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| 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.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.h')
| -rw-r--r-- | tcg/tcg.h | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -81,6 +81,13 @@ typedef uint64_t TCGRegSet; #define TCG_TARGET_HAS_deposit_i64 0 #endif +#ifndef TCG_TARGET_deposit_i32_valid +#define TCG_TARGET_deposit_i32_valid(ofs, len) 1 +#endif +#ifndef TCG_TARGET_deposit_i64_valid +#define TCG_TARGET_deposit_i64_valid(ofs, len) 1 +#endif + /* Only one of DIV or DIV2 should be defined. */ #if defined(TCG_TARGET_HAS_div_i32) #define TCG_TARGET_HAS_div2_i32 0 |