tcg/optimize: Improve find_better_copy
Prefer TEMP_CONST over anything else. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -122,31 +122,28 @@ static void init_arg_info(TempOptInfo *infos,
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static TCGTemp *find_better_copy(TCGContext *s, TCGTemp *ts)
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{
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TCGTemp *i;
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TCGTemp *i, *g, *l;
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/* If this is already a global, we can't do better. */
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if (ts->kind >= TEMP_GLOBAL) {
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/* If this is already readonly, we can't do better. */
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if (temp_readonly(ts)) {
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return ts;
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}
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/* Search for a global first. */
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g = l = NULL;
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for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
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if (i->kind >= TEMP_GLOBAL) {
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if (temp_readonly(i)) {
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return i;
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}
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}
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/* If it is a temp, search for a temp local. */
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if (ts->kind == TEMP_NORMAL) {
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for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
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if (i->kind >= TEMP_LOCAL) {
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return i;
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} else if (i->kind > ts->kind) {
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if (i->kind == TEMP_GLOBAL) {
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g = i;
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} else if (i->kind == TEMP_LOCAL) {
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l = i;
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}
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}
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}
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/* Failure to find a better representation, return the same temp. */
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return ts;
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/* If we didn't find a better representation, return the same temp. */
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return g ? g : l ? l : ts;
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}
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static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2)
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