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tcg/optimize: Use fold_masks_zs in fold_and

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Avoid the use of the OptContext slots.  Find TempOptInfo once.
Sink mask computation below fold_affected_mask early exit.

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 18:47:15 -06:00
parent e1b6c141e9
commit 1ca7372c03
1 changed files with 16 additions and 14 deletions
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30
tcg/optimize.c
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@ -1294,7 +1294,8 @@ static bool fold_add2(OptContext *ctx, TCGOp *op)
static bool fold_and(OptContext *ctx, TCGOp *op)
{
uint64_t z1, z2;
uint64_t z1, z2, z_mask, s_mask;
TempOptInfo *t1, *t2;
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_i(ctx, op, 0) ||
@ -1303,27 +1304,28 @@ static bool fold_and(OptContext *ctx, TCGOp *op)
return true;
}
z1 = arg_info(op->args[1])->z_mask;
z2 = arg_info(op->args[2])->z_mask;
ctx->z_mask = z1 & z2;
/*
* Sign repetitions are perforce all identical, whether they are 1 or 0.
* Bitwise operations preserve the relative quantity of the repetitions.
*/
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
t1 = arg_info(op->args[1]);
t2 = arg_info(op->args[2]);
z1 = t1->z_mask;
z2 = t2->z_mask;
/*
* Known-zeros does not imply known-ones. Therefore unless
* arg2 is constant, we can't infer affected bits from it.
*/
if (arg_is_const(op->args[2]) &&
fold_affected_mask(ctx, op, z1 & ~z2)) {
if (ti_is_const(t2) && fold_affected_mask(ctx, op, z1 & ~z2)) {
return true;
}
return fold_masks(ctx, op);
z_mask = z1 & z2;
/*
* Sign repetitions are perforce all identical, whether they are 1 or 0.
* Bitwise operations preserve the relative quantity of the repetitions.
*/
s_mask = t1->s_mask & t2->s_mask;
return fold_masks_zs(ctx, op, z_mask, s_mask);
}
static bool fold_andc(OptContext *ctx, TCGOp *op)