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authorRichard Henderson <rth@twiddle.net>2012-09-21 17:18:12 -0700
committerAurelien Jarno <aurelien@aurel32.net>2012-09-26 00:31:16 +0200
commit6f3bb33eaa79570b7009f3704ca55c4f8296219f (patch)
tree1eb08a9dd6862c11368f7158e9bcc6e17d9e8c4f
parentd81ada7fa43e588a24856da4bfcdcac020d8e25b (diff)
downloadqemu-arm-6f3bb33eaa79570b7009f3704ca55c4f8296219f.tar.gz
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>
-rw-r--r--tcg/tcg-op.h19
1 files changed, 15 insertions, 4 deletions
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index fd1649996c..bcfb60b507 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)