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tcg/optimize: Use fold_masks_zs, fold_masks_s in fold_shift

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Avoid the use of the OptContext slots.  Find TempOptInfo once.

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 21:13:41 -06:00
parent baff507e50
commit 4e9ce6a2ec
1 changed files with 14 additions and 13 deletions
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27
tcg/optimize.c
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@ -2531,6 +2531,7 @@ static bool fold_sextract(OptContext *ctx, TCGOp *op)
static bool fold_shift(OptContext *ctx, TCGOp *op)
{
uint64_t s_mask, z_mask, sign;
TempOptInfo *t1, *t2;
if (fold_const2(ctx, op) ||
fold_ix_to_i(ctx, op, 0) ||
@ -2538,17 +2539,18 @@ static bool fold_shift(OptContext *ctx, TCGOp *op)
return true;
}
s_mask = arg_info(op->args[1])->s_mask;
z_mask = arg_info(op->args[1])->z_mask;
t1 = arg_info(op->args[1]);
t2 = arg_info(op->args[2]);
s_mask = t1->s_mask;
z_mask = t1->z_mask;
if (arg_is_const(op->args[2])) {
int sh = arg_info(op->args[2])->val;
ctx->z_mask = do_constant_folding(op->opc, ctx->type, z_mask, sh);
if (ti_is_const(t2)) {
int sh = ti_const_val(t2);
z_mask = do_constant_folding(op->opc, ctx->type, z_mask, sh);
s_mask = do_constant_folding(op->opc, ctx->type, s_mask, sh);
return fold_masks(ctx, op);
return fold_masks_zs(ctx, op, z_mask, s_mask);
}
switch (op->opc) {
@ -2557,23 +2559,22 @@ static bool fold_shift(OptContext *ctx, TCGOp *op)
* Arithmetic right shift will not reduce the number of
* input sign repetitions.
*/
ctx->s_mask = s_mask;
break;
return fold_masks_s(ctx, op, s_mask);
CASE_OP_32_64(shr):
/*
* If the sign bit is known zero, then logical right shift
* will not reduced the number of input sign repetitions.
* will not reduce the number of input sign repetitions.
*/
sign = (s_mask & -s_mask) >> 1;
sign = -s_mask;
if (sign && !(z_mask & sign)) {
ctx->s_mask = s_mask;
return fold_masks_s(ctx, op, s_mask);
}
break;
default:
break;
}
return false;
return finish_folding(ctx, op);
}
static bool fold_sub_to_neg(OptContext *ctx, TCGOp *op)