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tcg: Avoid loops against variable bounds

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Copy s->nb_globals or s->nb_temps to a local variable for the purposes
of iteration. This should allow the compiler to use low-overhead
looping constructs on some hosts.

Backports commit ac3b88911ebc6fc841f28898ee8aed40839debe2 from qemu
This commit is contained in:
Richard Henderson 2018-03-05 07:49:59 -05:00 committed by Lioncash
parent 1f4ac863bf
commit 35a7a9c9a4
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 9 additions and 17 deletions
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26
qemu/tcg/tcg.c
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@ -1149,23 +1149,15 @@ void tcg_gen_callN(TCGContext *s, void *func, TCGArg ret,
static void tcg_reg_alloc_start(TCGContext *s)
{
int i;
int i, n;
TCGTemp *ts;
for(i = 0; i < s->nb_globals; i++) {
for (i = 0, n = s->nb_globals; i < n; i++) {
ts = &s->temps[i];
if (ts->fixed_reg) {
ts->val_type = TEMP_VAL_REG;
} else {
ts->val_type = TEMP_VAL_MEM;
}
ts->val_type = (ts->fixed_reg ? TEMP_VAL_REG : TEMP_VAL_MEM);
}
for(i = s->nb_globals; i < s->nb_temps; i++) {
for (n = s->nb_temps; i < n; i++) {
ts = &s->temps[i];
if (ts->temp_local) {
ts->val_type = TEMP_VAL_MEM;
} else {
ts->val_type = TEMP_VAL_DEAD;
}
ts->val_type = (ts->temp_local ? TEMP_VAL_MEM : TEMP_VAL_DEAD);
ts->mem_allocated = 0;
ts->fixed_reg = 0;
}
@ -2359,9 +2351,9 @@ static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
temporary registers needs to be allocated to store a constant. */
static void save_globals(TCGContext *s, TCGRegSet allocated_regs)
{
int i;
int i, n;
for (i = 0; i < s->nb_globals; i++) {
for (i = 0, n = s->nb_globals; i < n; i++) {
temp_save(s, &s->temps[i], allocated_regs);
}
}
@ -2371,9 +2363,9 @@ static void save_globals(TCGContext *s, TCGRegSet allocated_regs)
temporary registers needs to be allocated to store a constant. */
static void sync_globals(TCGContext *s, TCGRegSet allocated_regs)
{
int i;
int i, n;
for (i = 0; i < s->nb_globals; i++) {
for (i = 0, n = s->nb_globals; i < n; i++) {
TCGTemp *ts = &s->temps[i];
tcg_debug_assert(ts->val_type != TEMP_VAL_REG
|| ts->fixed_reg