|
|
if (fold_const1(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
/* Set to 1 all bits to the left of the rightmost. */
|
|
z_mask = arg_info(op->args[1])->z_mask;
|
|
ctx->z_mask = -(z_mask & -z_mask);
|
|
|
|
/*
|
|
* Because of fold_sub_to_neg, we want to always return true,
|
|
* via finish_folding.
|
|
*/
|
|
finish_folding(ctx, op);
|
|
return true;
|
|
}
|
|
|
|
static bool fold_nor(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_not(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_not(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const1(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
/* Because of fold_to_not, we want to always return true, via finish. */
|
|
finish_folding(ctx, op);
|
|
return true;
|
|
}
|
|
|
|
static bool fold_or(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_x(ctx, op, 0) ||
|
|
fold_xx_to_x(ctx, op)) {
|
|
return true;
|
|
}
|
|
|
|
ctx->z_mask = arg_info(op->args[1])->z_mask
|
|
| arg_info(op->args[2])->z_mask;
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_orc(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xi_to_x(ctx, op, -1) ||
|
|
fold_ix_to_not(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_qemu_ld(OptContext *ctx, TCGOp *op)
|
|
{
|
|
const TCGOpDef *def = &tcg_op_defs[op->opc];
|
|
MemOpIdx oi = op->args[def->nb_oargs + def->nb_iargs];
|
|
MemOp mop = get_memop(oi);
|
|
int width = 8 * memop_size(mop);
|
|
|
|
if (!(mop & MO_SIGN) && width < 64) {
|
|
ctx->z_mask = MAKE_64BIT_MASK(0, width);
|
|
}
|
|
|
|
/* Opcodes that touch guest memory stop the mb optimization. */
|
|
ctx->prev_mb = NULL;
|
|
return false;
|
|
}
|
|
|
|
static bool fold_qemu_st(OptContext *ctx, TCGOp *op)
|
|
{
|
|
/* Opcodes that touch guest memory stop the mb optimization. */
|
|
ctx->prev_mb = NULL;
|
|
return false;
|
|
}
|
|
|
|
static bool fold_remainder(OptContext *ctx, TCGOp *op)
|
|
{
|
|
return fold_const2(ctx, op);
|
|
}
|
|
|
|
static bool fold_setcond(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGCond cond = op->args[3];
|
|
int i = do_constant_folding_cond(ctx->type, op->args[1], op->args[2], cond);
|
|
|
|
if (i >= 0) {
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
|
|
}
|
|
|
|
ctx->z_mask = 1;
|
|
return false;
|
|
}
|
|
|
|
static bool fold_setcond2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGCond cond = op->args[5];
|
|
int i = do_constant_folding_cond2(&op->args[1], &op->args[3], cond);
|
|
int inv = 0;
|
|
|
|
if (i >= 0) {
|
|
goto do_setcond_const;
|
|
}
|
|
|
|
switch (cond) {
|
|
case TCG_COND_LT:
|
|
case TCG_COND_GE:
|
|
/*
|
|
* Simplify LT/GE comparisons vs zero to a single compare
|
|
* vs the high word of the input.
|
|
*/
|
|
if (arg_is_const(op->args[3]) && arg_info(op->args[3])->val == 0 &&
|
|
arg_is_const(op->args[4]) && arg_info(op->args[4])->val == 0) {
|
|
goto do_setcond_high;
|
|
}
|
|
break;
|
|
|
|
case TCG_COND_NE:
|
|
inv = 1;
|
|
QEMU_FALLTHROUGH;
|
|
case TCG_COND_EQ:
|
|
/*
|
|
* Simplify EQ/NE comparisons where one of the pairs
|
|
* can be simplified.
|
|
*/
|
|
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1],
|
|
op->args[3], cond);
|
|
switch (i ^ inv) {
|
|
case 0:
|
|
goto do_setcond_const;
|
|
case 1:
|
|
goto do_setcond_high;
|
|
}
|
|
|
|
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[2],
|
|
op->args[4], cond);
|
|
switch (i ^ inv) {
|
|
case 0:
|
|
goto do_setcond_const;
|
|
case 1:
|
|
op->args[2] = op->args[3];
|
|
op->args[3] = cond;
|
|
op->opc = INDEX_op_setcond_i32;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
|
|
do_setcond_high:
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[4];
|
|
op->args[3] = cond;
|
|
op->opc = INDEX_op_setcond_i32;
|
|
break;
|
|
}
|
|
|
|
ctx->z_mask = 1;
|
|
return false;
|
|
|
|
do_setcond_const:
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
|
|
}
|
|
|
|
static bool fold_sextract(OptContext *ctx, TCGOp *op)
|
|
{
|
|
int64_t z_mask_old, z_mask;
|
|
|
|
if (arg_is_const(op->args[1])) {
|
|
uint64_t t;
|
|
|
|
t = arg_info(op->args[1])->val;
|
|
t = sextract64(t, op->args[2], op->args[3]);
|
|
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
|
|
}
|
|
|
|
z_mask_old = arg_info(op->args[1])->z_mask;
|
|
z_mask = sextract64(z_mask_old, op->args[2], op->args[3]);
|
|
if (op->args[2] == 0 && z_mask >= 0) {
|
|
ctx->a_mask = z_mask_old ^ z_mask;
|
|
}
|
|
ctx->z_mask = z_mask;
|
|
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
static bool fold_shift(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_ix_to_i(ctx, op, 0) ||
|
|
fold_xi_to_x(ctx, op, 0)) {
|
|
return true;
|
|
}
|
|
|
|
if (arg_is_const(op->args[2])) {
|
|
ctx->z_mask = do_constant_folding(op->opc, ctx->type,
|
|
arg_info(op->args[1])->z_mask,
|
|
arg_info(op->args[2])->val);
|
|
return fold_masks(ctx, op);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_sub_to_neg(OptContext *ctx, TCGOp *op)
|
|
{
|
|
TCGOpcode neg_op;
|
|
bool have_neg;
|
|
|
|
if (!arg_is_const(op->args[1]) || arg_info(op->args[1])->val != 0) {
|
|
return false;
|
|
}
|
|
|
|
switch (ctx->type) {
|
|
case TCG_TYPE_I32:
|
|
neg_op = INDEX_op_neg_i32;
|
|
have_neg = TCG_TARGET_HAS_neg_i32;
|
|
break;
|
|
case TCG_TYPE_I64:
|
|
neg_op = INDEX_op_neg_i64;
|
|
have_neg = TCG_TARGET_HAS_neg_i64;
|
|
break;
|
|
case TCG_TYPE_V64:
|
|
case TCG_TYPE_V128:
|
|
case TCG_TYPE_V256:
|
|
neg_op = INDEX_op_neg_vec;
|
|
have_neg = (TCG_TARGET_HAS_neg_vec &&
|
|
tcg_can_emit_vec_op(neg_op, ctx->type, TCGOP_VECE(op)) > 0);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
if (have_neg) {
|
|
op->opc = neg_op;
|
|
op->args[1] = op->args[2];
|
|
return fold_neg(ctx, op);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_sub(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xx_to_i(ctx, op, 0) ||
|
|
fold_xi_to_x(ctx, op, 0) ||
|
|
fold_sub_to_neg(ctx, op)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_sub2(OptContext *ctx, TCGOp *op)
|
|
{
|
|
return fold_addsub2(ctx, op, false);
|
|
}
|
|
|
|
static bool fold_tcg_ld(OptContext *ctx, TCGOp *op)
|
|
{
|
|
/* We can't do any folding with a load, but we can record bits. */
|
|
switch (op->opc) {
|
|
CASE_OP_32_64(ld8u):
|
|
ctx->z_mask = MAKE_64BIT_MASK(0, 8);
|
|
break;
|
|
CASE_OP_32_64(ld16u):
|
|
ctx->z_mask = MAKE_64BIT_MASK(0, 16);
|
|
break;
|
|
case INDEX_op_ld32u_i64:
|
|
ctx->z_mask = MAKE_64BIT_MASK(0, 32);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fold_xor(OptContext *ctx, TCGOp *op)
|
|
{
|
|
if (fold_const2(ctx, op) ||
|
|
fold_xx_to_i(ctx, op, 0) ||
|
|
fold_xi_to_x(ctx, op, 0) ||
|
|
fold_xi_to_not(ctx, op, -1)) {
|
|
return true;
|
|
}
|
|
|
|
ctx->z_mask = arg_info(op->args[1])->z_mask
|
|
| arg_info(op->args[2])->z_mask;
|
|
return fold_masks(ctx, op);
|
|
}
|
|
|
|
/* Propagate constants and copies, fold constant expressions. */
|
|
void tcg_optimize(TCGContext *s)
|
|
{
|
|
int nb_temps, i;
|
|
TCGOp *op, *op_next;
|
|
OptContext ctx = { .tcg = s };
|
|
|
|
/* Array VALS has an element for each temp.
|
|
If this temp holds a constant then its value is kept in VALS' element.
|
|
If this temp is a copy of other ones then the other copies are
|
|
available through the doubly linked circular list. */
|
|
|
|
nb_temps = s->nb_temps;
|
|
for (i = 0; i < nb_temps; ++i) {
|
|
s->temps[i].state_ptr = NULL;
|
|
}
|
|
|
|
QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
|
|
TCGOpcode opc = op->opc;
|
|
const TCGOpDef *def;
|
|
bool done = false;
|
|
|
|
/* Calls are special. */
|
|
if (opc == INDEX_op_call) {
|
|
fold_call(&ctx, op);
|
|
continue;
|
|
}
|
|
|
|
def = &tcg_op_defs[opc];
|
|
init_arguments(&ctx, op, def->nb_oargs + def->nb_iargs);
|
|
copy_propagate(&ctx, op, def->nb_oargs, def->nb_iargs);
|
|
|
|
/* Pre-compute the type of the operation. */
|
|
if (def->flags & TCG_OPF_VECTOR) {
|
|
ctx.type = TCG_TYPE_V64 + TCGOP_VECL(op);
|
|
} else if (def->flags & TCG_OPF_64BIT) {
|
|
ctx.type = TCG_TYPE_I64;
|
|
} else {
|
|
ctx.type = TCG_TYPE_I32;
|
|
}
|
|
|
|
/* For commutative operations make constant second argument */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(add):
|
|
CASE_OP_32_64_VEC(mul):
|
|
CASE_OP_32_64_VEC(and):
|
|
CASE_OP_32_64_VEC(or):
|
|
CASE_OP_32_64_VEC(xor):
|
|
CASE_OP_32_64(eqv):
|
|
CASE_OP_32_64(nand):
|
|
CASE_OP_32_64(nor):
|
|
CASE_OP_32_64(muluh):
|
|
CASE_OP_32_64(mulsh):
|
|
swap_commutative(op->args[0], &op->args[1], &op->args[2]);
|
|
break;
|
|
CASE_OP_32_64(brcond):
|
|
if (swap_commutative(-1, &op->args[0], &op->args[1])) {
|
|
op->args[2] = tcg_swap_cond(op->args[2]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(setcond):
|
|
if (swap_commutative(op->args[0], &op->args[1], &op->args[2])) {
|
|
op->args[3] = tcg_swap_cond(op->args[3]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(movcond):
|
|
if (swap_commutative(-1, &op->args[1], &op->args[2])) {
|
|
op->args[5] = tcg_swap_cond(op->args[5]);
|
|
}
|
|
/* For movcond, we canonicalize the "false" input reg to match
|
|
the destination reg so that the tcg backend can implement
|
|
a "move if true" operation. */
|
|
if (swap_commutative(op->args[0], &op->args[4], &op->args[3])) {
|
|
op->args[5] = tcg_invert_cond(op->args[5]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(add2):
|
|
swap_commutative(op->args[0], &op->args[2], &op->args[4]);
|
|
swap_commutative(op->args[1], &op->args[3], &op->args[5]);
|
|
break;
|
|
CASE_OP_32_64(mulu2):
|
|
CASE_OP_32_64(muls2):
|
|
swap_commutative(op->args[0], &op->args[2], &op->args[3]);
|
|
break;
|
|
case INDEX_op_brcond2_i32:
|
|
if (swap_commutative2(&op->args[0], &op->args[2])) {
|
|
op->args[4] = tcg_swap_cond(op->args[4]);
|
|
}
|
|
break;
|
|
case INDEX_op_setcond2_i32:
|
|
if (swap_commutative2(&op->args[1], &op->args[3])) {
|
|
op->args[5] = tcg_swap_cond(op->args[5]);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Assume all bits affected, and no bits known zero. */
|
|
ctx.a_mask = -1;
|
|
ctx.z_mask = -1;
|
|
|
|
/*
|
|
* Process each opcode.
|
|
* Sorted alphabetically by opcode as much as possible.
|
|
*/
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(add):
|
|
done = fold_add(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(add2):
|
|
done = fold_add2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(and):
|
|
done = fold_and(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(andc):
|
|
done = fold_andc(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(brcond):
|
|
done = fold_brcond(&ctx, op);
|
|
break;
|
|
case INDEX_op_brcond2_i32:
|
|
done = fold_brcond2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(bswap16):
|
|
CASE_OP_32_64(bswap32):
|
|
case INDEX_op_bswap64_i64:
|
|
done = fold_bswap(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(clz):
|
|
CASE_OP_32_64(ctz):
|
|
done = fold_count_zeros(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(ctpop):
|
|
done = fold_ctpop(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(deposit):
|
|
done = fold_deposit(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(div):
|
|
CASE_OP_32_64(divu):
|
|
done = fold_divide(&ctx, op);
|
|
break;
|
|
case INDEX_op_dup_vec:
|
|
done = fold_dup(&ctx, op);
|
|
break;
|
|
case INDEX_op_dup2_vec:
|
|
done = fold_dup2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(eqv):
|
|
done = fold_eqv(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(extract):
|
|
done = fold_extract(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(extract2):
|
|
done = fold_extract2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(ext8s):
|
|
CASE_OP_32_64(ext16s):
|
|
case INDEX_op_ext32s_i64:
|
|
case INDEX_op_ext_i32_i64:
|
|
done = fold_exts(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(ext8u):
|
|
CASE_OP_32_64(ext16u):
|
|
case INDEX_op_ext32u_i64:
|
|
case INDEX_op_extu_i32_i64:
|
|
case INDEX_op_extrl_i64_i32:
|
|
case INDEX_op_extrh_i64_i32:
|
|
done = fold_extu(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(ld8u):
|
|
CASE_OP_32_64(ld16u):
|
|
case INDEX_op_ld32u_i64:
|
|
done = fold_tcg_ld(&ctx, op);
|
|
break;
|
|
case INDEX_op_mb:
|
|
done = fold_mb(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(mov):
|
|
done = fold_mov(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(movcond):
|
|
done = fold_movcond(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(mul):
|
|
done = fold_mul(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(mulsh):
|
|
CASE_OP_32_64(muluh):
|
|
done = fold_mul_highpart(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(muls2):
|
|
CASE_OP_32_64(mulu2):
|
|
done = fold_multiply2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(nand):
|
|
done = fold_nand(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(neg):
|
|
done = fold_neg(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(nor):
|
|
done = fold_nor(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(not):
|
|
done = fold_not(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(or):
|
|
done = fold_or(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(orc):
|
|
done = fold_orc(&ctx, op);
|
|
break;
|
|
case INDEX_op_qemu_ld_i32:
|
|
case INDEX_op_qemu_ld_i64:
|
|
done = fold_qemu_ld(&ctx, op);
|
|
break;
|
|
case INDEX_op_qemu_st_i32:
|
|
case INDEX_op_qemu_st8_i32:
|
|
case INDEX_op_qemu_st_i64:
|
|
done = fold_qemu_st(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(rem):
|
|
CASE_OP_32_64(remu):
|
|
done = fold_remainder(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
done = fold_shift(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(setcond):
|
|
done = fold_setcond(&ctx, op);
|
|
break;
|
|
case INDEX_op_setcond2_i32:
|
|
done = fold_setcond2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(sextract):
|
|
done = fold_sextract(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(sub):
|
|
done = fold_sub(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64(sub2):
|
|
done = fold_sub2(&ctx, op);
|
|
break;
|
|
CASE_OP_32_64_VEC(xor):
|
|
done = fold_xor(&ctx, op);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!done) {
|
|
finish_folding(&ctx, op);
|
|
}
|
|
}
|
|
}
|