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| author | Richard Henderson <richard.henderson@linaro.org> | 2023-10-25 18:39:43 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2023-11-06 10:43:04 -0800 |
| commit | 6334a968eec3f2498a992a7b96c1bfcaf100066f (patch) | |
| tree | dc588df9e807756600cf0c4892b705cd18af02d6 /tcg/optimize.c | |
| parent | 1551004eeb4436a163472c3b5b108a60766e74cb (diff) | |
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>
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) |