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tcg/optimize: Canonicalize subi to addi during optimization 

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>
master
Richard Henderson 2023-10-25 18:39:43 -07:00
parent 1551004eeb
commit 6334a968ee
1 changed files with 13 additions and 1 deletions
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14
tcg/optimize.c
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@ -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)