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| author | Richard Henderson <rth@twiddle.net> | 2012-09-21 17:18:12 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-09-26 00:31:16 +0200 |
| commit | 6f3bb33eaa79570b7009f3704ca55c4f8296219f (patch) | |
| tree | 1eb08a9dd6862c11368f7158e9bcc6e17d9e8c4f /tcg | |
| parent | d81ada7fa43e588a24856da4bfcdcac020d8e25b (diff) | |
| download | qemu-6f3bb33eaa79570b7009f3704ca55c4f8296219f.zip qemu-6f3bb33eaa79570b7009f3704ca55c4f8296219f.tar.gz qemu-6f3bb33eaa79570b7009f3704ca55c4f8296219f.tar.bz2 | |
tcg: Emit XORI as NOT for appropriate constants
Note that xori_i64 failed to perform even the minimal
optimizations promised by the README.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/tcg-op.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h index fd16499..bcfb60b 100644 --- a/tcg/tcg-op.h +++ b/tcg/tcg-op.h @@ -582,9 +582,12 @@ static inline void tcg_gen_xor_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2) static inline void tcg_gen_xori_i32(TCGv_i32 ret, TCGv_i32 arg1, int32_t arg2) { - /* some cases can be optimized here */ + /* Some cases can be optimized here. */ if (arg2 == 0) { tcg_gen_mov_i32(ret, arg1); + } else if (arg2 == -1 && TCG_TARGET_HAS_not_i32) { + /* Don't recurse with tcg_gen_not_i32. */ + tcg_gen_op2_i32(INDEX_op_not_i32, ret, arg1); } else { TCGv_i32 t0 = tcg_const_i32(arg2); tcg_gen_xor_i32(ret, arg1, t0); @@ -1206,9 +1209,17 @@ static inline void tcg_gen_xor_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2) static inline void tcg_gen_xori_i64(TCGv_i64 ret, TCGv_i64 arg1, int64_t arg2) { - TCGv_i64 t0 = tcg_const_i64(arg2); - tcg_gen_xor_i64(ret, arg1, t0); - tcg_temp_free_i64(t0); + /* Some cases can be optimized here. */ + if (arg2 == 0) { + tcg_gen_mov_i64(ret, arg1); + } else if (arg2 == -1 && TCG_TARGET_HAS_not_i64) { + /* Don't recurse with tcg_gen_not_i64. */ + tcg_gen_op2_i64(INDEX_op_not_i64, ret, arg1); + } else { + TCGv_i64 t0 = tcg_const_i64(arg2); + tcg_gen_xor_i64(ret, arg1, t0); + tcg_temp_free_i64(t0); + } } static inline void tcg_gen_shl_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2) |