motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-01 23:03:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

tcg/optimize: Use fold_masks_zs in fold_bswap

Browse source 
Avoid the use of the OptContext slots.  Find TempOptInfo once.
Always set s_mask along the BSWAP_OS path, since the result is
being explicitly sign-extended.

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 19:42:20 -06:00
parent 21e2b5f9fa
commit c1e7b989c8
1 changed files with 10 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

21
tcg/optimize.c
View file

@ -1477,16 +1477,16 @@ static bool fold_brcond2(OptContext *ctx, TCGOp *op)
static bool fold_bswap(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask, s_mask, sign;
TempOptInfo *t1 = arg_info(op->args[1]);
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
t = do_constant_folding(op->opc, ctx->type, t, op->args[2]);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
if (ti_is_const(t1)) {
return tcg_opt_gen_movi(ctx, op, op->args[0],
do_constant_folding(op->opc, ctx->type,
ti_const_val(t1),
op->args[2]));
}
z_mask = arg_info(op->args[1])->z_mask;
z_mask = t1->z_mask;
switch (op->opc) {
case INDEX_op_bswap16_i32:
case INDEX_op_bswap16_i64:
@ -1514,18 +1514,17 @@ static bool fold_bswap(OptContext *ctx, TCGOp *op)
/* If the sign bit may be 1, force all the bits above to 1. */
if (z_mask & sign) {
z_mask |= sign;
s_mask = sign << 1;
}
/* The value and therefore s_mask is explicitly sign-extended. */
s_mask = sign;
break;
default:
/* The high bits are undefined: force all bits above the sign to 1. */
z_mask |= sign << 1;
break;
}
ctx->z_mask = z_mask;
ctx->s_mask = s_mask;
return fold_masks(ctx, op);
return fold_masks_zs(ctx, op, z_mask, s_mask);
}
static bool fold_call(OptContext *ctx, TCGOp *op)