mirrors/qemu
0
0
Fork 0
mirror of https://github.com/qemu/qemu.git synced 2024-12-01 07:43:35 +08:00
Code Issues Packages Projects Releases Wiki Activity

tcg/optimize: Canonicalize subi to addi during optimization

Browse Source 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231026013945.1152174-3-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-10-25 18:39:43 -07:00
parent 1551004eeb
commit 6334a968ee
1 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
tcg/optimize.c
View File

@ -2166,7 +2166,19 @@ static bool fold_sub_vec(OptContext *ctx, TCGOp *op)
static bool fold_sub(OptContext *ctx, TCGOp *op)
{
return fold_const2(ctx, op) || fold_sub_vec(ctx, op);
if (fold_const2(ctx, op) || fold_sub_vec(ctx, op)) {
return true;
}
/* Fold sub r,x,i to add r,x,-i */
if (arg_is_const(op->args[2])) {
uint64_t val = arg_info(op->args[2])->val;
op->opc = (ctx->type == TCG_TYPE_I32
? INDEX_op_add_i32 : INDEX_op_add_i64);
op->args[2] = arg_new_constant(ctx, -val);
}
return false;
}
static bool fold_sub2(OptContext *ctx, TCGOp *op)