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tcg/optimize: Build and use one and affected bits in fold_or

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Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-09 21:35:53 -06:00
parent d89504b047
commit 84b399df9a
1 changed files with 8 additions and 2 deletions
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10
tcg/optimize.c
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@ -2263,7 +2263,7 @@ static bool fold_not(OptContext *ctx, TCGOp *op)
static bool fold_or(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask, s_mask;
uint64_t z_mask, o_mask, s_mask, a_mask;
TempOptInfo *t1, *t2;
if (fold_const2_commutative(ctx, op) ||
@ -2274,9 +2274,15 @@ static bool fold_or(OptContext *ctx, TCGOp *op)
t1 = arg_info(op->args[1]);
t2 = arg_info(op->args[2]);
z_mask = t1->z_mask | t2->z_mask;
o_mask = t1->o_mask | t2->o_mask;
s_mask = t1->s_mask & t2->s_mask;
return fold_masks_zs(ctx, op, z_mask, s_mask);
/* Affected bits are those not known one, masked by those known zero. */
a_mask = ~t1->o_mask & t2->z_mask;
return fold_masks_zosa(ctx, op, z_mask, o_mask, s_mask, a_mask);
}
static bool fold_orc(OptContext *ctx, TCGOp *op)