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tcg/optimize: Use fold_masks_zs in fold_count_zeros

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Avoid the use of the OptContext slots. Find TempOptInfo once.
Compute s_mask from the union of the maximum count and the
op2 fallback for op1 being zero.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-08 19:47:51 -06:00
parent c1e7b989c8
commit ce1d663ff8
1 changed files with 10 additions and 5 deletions
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15
tcg/optimize.c
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@ -1566,10 +1566,12 @@ static bool fold_call(OptContext *ctx, TCGOp *op)
static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask;
uint64_t z_mask, s_mask;
TempOptInfo *t1 = arg_info(op->args[1]);
TempOptInfo *t2 = arg_info(op->args[2]);
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
if (ti_is_const(t1)) {
uint64_t t = ti_const_val(t1);
if (t != 0) {
t = do_constant_folding(op->opc, ctx->type, t, 0);
@ -1588,8 +1590,11 @@ static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
default:
g_assert_not_reached();
}
ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask;
return false;
s_mask = ~z_mask;
z_mask |= t2->z_mask;
s_mask &= t2->s_mask;
return fold_masks_zs(ctx, op, z_mask, s_mask);
}
static bool fold_ctpop(OptContext *ctx, TCGOp *op)