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| author | Richard Henderson <richard.henderson@linaro.org> | 2023-10-25 18:39:42 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2023-11-06 10:43:04 -0800 |
| commit | 1551004eeb4436a163472c3b5b108a60766e74cb (patch) | |
| tree | d41dad8e8f3bbde8d1942434078782c3e4f94e7d /tcg/tcg-op.c | |
| parent | 26aac97c849f28e23bc818035bac38be34e62983 (diff) | |
| download | qemu-1551004eeb4436a163472c3b5b108a60766e74cb.zip qemu-1551004eeb4436a163472c3b5b108a60766e74cb.tar.gz qemu-1551004eeb4436a163472c3b5b108a60766e74cb.tar.bz2 | |
tcg: Canonicalize subi to addi during opcode generation
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231026013945.1152174-2-richard.henderson@linaro.org>
Diffstat (limited to 'tcg/tcg-op.c')
| -rw-r--r-- | tcg/tcg-op.c | 18 |
1 files changed, 2 insertions, 16 deletions
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c index de096a6..aa6bc6f 100644 --- a/tcg/tcg-op.c +++ b/tcg/tcg-op.c @@ -372,12 +372,7 @@ void tcg_gen_subfi_i32(TCGv_i32 ret, int32_t arg1, TCGv_i32 arg2) void tcg_gen_subi_i32(TCGv_i32 ret, TCGv_i32 arg1, int32_t arg2) { - /* some cases can be optimized here */ - if (arg2 == 0) { - tcg_gen_mov_i32(ret, arg1); - } else { - tcg_gen_sub_i32(ret, arg1, tcg_constant_i32(arg2)); - } + tcg_gen_addi_i32(ret, arg1, -arg2); } void tcg_gen_neg_i32(TCGv_i32 ret, TCGv_i32 arg) @@ -1752,16 +1747,7 @@ void tcg_gen_subfi_i64(TCGv_i64 ret, int64_t arg1, TCGv_i64 arg2) void tcg_gen_subi_i64(TCGv_i64 ret, TCGv_i64 arg1, int64_t arg2) { - /* some cases can be optimized here */ - if (arg2 == 0) { - tcg_gen_mov_i64(ret, arg1); - } else if (TCG_TARGET_REG_BITS == 64) { - tcg_gen_sub_i64(ret, arg1, tcg_constant_i64(arg2)); - } else { - tcg_gen_sub2_i32(TCGV_LOW(ret), TCGV_HIGH(ret), - TCGV_LOW(arg1), TCGV_HIGH(arg1), - tcg_constant_i32(arg2), tcg_constant_i32(arg2 >> 32)); - } + tcg_gen_addi_i64(ret, arg1, -arg2); } void tcg_gen_neg_i64(TCGv_i64 ret, TCGv_i64 arg) |