diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-09-29 18:52:11 +0200 |
|---|---|---|
| committer | Blue Swirl <blauwirbel@gmail.com> | 2011-10-01 06:42:46 +0000 |
| commit | a4773324b4bc5f15fe9b438e4cfff05e1ab16dfa (patch) | |
| tree | ca5efb7a06cf3f553b339b7a945447ae242ad6b3 /tcg/tcg-op.h | |
| parent | 7e17a217061e402243499d96fc8dec92162d8b4a (diff) | |
| download | qemu-a4773324b4bc5f15fe9b438e4cfff05e1ab16dfa.tar.gz | |
tcg-i386: Introduce limited deposit support
x86 cannot provide an optimized generic deposit implementation. But at
least for a few special cases, namely for writing bits 0..7, 8..15, and
0..15, versions using only a single instruction are feasible.
Introducing such limited support improves emulating 16-bit x86 code on
x86, but also rarer cases where 32-bit or 64-bit code accesses bytes or
words.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'tcg/tcg-op.h')
| -rw-r--r-- | tcg/tcg-op.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h index 404b6376a8..fea5983669 100644 --- a/tcg/tcg-op.h +++ b/tcg/tcg-op.h @@ -2045,7 +2045,7 @@ static inline void tcg_gen_deposit_i32(TCGv_i32 ret, TCGv_i32 arg1, TCGv_i32 arg2, unsigned int ofs, unsigned int len) { - if (TCG_TARGET_HAS_deposit_i32) { + if (TCG_TARGET_HAS_deposit_i32 && TCG_TARGET_deposit_i32_valid(ofs, len)) { tcg_gen_op5ii_i32(INDEX_op_deposit_i32, ret, arg1, arg2, ofs, len); } else { uint32_t mask = (1u << len) - 1; @@ -2064,7 +2064,7 @@ static inline void tcg_gen_deposit_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2, unsigned int ofs, unsigned int len) { - if (TCG_TARGET_HAS_deposit_i64) { + if (TCG_TARGET_HAS_deposit_i64 && TCG_TARGET_deposit_i64_valid(ofs, len)) { tcg_gen_op5ii_i64(INDEX_op_deposit_i64, ret, arg1, arg2, ofs, len); } else { uint64_t mask = (1ull << len) - 1; |