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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/i386/tcg-target.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/i386/tcg-target.h')
| -rw-r--r-- | tcg/i386/tcg-target.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h index 5088e47e65..b9c9d4e8ce 100644 --- a/tcg/i386/tcg-target.h +++ b/tcg/i386/tcg-target.h @@ -90,7 +90,7 @@ enum { #define TCG_TARGET_HAS_eqv_i32 0 #define TCG_TARGET_HAS_nand_i32 0 #define TCG_TARGET_HAS_nor_i32 0 -#define TCG_TARGET_HAS_deposit_i32 0 +#define TCG_TARGET_HAS_deposit_i32 1 #if TCG_TARGET_REG_BITS == 64 #define TCG_TARGET_HAS_div2_i64 1 @@ -111,9 +111,14 @@ enum { #define TCG_TARGET_HAS_eqv_i64 0 #define TCG_TARGET_HAS_nand_i64 0 #define TCG_TARGET_HAS_nor_i64 0 -#define TCG_TARGET_HAS_deposit_i64 0 +#define TCG_TARGET_HAS_deposit_i64 1 #endif +#define TCG_TARGET_deposit_i32_valid(ofs, len) \ + (((ofs) == 0 && (len) == 8) || ((ofs) == 8 && (len) == 8) || \ + ((ofs) == 0 && (len) == 16)) +#define TCG_TARGET_deposit_i64_valid TCG_TARGET_deposit_i32_valid + #define TCG_TARGET_HAS_GUEST_BASE /* Note: must be synced with dyngen-exec.h */ |