diff options
Diffstat (limited to 'tcg/optimize.c')
| -rw-r--r-- | tcg/optimize.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index d8e437c826..468f827399 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -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) |