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tcg: Make call address a constant parameter 

Avoid allocating a tcg temporary to hold the constant address,
and instead place it directly into the op_call arguments.

At the same time, convert to the newly introduced tcg_out_call
backend function, rather than invoking tcg_out_op for the call.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-03-22 20:06:52 -07:00
parent dddbb2e1e3
commit cf06667428
5 changed files with 72 additions and 152 deletions
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75
tcg/optimize.c
View File

@ -513,12 +513,8 @@ static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
TCGArg *args, TCGOpDef *tcg_op_defs)
{
int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args;
tcg_target_ulong mask, affected;
TCGOpcode op;
const TCGOpDef *def;
int nb_ops, op_index, nb_temps, nb_globals;
TCGArg *gen_args;
TCGArg tmp;
/* Array VALS has an element for each temp.
If this temp holds a constant then its value is kept in VALS' element.
@ -532,22 +528,27 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
nb_ops = tcg_opc_ptr - s->gen_opc_buf;
gen_args = args;
for (op_index = 0; op_index < nb_ops; op_index++) {
op = s->gen_opc_buf[op_index];
def = &tcg_op_defs[op];
/* Do copy propagation */
TCGOpcode op = s->gen_opc_buf[op_index];
const TCGOpDef *def = &tcg_op_defs[op];
tcg_target_ulong mask, affected;
int nb_oargs, nb_iargs, nb_args, i;
TCGArg tmp;
if (op == INDEX_op_call) {
int nb_oargs = args[0] >> 16;
int nb_iargs = args[0] & 0xffff;
for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
if (temps[args[i]].state == TCG_TEMP_COPY) {
args[i] = find_better_copy(s, args[i]);
}
}
*gen_args++ = tmp = *args++;
nb_oargs = tmp >> 16;
nb_iargs = tmp & 0xffff;
nb_args = nb_oargs + nb_iargs + def->nb_cargs;
} else {
for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
if (temps[args[i]].state == TCG_TEMP_COPY) {
args[i] = find_better_copy(s, args[i]);
}
nb_oargs = def->nb_oargs;
nb_iargs = def->nb_iargs;
nb_args = def->nb_args;
}
/* Do copy propagation */
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
if (temps[args[i]].state == TCG_TEMP_COPY) {
args[i] = find_better_copy(s, args[i]);
}
}
@ -882,7 +883,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
CASE_OP_32_64(qemu_ld):
{
TCGMemOp mop = args[def->nb_oargs + def->nb_iargs];
TCGMemOp mop = args[nb_oargs + nb_iargs];
if (!(mop & MO_SIGN)) {
mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
}
@ -900,15 +901,15 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
}
if (mask == 0) {
assert(def->nb_oargs == 1);
assert(nb_oargs == 1);
s->gen_opc_buf[op_index] = op_to_movi(op);
tcg_opt_gen_movi(gen_args, args[0], 0);
args += def->nb_oargs + def->nb_iargs + def->nb_cargs;
args += nb_args;
gen_args += 2;
continue;
}
if (affected == 0) {
assert(def->nb_oargs == 1);
assert(nb_oargs == 1);
if (temps_are_copies(args[0], args[1])) {
s->gen_opc_buf[op_index] = INDEX_op_nop;
} else if (temps[args[1]].state != TCG_TEMP_CONST) {
@ -920,7 +921,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
tcg_opt_gen_movi(gen_args, args[0], temps[args[1]].val);
gen_args += 2;
}
args += def->nb_iargs + 1;
args += nb_args;
continue;
}
@ -1246,24 +1247,13 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
break;
case INDEX_op_call:
nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
if (!(args[nb_call_args + 1] & (TCG_CALL_NO_READ_GLOBALS |
TCG_CALL_NO_WRITE_GLOBALS))) {
if (!(args[nb_oargs + nb_iargs + 1]
& (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
for (i = 0; i < nb_globals; i++) {
reset_temp(i);
}
}
for (i = 0; i < (args[0] >> 16); i++) {
reset_temp(args[i + 1]);
}
i = nb_call_args + 3;
while (i) {
*gen_args = *args;
args++;
gen_args++;
i--;
}
break;
goto do_reset_output;
default:
do_default:
@ -1275,7 +1265,8 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
if (def->flags & TCG_OPF_BB_END) {
reset_all_temps(nb_temps);
} else {
for (i = 0; i < def->nb_oargs; i++) {
do_reset_output:
for (i = 0; i < nb_oargs; i++) {
reset_temp(args[i]);
/* Save the corresponding known-zero bits mask for the
first output argument (only one supported so far). */
@ -1284,11 +1275,11 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
}
}
}
for (i = 0; i < def->nb_args; i++) {
for (i = 0; i < nb_args; i++) {
gen_args[i] = args[i];
}
args += def->nb_args;
gen_args += def->nb_args;
args += nb_args;
gen_args += nb_args;
break;
}
}

16
tcg/tcg-op.h
View File

@ -390,11 +390,7 @@ static inline int tcg_gen_sizemask(int n, int is_64bit, int is_signed)
static inline void tcg_gen_helperN(void *func, int flags, int sizemask,
TCGArg ret, int nargs, TCGArg *args)
{
TCGv_ptr fn;
fn = tcg_const_ptr(func);
tcg_gen_callN(&tcg_ctx, fn, flags, sizemask, ret,
nargs, args);
tcg_temp_free_ptr(fn);
tcg_gen_callN(&tcg_ctx, func, flags, sizemask, ret, nargs, args);
}
/* Note: Both tcg_gen_helper32() and tcg_gen_helper64() are currently
@ -405,29 +401,23 @@ static inline void tcg_gen_helperN(void *func, int flags, int sizemask,
static inline void tcg_gen_helper32(void *func, int sizemask, TCGv_i32 ret,
TCGv_i32 a, TCGv_i32 b)
{
TCGv_ptr fn;
TCGArg args[2];
fn = tcg_const_ptr(func);
args[0] = GET_TCGV_I32(a);
args[1] = GET_TCGV_I32(b);
tcg_gen_callN(&tcg_ctx, fn,
tcg_gen_callN(&tcg_ctx, func,
TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_SIDE_EFFECTS,
sizemask, GET_TCGV_I32(ret), 2, args);
tcg_temp_free_ptr(fn);
}
static inline void tcg_gen_helper64(void *func, int sizemask, TCGv_i64 ret,
TCGv_i64 a, TCGv_i64 b)
{
TCGv_ptr fn;
TCGArg args[2];
fn = tcg_const_ptr(func);
args[0] = GET_TCGV_I64(a);
args[1] = GET_TCGV_I64(b);
tcg_gen_callN(&tcg_ctx, fn,
tcg_gen_callN(&tcg_ctx, func,
TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_SIDE_EFFECTS,
sizemask, GET_TCGV_I64(ret), 2, args);
tcg_temp_free_ptr(fn);
}
/* 32 bit ops */

2
tcg/tcg-opc.h
View File

@ -40,7 +40,7 @@ DEF(discard, 1, 0, 0, TCG_OPF_NOT_PRESENT)
DEF(set_label, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_NOT_PRESENT)
/* variable number of parameters */
DEF(call, 0, 1, 2, TCG_OPF_CALL_CLOBBER)
DEF(call, 0, 0, 3, TCG_OPF_CALL_CLOBBER)
DEF(br, 0, 0, 1, TCG_OPF_BB_END)

129
tcg/tcg.c
View File

@ -101,6 +101,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
const int *const_args);
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
intptr_t arg2);
static void tcg_out_call(TCGContext *s, tcg_insn_unit *target);
static int tcg_target_const_match(tcg_target_long val, TCGType type,
const TCGArgConstraint *arg_ct);
static void tcg_out_tb_init(TCGContext *s);
@ -705,7 +706,7 @@ int tcg_check_temp_count(void)
/* Note: we convert the 64 bit args to 32 bit and do some alignment
and endian swap. Maybe it would be better to do the alignment
and endian swap in tcg_reg_alloc_call(). */
void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
void tcg_gen_callN(TCGContext *s, void *func, unsigned int flags,
int sizemask, TCGArg ret, int nargs, TCGArg *args)
{
int i;
@ -832,11 +833,10 @@ void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
*s->gen_opparam_ptr++ = args[i];
real_args++;
}
*s->gen_opparam_ptr++ = GET_TCGV_PTR(func);
*s->gen_opparam_ptr++ = (uintptr_t)func;
*s->gen_opparam_ptr++ = flags;
*nparam = (nb_rets << 16) | (real_args + 1);
*nparam = (nb_rets << 16) | real_args;
/* total parameters, needed to go backward in the instruction stream */
*s->gen_opparam_ptr++ = 1 + nb_rets + real_args + 3;
@ -1243,49 +1243,21 @@ void tcg_dump_ops(TCGContext *s)
nb_iargs = arg & 0xffff;
nb_cargs = def->nb_cargs;
qemu_log(" %s ", def->name);
/* function name */
qemu_log("%s",
tcg_get_arg_str_idx(s, buf, sizeof(buf),
args[nb_oargs + nb_iargs - 1]));
/* flags */
qemu_log(",$0x%" TCG_PRIlx, args[nb_oargs + nb_iargs]);
/* nb out args */
qemu_log(",$%d", nb_oargs);
for(i = 0; i < nb_oargs; i++) {
qemu_log(",");
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
/* function name, flags, out args */
qemu_log(" %s %s,$0x%" TCG_PRIlx ",$%d", def->name,
tcg_find_helper(s, args[nb_oargs + nb_iargs]),
args[nb_oargs + nb_iargs + 1], nb_oargs);
for (i = 0; i < nb_oargs; i++) {
qemu_log(",%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
args[i]));
}
for(i = 0; i < (nb_iargs - 1); i++) {
qemu_log(",");
if (args[nb_oargs + i] == TCG_CALL_DUMMY_ARG) {
qemu_log("<dummy>");
} else {
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
args[nb_oargs + i]));
}
}
} else if (c == INDEX_op_movi_i32 || c == INDEX_op_movi_i64) {
tcg_target_ulong val;
const char *name;
nb_oargs = def->nb_oargs;
nb_iargs = def->nb_iargs;
nb_cargs = def->nb_cargs;
qemu_log(" %s %s,$", def->name,
tcg_get_arg_str_idx(s, buf, sizeof(buf), args[0]));
val = args[1];
name = tcg_find_helper(s, val);
if (name) {
qemu_log("%s", name);
} else {
if (c == INDEX_op_movi_i32) {
qemu_log("0x%x", (uint32_t)val);
} else {
qemu_log("0x%" PRIx64 , (uint64_t)val);
for (i = 0; i < nb_iargs; i++) {
TCGArg arg = args[nb_oargs + i];
const char *t = "<dummy>";
if (arg != TCG_CALL_DUMMY_ARG) {
t = tcg_get_arg_str_idx(s, buf, sizeof(buf), arg);
}
qemu_log(",%s", t);
}
} else {
qemu_log(" %s ", def->name);
@ -1548,9 +1520,9 @@ static inline void tcg_la_bb_end(TCGContext *s, uint8_t *dead_temps,
temporaries are removed. */
static void tcg_liveness_analysis(TCGContext *s)
{
int i, op_index, nb_args, nb_iargs, nb_oargs, arg, nb_ops;
int i, op_index, nb_args, nb_iargs, nb_oargs, nb_ops;
TCGOpcode op, op_new, op_new2;
TCGArg *args;
TCGArg *args, arg;
const TCGOpDef *def;
uint8_t *dead_temps, *mem_temps;
uint16_t dead_args;
@ -1580,15 +1552,15 @@ static void tcg_liveness_analysis(TCGContext *s)
nb_args = args[-1];
args -= nb_args;
nb_iargs = args[0] & 0xffff;
nb_oargs = args[0] >> 16;
args++;
call_flags = args[nb_oargs + nb_iargs];
arg = *args++;
nb_iargs = arg & 0xffff;
nb_oargs = arg >> 16;
call_flags = args[nb_oargs + nb_iargs + 1];
/* pure functions can be removed if their result is not
used */
if (call_flags & TCG_CALL_NO_SIDE_EFFECTS) {
for(i = 0; i < nb_oargs; i++) {
for (i = 0; i < nb_oargs; i++) {
arg = args[i];
if (!dead_temps[arg] || mem_temps[arg]) {
goto do_not_remove_call;
@ -1602,7 +1574,7 @@ static void tcg_liveness_analysis(TCGContext *s)
/* output args are dead */
dead_args = 0;
sync_args = 0;
for(i = 0; i < nb_oargs; i++) {
for (i = 0; i < nb_oargs; i++) {
arg = args[i];
if (dead_temps[arg]) {
dead_args |= (1 << i);
@ -1625,7 +1597,7 @@ static void tcg_liveness_analysis(TCGContext *s)
}
/* input args are live */
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
arg = args[i];
if (arg != TCG_CALL_DUMMY_ARG) {
if (dead_temps[arg]) {
@ -2372,26 +2344,27 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
uint16_t dead_args, uint8_t sync_args)
{
int nb_iargs, nb_oargs, flags, nb_regs, i, reg, nb_params;
TCGArg arg, func_arg;
TCGArg arg;
TCGTemp *ts;
intptr_t stack_offset;
size_t call_stack_size;
uintptr_t func_addr;
int const_func_arg, allocate_args;
tcg_insn_unit *func_addr;
int allocate_args;
TCGRegSet allocated_regs;
const TCGArgConstraint *arg_ct;
arg = *args++;
nb_oargs = arg >> 16;
nb_iargs = arg & 0xffff;
nb_params = nb_iargs - 1;
nb_params = nb_iargs;
flags = args[nb_oargs + nb_iargs];
func_addr = (tcg_insn_unit *)(intptr_t)args[nb_oargs + nb_iargs];
flags = args[nb_oargs + nb_iargs + 1];
nb_regs = ARRAY_SIZE(tcg_target_call_iarg_regs);
if (nb_regs > nb_params)
if (nb_regs > nb_params) {
nb_regs = nb_params;
}
/* assign stack slots first */
call_stack_size = (nb_params - nb_regs) * sizeof(tcg_target_long);
@ -2459,40 +2432,6 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
}
}
/* assign function address */
func_arg = args[nb_oargs + nb_iargs - 1];
arg_ct = &def->args_ct[0];
ts = &s->temps[func_arg];
func_addr = ts->val;
const_func_arg = 0;
if (ts->val_type == TEMP_VAL_MEM) {
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset);
func_arg = reg;
tcg_regset_set_reg(allocated_regs, reg);
} else if (ts->val_type == TEMP_VAL_REG) {
reg = ts->reg;
if (!tcg_regset_test_reg(arg_ct->u.regs, reg)) {
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
tcg_out_mov(s, ts->type, reg, ts->reg);
}
func_arg = reg;
tcg_regset_set_reg(allocated_regs, reg);
} else if (ts->val_type == TEMP_VAL_CONST) {
if (tcg_target_const_match(func_addr, ts->type, arg_ct)) {
const_func_arg = 1;
func_arg = func_addr;
} else {
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
tcg_out_movi(s, ts->type, reg, func_addr);
func_arg = reg;
tcg_regset_set_reg(allocated_regs, reg);
}
} else {
tcg_abort();
}
/* mark dead temporaries and free the associated registers */
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
if (IS_DEAD_ARG(i)) {
@ -2517,7 +2456,7 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
save_globals(s, allocated_regs);
}
tcg_out_op(s, opc, &func_arg, &const_func_arg);
tcg_out_call(s, func_addr);
/* assign output registers and emit moves if needed */
for(i = 0; i < nb_oargs; i++) {

2
tcg/tcg.h
View File

@ -725,7 +725,7 @@ void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
#define tcg_temp_free_ptr(T) tcg_temp_free_i64(TCGV_PTR_TO_NAT(T))
#endif
void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
void tcg_gen_callN(TCGContext *s, void *func, unsigned int flags,
int sizemask, TCGArg ret, int nargs, TCGArg *args);
void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,