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tcg/optimize: Build and use o_bits in fold_sextract

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This was the last use of fold_affected_mask,
now fully replaced by fold_masks_zosa.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-10 16:40:24 -06:00
parent 08d676a46b
commit f4a818a08d
1 changed files with 6 additions and 24 deletions
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30
tcg/optimize.c
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@ -1121,22 +1121,6 @@ static bool fold_masks_s(OptContext *ctx, TCGOp *op, uint64_t s_mask)
return fold_masks_zosa(ctx, op, -1, 0, s_mask, -1);
}
/*
* An "affected" mask bit is 0 if and only if the result is identical
* to the first input. Thus if the entire mask is 0, the operation
* is equivalent to a copy.
*/
static bool fold_affected_mask(OptContext *ctx, TCGOp *op, uint64_t a_mask)
{
if (ctx->type == TCG_TYPE_I32) {
a_mask = (uint32_t)a_mask;
}
if (a_mask == 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
return false;
}
/*
* Convert @op to NOT, if NOT is supported by the host.
* Return true f the conversion is successful, which will still
@ -2669,7 +2653,7 @@ static bool fold_setcond2(OptContext *ctx, TCGOp *op)
static bool fold_sextract(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask, s_mask, s_mask_old;
uint64_t z_mask, o_mask, s_mask, a_mask;
TempOptInfo *t1 = arg_info(op->args[1]);
int pos = op->args[2];
int len = op->args[3];
@ -2679,16 +2663,14 @@ static bool fold_sextract(OptContext *ctx, TCGOp *op)
sextract64(ti_const_val(t1), pos, len));
}
s_mask_old = t1->s_mask;
s_mask = s_mask_old >> pos;
s_mask = t1->s_mask >> pos;
s_mask |= -1ull << (len - 1);
if (pos == 0 && fold_affected_mask(ctx, op, s_mask & ~s_mask_old)) {
return true;
}
a_mask = pos ? -1 : s_mask & ~t1->s_mask;
z_mask = sextract64(t1->z_mask, pos, len);
return fold_masks_zs(ctx, op, z_mask, s_mask);
o_mask = sextract64(t1->o_mask, pos, len);
return fold_masks_zosa(ctx, op, z_mask, o_mask, s_mask, a_mask);
}
static bool fold_shift(OptContext *ctx, TCGOp *op)