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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.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-11-02 11:21:44 -06:00 committed by Richard Henderson
parent b83eabeac0
commit ac3b88911e
1 changed files with 10 additions and 17 deletions
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27
tcg/tcg.c
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@ -1159,23 +1159,16 @@ 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;
}
@ -2277,9 +2270,9 @@ 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);
}
}
@ -2289,9 +2282,9 @@ 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