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2cfac7fa48
qemu-e2k/tcg/optimize.c
Richard Henderson 2cfac7fa48 tcg/optimize: Split out fold_mov 
This is the final entry in the main switch that was in a
different form.  After this, we have the option to convert
the switch into a function dispatch table.

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-10-27 17:11:22 -07:00

1911 lines
52 KiB
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/*
* Optimizations for Tiny Code Generator for QEMU
*
* Copyright (c) 2010 Samsung Electronics.
* Contributed by Kirill Batuzov <batuzovk@ispras.ru>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "tcg/tcg-op.h"
#include "tcg-internal.h"
#define CASE_OP_32_64(x) \
glue(glue(case INDEX_op_, x), _i32): \
glue(glue(case INDEX_op_, x), _i64)
#define CASE_OP_32_64_VEC(x) \
glue(glue(case INDEX_op_, x), _i32): \
glue(glue(case INDEX_op_, x), _i64): \
glue(glue(case INDEX_op_, x), _vec)
typedef struct TempOptInfo {
bool is_const;
TCGTemp *prev_copy;
TCGTemp *next_copy;
uint64_t val;
uint64_t z_mask; /* mask bit is 0 if and only if value bit is 0 */
} TempOptInfo;
typedef struct OptContext {
TCGContext *tcg;
TCGOp *prev_mb;
TCGTempSet temps_used;
/* In flight values from optimization. */
uint64_t z_mask;
} OptContext;
static inline TempOptInfo *ts_info(TCGTemp *ts)
{
return ts->state_ptr;
}
static inline TempOptInfo *arg_info(TCGArg arg)
{
return ts_info(arg_temp(arg));
}
static inline bool ts_is_const(TCGTemp *ts)
{
return ts_info(ts)->is_const;
}
static inline bool arg_is_const(TCGArg arg)
{
return ts_is_const(arg_temp(arg));
}
static inline bool ts_is_copy(TCGTemp *ts)
{
return ts_info(ts)->next_copy != ts;
}
/* Reset TEMP's state, possibly removing the temp for the list of copies. */
static void reset_ts(TCGTemp *ts)
{
TempOptInfo *ti = ts_info(ts);
TempOptInfo *pi = ts_info(ti->prev_copy);
TempOptInfo *ni = ts_info(ti->next_copy);
ni->prev_copy = ti->prev_copy;
pi->next_copy = ti->next_copy;
ti->next_copy = ts;
ti->prev_copy = ts;
ti->is_const = false;
ti->z_mask = -1;
}
static void reset_temp(TCGArg arg)
{
reset_ts(arg_temp(arg));
}
/* Initialize and activate a temporary. */
static void init_ts_info(OptContext *ctx, TCGTemp *ts)
{
size_t idx = temp_idx(ts);
TempOptInfo *ti;
if (test_bit(idx, ctx->temps_used.l)) {
return;
}
set_bit(idx, ctx->temps_used.l);
ti = ts->state_ptr;
if (ti == NULL) {
ti = tcg_malloc(sizeof(TempOptInfo));
ts->state_ptr = ti;
}
ti->next_copy = ts;
ti->prev_copy = ts;
if (ts->kind == TEMP_CONST) {
ti->is_const = true;
ti->val = ts->val;
ti->z_mask = ts->val;
if (TCG_TARGET_REG_BITS > 32 && ts->type == TCG_TYPE_I32) {
/* High bits of a 32-bit quantity are garbage. */
ti->z_mask |= ~0xffffffffull;
}
} else {
ti->is_const = false;
ti->z_mask = -1;
}
}
static TCGTemp *find_better_copy(TCGContext *s, TCGTemp *ts)
{
TCGTemp *i, *g, *l;
/* If this is already readonly, we can't do better. */
if (temp_readonly(ts)) {
return ts;
}
g = l = NULL;
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
if (temp_readonly(i)) {
return i;
} else if (i->kind > ts->kind) {
if (i->kind == TEMP_GLOBAL) {
g = i;
} else if (i->kind == TEMP_LOCAL) {
l = i;
}
}
}
/* If we didn't find a better representation, return the same temp. */
return g ? g : l ? l : ts;
}
static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2)
{
TCGTemp *i;
if (ts1 == ts2) {
return true;
}
if (!ts_is_copy(ts1) || !ts_is_copy(ts2)) {
return false;
}
for (i = ts_info(ts1)->next_copy; i != ts1; i = ts_info(i)->next_copy) {
if (i == ts2) {
return true;
}
}
return false;
}
static bool args_are_copies(TCGArg arg1, TCGArg arg2)
{
return ts_are_copies(arg_temp(arg1), arg_temp(arg2));
}
static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src)
{
TCGTemp *dst_ts = arg_temp(dst);
TCGTemp *src_ts = arg_temp(src);
const TCGOpDef *def;
TempOptInfo *di;
TempOptInfo *si;
uint64_t z_mask;
TCGOpcode new_op;
if (ts_are_copies(dst_ts, src_ts)) {
tcg_op_remove(ctx->tcg, op);
return true;
}
reset_ts(dst_ts);
di = ts_info(dst_ts);
si = ts_info(src_ts);
def = &tcg_op_defs[op->opc];
if (def->flags & TCG_OPF_VECTOR) {
new_op = INDEX_op_mov_vec;
} else if (def->flags & TCG_OPF_64BIT) {
new_op = INDEX_op_mov_i64;
} else {
new_op = INDEX_op_mov_i32;
}
op->opc = new_op;
/* TCGOP_VECL and TCGOP_VECE remain unchanged. */
op->args[0] = dst;
op->args[1] = src;
z_mask = si->z_mask;
if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_mov_i32) {
/* High bits of the destination are now garbage. */
z_mask |= ~0xffffffffull;
}
di->z_mask = z_mask;
if (src_ts->type == dst_ts->type) {
TempOptInfo *ni = ts_info(si->next_copy);
di->next_copy = si->next_copy;
di->prev_copy = src_ts;
ni->prev_copy = dst_ts;
si->next_copy = dst_ts;
di->is_const = si->is_const;
di->val = si->val;
}
return true;
}
static bool tcg_opt_gen_movi(OptContext *ctx, TCGOp *op,
TCGArg dst, uint64_t val)
{
const TCGOpDef *def = &tcg_op_defs[op->opc];
TCGType type;
TCGTemp *tv;
if (def->flags & TCG_OPF_VECTOR) {
type = TCGOP_VECL(op) + TCG_TYPE_V64;
} else if (def->flags & TCG_OPF_64BIT) {
type = TCG_TYPE_I64;
} else {
type = TCG_TYPE_I32;
}
/* Convert movi to mov with constant temp. */
tv = tcg_constant_internal(type, val);
init_ts_info(ctx, tv);
return tcg_opt_gen_mov(ctx, op, dst, temp_arg(tv));
}
static uint64_t do_constant_folding_2(TCGOpcode op, uint64_t x, uint64_t y)
{
uint64_t l64, h64;
switch (op) {
CASE_OP_32_64(add):
return x + y;
CASE_OP_32_64(sub):
return x - y;
CASE_OP_32_64(mul):
return x * y;
CASE_OP_32_64(and):
return x & y;
CASE_OP_32_64(or):
return x | y;
CASE_OP_32_64(xor):
return x ^ y;
case INDEX_op_shl_i32:
return (uint32_t)x << (y & 31);
case INDEX_op_shl_i64:
return (uint64_t)x << (y & 63);
case INDEX_op_shr_i32:
return (uint32_t)x >> (y & 31);
case INDEX_op_shr_i64:
return (uint64_t)x >> (y & 63);
case INDEX_op_sar_i32:
return (int32_t)x >> (y & 31);
case INDEX_op_sar_i64:
return (int64_t)x >> (y & 63);
case INDEX_op_rotr_i32:
return ror32(x, y & 31);
case INDEX_op_rotr_i64:
return ror64(x, y & 63);
case INDEX_op_rotl_i32:
return rol32(x, y & 31);
case INDEX_op_rotl_i64:
return rol64(x, y & 63);
CASE_OP_32_64(not):
return ~x;
CASE_OP_32_64(neg):
return -x;
CASE_OP_32_64(andc):
return x & ~y;
CASE_OP_32_64(orc):
return x | ~y;
CASE_OP_32_64(eqv):
return ~(x ^ y);
CASE_OP_32_64(nand):
return ~(x & y);
CASE_OP_32_64(nor):
return ~(x | y);
case INDEX_op_clz_i32:
return (uint32_t)x ? clz32(x) : y;
case INDEX_op_clz_i64:
return x ? clz64(x) : y;
case INDEX_op_ctz_i32:
return (uint32_t)x ? ctz32(x) : y;
case INDEX_op_ctz_i64:
return x ? ctz64(x) : y;
case INDEX_op_ctpop_i32:
return ctpop32(x);
case INDEX_op_ctpop_i64:
return ctpop64(x);
CASE_OP_32_64(ext8s):
return (int8_t)x;
CASE_OP_32_64(ext16s):
return (int16_t)x;
CASE_OP_32_64(ext8u):
return (uint8_t)x;
CASE_OP_32_64(ext16u):
return (uint16_t)x;
CASE_OP_32_64(bswap16):
x = bswap16(x);
return y & TCG_BSWAP_OS ? (int16_t)x : x;
CASE_OP_32_64(bswap32):
x = bswap32(x);
return y & TCG_BSWAP_OS ? (int32_t)x : x;
case INDEX_op_bswap64_i64:
return bswap64(x);
case INDEX_op_ext_i32_i64:
case INDEX_op_ext32s_i64:
return (int32_t)x;
case INDEX_op_extu_i32_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_ext32u_i64:
return (uint32_t)x;
case INDEX_op_extrh_i64_i32:
return (uint64_t)x >> 32;
case INDEX_op_muluh_i32:
return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
case INDEX_op_mulsh_i32:
return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
case INDEX_op_muluh_i64:
mulu64(&l64, &h64, x, y);
return h64;
case INDEX_op_mulsh_i64:
muls64(&l64, &h64, x, y);
return h64;
case INDEX_op_div_i32:
/* Avoid crashing on divide by zero, otherwise undefined. */
return (int32_t)x / ((int32_t)y ? : 1);
case INDEX_op_divu_i32:
return (uint32_t)x / ((uint32_t)y ? : 1);
case INDEX_op_div_i64:
return (int64_t)x / ((int64_t)y ? : 1);
case INDEX_op_divu_i64:
return (uint64_t)x / ((uint64_t)y ? : 1);
case INDEX_op_rem_i32:
return (int32_t)x % ((int32_t)y ? : 1);
case INDEX_op_remu_i32:
return (uint32_t)x % ((uint32_t)y ? : 1);
case INDEX_op_rem_i64:
return (int64_t)x % ((int64_t)y ? : 1);
case INDEX_op_remu_i64:
return (uint64_t)x % ((uint64_t)y ? : 1);
default:
fprintf(stderr,
"Unrecognized operation %d in do_constant_folding.\n", op);
tcg_abort();
}
}
static uint64_t do_constant_folding(TCGOpcode op, uint64_t x, uint64_t y)
{
const TCGOpDef *def = &tcg_op_defs[op];
uint64_t res = do_constant_folding_2(op, x, y);
if (!(def->flags & TCG_OPF_64BIT)) {
res = (int32_t)res;
}
return res;
}
static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
{
switch (c) {
case TCG_COND_EQ:
return x == y;
case TCG_COND_NE:
return x != y;
case TCG_COND_LT:
return (int32_t)x < (int32_t)y;
case TCG_COND_GE:
return (int32_t)x >= (int32_t)y;
case TCG_COND_LE:
return (int32_t)x <= (int32_t)y;
case TCG_COND_GT:
return (int32_t)x > (int32_t)y;
case TCG_COND_LTU:
return x < y;
case TCG_COND_GEU:
return x >= y;
case TCG_COND_LEU:
return x <= y;
case TCG_COND_GTU:
return x > y;
default:
tcg_abort();
}
}
static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
{
switch (c) {
case TCG_COND_EQ:
return x == y;
case TCG_COND_NE:
return x != y;
case TCG_COND_LT:
return (int64_t)x < (int64_t)y;
case TCG_COND_GE:
return (int64_t)x >= (int64_t)y;
case TCG_COND_LE:
return (int64_t)x <= (int64_t)y;
case TCG_COND_GT:
return (int64_t)x > (int64_t)y;
case TCG_COND_LTU:
return x < y;
case TCG_COND_GEU:
return x >= y;
case TCG_COND_LEU:
return x <= y;
case TCG_COND_GTU:
return x > y;
default:
tcg_abort();
}
}
static bool do_constant_folding_cond_eq(TCGCond c)
{
switch (c) {
case TCG_COND_GT:
case TCG_COND_LTU:
case TCG_COND_LT:
case TCG_COND_GTU:
case TCG_COND_NE:
return 0;
case TCG_COND_GE:
case TCG_COND_GEU:
case TCG_COND_LE:
case TCG_COND_LEU:
case TCG_COND_EQ:
return 1;
default:
tcg_abort();
}
}
/*
* 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_cond(TCGOpcode op, TCGArg x,
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)) {
const TCGOpDef *def = &tcg_op_defs[op];
tcg_debug_assert(!(def->flags & TCG_OPF_VECTOR));
if (def->flags & TCG_OPF_64BIT) {
return do_constant_folding_cond_64(xv, yv, c);
} else {
return do_constant_folding_cond_32(xv, yv, c);
}
} 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, 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, t1, t2);
return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
}
return false;
}
/*
* These outermost fold_<op> functions are sorted alphabetically.
*/
static bool fold_add(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_addsub2_i32(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])) {
uint32_t al = arg_info(op->args[2])->val;
uint32_t ah = arg_info(op->args[3])->val;
uint32_t bl = arg_info(op->args[4])->val;
uint32_t bh = arg_info(op->args[5])->val;
uint64_t a = ((uint64_t)ah << 32) | al;
uint64_t b = ((uint64_t)bh << 32) | bl;
TCGArg rl, rh;
TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_mov_i32);
if (add) {
a += b;
} else {
a -= b;
}
rl = op->args[0];
rh = op->args[1];
tcg_opt_gen_movi(ctx, op, rl, (int32_t)a);
tcg_opt_gen_movi(ctx, op2, rh, (int32_t)(a >> 32));
return true;
}
return false;
}
static bool fold_add2_i32(OptContext *ctx, TCGOp *op)
{
return fold_addsub2_i32(ctx, op, true);
}
static bool fold_and(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_andc(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_brcond(OptContext *ctx, TCGOp *op)
{
TCGCond cond = op->args[2];
int i = do_constant_folding_cond(op->opc, 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(INDEX_op_brcond_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(INDEX_op_brcond_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)
{
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
t = do_constant_folding(op->opc, t, op->args[2]);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
return false;
}
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)
{
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, 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]);
}
return false;
}
static bool fold_ctpop(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op);
}
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);
}
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)
{
return fold_const2(ctx, op);
}
static bool fold_extract(OptContext *ctx, TCGOp *op)
{
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);
}
return false;
}
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)
{
return fold_const1(ctx, op);
}
static bool fold_extu(OptContext *ctx, TCGOp *op)
{
return fold_const1(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)
{
TCGOpcode opc = op->opc;
TCGCond cond = op->args[5];
int i = do_constant_folding_cond(opc, op->args[1], op->args[2], cond);
if (i >= 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[4 - i]);
}
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;
opc = (opc == INDEX_op_movcond_i32
? INDEX_op_setcond_i32 : INDEX_op_setcond_i64);
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)
{
return fold_const2(ctx, op);
}
static bool fold_mul_highpart(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_mulu2_i32(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
uint32_t a = arg_info(op->args[2])->val;
uint32_t b = arg_info(op->args[3])->val;
uint64_t r = (uint64_t)a * b;
TCGArg rl, rh;
TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_mov_i32);
rl = op->args[0];
rh = op->args[1];
tcg_opt_gen_movi(ctx, op, rl, (int32_t)r);
tcg_opt_gen_movi(ctx, op2, rh, (int32_t)(r >> 32));
return true;
}
return false;
}
static bool fold_nand(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_neg(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op);
}
static bool fold_nor(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_not(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op);
}
static bool fold_or(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_orc(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_qemu_ld(OptContext *ctx, TCGOp *op)
{
/* 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(op->opc, op->args[1], op->args[2], cond);
if (i >= 0) {
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
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(INDEX_op_setcond_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(INDEX_op_setcond_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;
}
return false;
do_setcond_const:
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
static bool fold_sextract(OptContext *ctx, TCGOp *op)
{
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);
}
return false;
}
static bool fold_shift(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_sub(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op);
}
static bool fold_sub2_i32(OptContext *ctx, TCGOp *op)
{
return fold_addsub2_i32(ctx, op, false);
}
static bool fold_xor(OptContext *ctx, TCGOp *op)
{
return fold_const2(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) {
uint64_t z_mask, partmask, affected, tmp;
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);
/* 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;
}
/* Simplify expressions for "shift/rot r, 0, a => movi r, 0",
and "sub r, 0, a => neg r, a" case. */
switch (opc) {
CASE_OP_32_64(shl):
CASE_OP_32_64(shr):
CASE_OP_32_64(sar):
CASE_OP_32_64(rotl):
CASE_OP_32_64(rotr):
if (arg_is_const(op->args[1])
&& arg_info(op->args[1])->val == 0) {
tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
continue;
}
break;
CASE_OP_32_64_VEC(sub):
{
TCGOpcode neg_op;
bool have_neg;
if (arg_is_const(op->args[2])) {
/* Proceed with possible constant folding. */
break;
}
if (opc == INDEX_op_sub_i32) {
neg_op = INDEX_op_neg_i32;
have_neg = TCG_TARGET_HAS_neg_i32;
} else if (opc == INDEX_op_sub_i64) {
neg_op = INDEX_op_neg_i64;
have_neg = TCG_TARGET_HAS_neg_i64;
} else if (TCG_TARGET_HAS_neg_vec) {
TCGType type = TCGOP_VECL(op) + TCG_TYPE_V64;
unsigned vece = TCGOP_VECE(op);
neg_op = INDEX_op_neg_vec;
have_neg = tcg_can_emit_vec_op(neg_op, type, vece) > 0;
} else {
break;
}
if (!have_neg) {
break;
}
if (arg_is_const(op->args[1])
&& arg_info(op->args[1])->val == 0) {
op->opc = neg_op;
reset_temp(op->args[0]);
op->args[1] = op->args[2];
continue;
}
}
break;
CASE_OP_32_64_VEC(xor):
CASE_OP_32_64(nand):
if (!arg_is_const(op->args[1])
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == -1) {
i = 1;
goto try_not;
}
break;
CASE_OP_32_64(nor):
if (!arg_is_const(op->args[1])
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == 0) {
i = 1;
goto try_not;
}
break;
CASE_OP_32_64_VEC(andc):
if (!arg_is_const(op->args[2])
&& arg_is_const(op->args[1])
&& arg_info(op->args[1])->val == -1) {
i = 2;
goto try_not;
}
break;
CASE_OP_32_64_VEC(orc):
CASE_OP_32_64(eqv):
if (!arg_is_const(op->args[2])
&& arg_is_const(op->args[1])
&& arg_info(op->args[1])->val == 0) {
i = 2;
goto try_not;
}
break;
try_not:
{
TCGOpcode not_op;
bool have_not;
if (def->flags & TCG_OPF_VECTOR) {
not_op = INDEX_op_not_vec;
have_not = TCG_TARGET_HAS_not_vec;
} else if (def->flags & TCG_OPF_64BIT) {
not_op = INDEX_op_not_i64;
have_not = TCG_TARGET_HAS_not_i64;
} else {
not_op = INDEX_op_not_i32;
have_not = TCG_TARGET_HAS_not_i32;
}
if (!have_not) {
break;
}
op->opc = not_op;
reset_temp(op->args[0]);
op->args[1] = op->args[i];
continue;
}
default:
break;
}
/* Simplify expression for "op r, a, const => mov r, a" cases */
switch (opc) {
CASE_OP_32_64_VEC(add):
CASE_OP_32_64_VEC(sub):
CASE_OP_32_64_VEC(or):
CASE_OP_32_64_VEC(xor):
CASE_OP_32_64_VEC(andc):
CASE_OP_32_64(shl):
CASE_OP_32_64(shr):
CASE_OP_32_64(sar):
CASE_OP_32_64(rotl):
CASE_OP_32_64(rotr):
if (!arg_is_const(op->args[1])
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == 0) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[1]);
continue;
}
break;
CASE_OP_32_64_VEC(and):
CASE_OP_32_64_VEC(orc):
CASE_OP_32_64(eqv):
if (!arg_is_const(op->args[1])
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == -1) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[1]);
continue;
}
break;
default:
break;
}
/* Simplify using known-zero bits. Currently only ops with a single
output argument is supported. */
z_mask = -1;
affected = -1;
switch (opc) {
CASE_OP_32_64(ext8s):
if ((arg_info(op->args[1])->z_mask & 0x80) != 0) {
break;
}
QEMU_FALLTHROUGH;
CASE_OP_32_64(ext8u):
z_mask = 0xff;
goto and_const;
CASE_OP_32_64(ext16s):
if ((arg_info(op->args[1])->z_mask & 0x8000) != 0) {
break;
}
QEMU_FALLTHROUGH;
CASE_OP_32_64(ext16u):
z_mask = 0xffff;
goto and_const;
case INDEX_op_ext32s_i64:
if ((arg_info(op->args[1])->z_mask & 0x80000000) != 0) {
break;
}
QEMU_FALLTHROUGH;
case INDEX_op_ext32u_i64:
z_mask = 0xffffffffU;
goto and_const;
CASE_OP_32_64(and):
z_mask = arg_info(op->args[2])->z_mask;
if (arg_is_const(op->args[2])) {
and_const:
affected = arg_info(op->args[1])->z_mask & ~z_mask;
}
z_mask = arg_info(op->args[1])->z_mask & z_mask;
break;
case INDEX_op_ext_i32_i64:
if ((arg_info(op->args[1])->z_mask & 0x80000000) != 0) {
break;
}
QEMU_FALLTHROUGH;
case INDEX_op_extu_i32_i64:
/* We do not compute affected as it is a size changing op. */
z_mask = (uint32_t)arg_info(op->args[1])->z_mask;
break;
CASE_OP_32_64(andc):
/* Known-zeros does not imply known-ones. Therefore unless
op->args[2] is constant, we can't infer anything from it. */
if (arg_is_const(op->args[2])) {
z_mask = ~arg_info(op->args[2])->z_mask;
goto and_const;
}
/* But we certainly know nothing outside args[1] may be set. */
z_mask = arg_info(op->args[1])->z_mask;
break;
case INDEX_op_sar_i32:
if (arg_is_const(op->args[2])) {
tmp = arg_info(op->args[2])->val & 31;
z_mask = (int32_t)arg_info(op->args[1])->z_mask >> tmp;
}
break;
case INDEX_op_sar_i64:
if (arg_is_const(op->args[2])) {
tmp = arg_info(op->args[2])->val & 63;
z_mask = (int64_t)arg_info(op->args[1])->z_mask >> tmp;
}
break;
case INDEX_op_shr_i32:
if (arg_is_const(op->args[2])) {
tmp = arg_info(op->args[2])->val & 31;
z_mask = (uint32_t)arg_info(op->args[1])->z_mask >> tmp;
}
break;
case INDEX_op_shr_i64:
if (arg_is_const(op->args[2])) {
tmp = arg_info(op->args[2])->val & 63;
z_mask = (uint64_t)arg_info(op->args[1])->z_mask >> tmp;
}
break;
case INDEX_op_extrl_i64_i32:
z_mask = (uint32_t)arg_info(op->args[1])->z_mask;
break;
case INDEX_op_extrh_i64_i32:
z_mask = (uint64_t)arg_info(op->args[1])->z_mask >> 32;
break;
CASE_OP_32_64(shl):
if (arg_is_const(op->args[2])) {
tmp = arg_info(op->args[2])->val & (TCG_TARGET_REG_BITS - 1);
z_mask = arg_info(op->args[1])->z_mask << tmp;
}
break;
CASE_OP_32_64(neg):
/* Set to 1 all bits to the left of the rightmost. */
z_mask = -(arg_info(op->args[1])->z_mask
& -arg_info(op->args[1])->z_mask);
break;
CASE_OP_32_64(deposit):
z_mask = deposit64(arg_info(op->args[1])->z_mask,
op->args[3], op->args[4],
arg_info(op->args[2])->z_mask);
break;
CASE_OP_32_64(extract):
z_mask = extract64(arg_info(op->args[1])->z_mask,
op->args[2], op->args[3]);
if (op->args[2] == 0) {
affected = arg_info(op->args[1])->z_mask & ~z_mask;
}
break;
CASE_OP_32_64(sextract):
z_mask = sextract64(arg_info(op->args[1])->z_mask,
op->args[2], op->args[3]);
if (op->args[2] == 0 && (tcg_target_long)z_mask >= 0) {
affected = arg_info(op->args[1])->z_mask & ~z_mask;
}
break;
CASE_OP_32_64(or):
CASE_OP_32_64(xor):
z_mask = arg_info(op->args[1])->z_mask
| arg_info(op->args[2])->z_mask;
break;
case INDEX_op_clz_i32:
case INDEX_op_ctz_i32:
z_mask = arg_info(op->args[2])->z_mask | 31;
break;
case INDEX_op_clz_i64:
case INDEX_op_ctz_i64:
z_mask = arg_info(op->args[2])->z_mask | 63;
break;
case INDEX_op_ctpop_i32:
z_mask = 32 | 31;
break;
case INDEX_op_ctpop_i64:
z_mask = 64 | 63;
break;
CASE_OP_32_64(setcond):
case INDEX_op_setcond2_i32:
z_mask = 1;
break;
CASE_OP_32_64(movcond):
z_mask = arg_info(op->args[3])->z_mask
| arg_info(op->args[4])->z_mask;
break;
CASE_OP_32_64(ld8u):
z_mask = 0xff;
break;
CASE_OP_32_64(ld16u):
z_mask = 0xffff;
break;
case INDEX_op_ld32u_i64:
z_mask = 0xffffffffu;
break;
CASE_OP_32_64(qemu_ld):
{
MemOpIdx oi = op->args[def->nb_oargs + def->nb_iargs];
MemOp mop = get_memop(oi);
if (!(mop & MO_SIGN)) {
z_mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
}
}
break;
CASE_OP_32_64(bswap16):
z_mask = arg_info(op->args[1])->z_mask;
if (z_mask <= 0xffff) {
op->args[2] |= TCG_BSWAP_IZ;
}
z_mask = bswap16(z_mask);
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
case TCG_BSWAP_OZ:
break;
case TCG_BSWAP_OS:
z_mask = (int16_t)z_mask;
break;
default: /* undefined high bits */
z_mask |= MAKE_64BIT_MASK(16, 48);
break;
}
break;
case INDEX_op_bswap32_i64:
z_mask = arg_info(op->args[1])->z_mask;
if (z_mask <= 0xffffffffu) {
op->args[2] |= TCG_BSWAP_IZ;
}
z_mask = bswap32(z_mask);
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
case TCG_BSWAP_OZ:
break;
case TCG_BSWAP_OS:
z_mask = (int32_t)z_mask;
break;
default: /* undefined high bits */
z_mask |= MAKE_64BIT_MASK(32, 32);
break;
}
break;
default:
break;
}
/* 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. */
partmask = z_mask;
if (!(def->flags & TCG_OPF_64BIT)) {
z_mask |= ~(tcg_target_ulong)0xffffffffu;
partmask &= 0xffffffffu;
affected &= 0xffffffffu;
}
ctx.z_mask = z_mask;
if (partmask == 0) {
tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
continue;
}
if (affected == 0) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[1]);
continue;
}
/* Simplify expression for "op r, a, 0 => movi r, 0" cases */
switch (opc) {
CASE_OP_32_64_VEC(and):
CASE_OP_32_64_VEC(mul):
CASE_OP_32_64(muluh):
CASE_OP_32_64(mulsh):
if (arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == 0) {
tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
continue;
}
break;
default:
break;
}
/* Simplify expression for "op r, a, a => mov r, a" cases */
switch (opc) {
CASE_OP_32_64_VEC(or):
CASE_OP_32_64_VEC(and):
if (args_are_copies(op->args[1], op->args[2])) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[1]);
continue;
}
break;
default:
break;
}
/* Simplify expression for "op r, a, a => movi r, 0" cases */
switch (opc) {
CASE_OP_32_64_VEC(andc):
CASE_OP_32_64_VEC(sub):
CASE_OP_32_64_VEC(xor):
if (args_are_copies(op->args[1], op->args[2])) {
tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
continue;
}
break;
default:
break;
}
/*
* 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 INDEX_op_add2_i32:
done = fold_add2_i32(&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 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 INDEX_op_mulu2_i32:
done = fold_mulu2_i32(&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 INDEX_op_sub2_i32:
done = fold_sub2_i32(&ctx, op);
break;
CASE_OP_32_64_VEC(xor):
done = fold_xor(&ctx, op);
break;
default:
break;
}
if (!done) {
finish_folding(&ctx, op);
}
}
}
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