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tcg/optimize: Improve find_better_copy

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Prefer TEMP_CONST over anything else.

Backports 4c868ce6454872d395b29de8d82387b2ad14aeeb
This commit is contained in:
Richard Henderson 2021-03-03 21:35:20 -05:00 committed by Lioncash
parent 8edc9b76dd
commit e751b45aea
1 changed files with 12 additions and 15 deletions
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27
qemu/tcg/optimize.c
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@ -126,31 +126,28 @@ static void init_arg_info(TCGContext *s, TCGArg arg)
static TCGTemp *find_better_copy(TCGTemp *ts)
{
TCGTemp *i;
TCGTemp *i, *g, *l;
/* If this is already a global, we can't do better. */
if (ts->kind >= TEMP_GLOBAL) {
/* If this is already readonly, we can't do better. */
if (temp_readonly(ts)) {
return ts;
}
/* Search for a global first. */
g = l = NULL;
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
if (i->kind >= TEMP_GLOBAL) {
if (temp_readonly(i)) {
return i;
}
}
/* If it is a temp, search for a temp local. */
if (ts->kind == TEMP_NORMAL) {
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
if (i->kind >= TEMP_LOCAL) {
return i;
} else if (i->kind > ts->kind) {
if (i->kind == TEMP_GLOBAL) {
g = i;
} else if (i->kind == TEMP_LOCAL) {
l = i;
}
}
}
/* Failure to find a better representation, return the same temp. */
return ts;
/* 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)