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[ARM64_DYNAREC] Re-enable weakbarrier for dmb.ishst (#2048)

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Yang Liu 2024-11-20 02:59:43 +08:00 committed by GitHub
parent 4f6a66f9c6
commit 81e4e26dc5
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3 changed files with 31 additions and 9 deletions
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11
docs/USAGE.md
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@ -169,9 +169,14 @@ Define Box64's Dynarec max allowed forward value when building Block.
#### BOX64_DYNAREC_STRONGMEM *
Enable/Disable simulation of Strong Memory model
* 0 : Don't try anything special (Default.)
* 1 : Enable some Memory Barrier when writting to memory (on some MOV opcode) to simulate Strong Memory Model while trying to limit performance impact (Default when libmonobdwgc-2.0.so is loaded)
* 2 : All 1. plus a memory barrier on every write to memory using MOV
* 3 : All 2. plus Memory Barrier when reading from memory and on some SSE/SSE2 opcodes too
* 1 : Enable some memory barriers when writting to memory to simulate the Strong Memory Model in a limited way (Default when libmonobdwgc-2.0.so is loaded)
* 2 : All 1. plus memory barriers on SIMD instructions
* 3 : All 2. plus more memory barriers on a regular basis
#### BOX64_DYNAREC_WEAKBARRIER *
Use weak memory barriers to reduce the performance impact by STRONGMEM
* 0 : Use regular safe barrier (Default.)
* 1 : Use weak barriers to have more performance boost
#### BOX64_DYNAREC_X87DOUBLE *
Force the use of Double for x87 emulation

12
docs/box64.pod
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@ -296,8 +296,16 @@ Define Box64's Dynarec max allowed forward value when building Block.
Enable/Disable simulation of Strong Memory model
* 0 : Don't try anything special (Default.)
* 1 : Enable some Memory Barrier when reading from memory (on some MOV opcode) to simulate Strong Memory Model while trying to limit performance impact (Default when libmonobdwgc-2.0.so is loaded)
* 2 : Enable some Memory Barrier when reading from memory (on some MOV opcode) to simulate Strong Memory Model
* 1 : Enable some memory barriers when writting to memory to simulate the Strong Memory Model in a limited way (Default when libmonobdwgc-2.0.so is loaded)
* 2 : All 1. plus memory barriers on SIMD instructions
* 3 : All 2. plus more memory barriers on a regular basis
=item B<BOX64_DYNAREC_WEAKBARRIER>=I<0|1>
Use weak memory barriers to reduce the performance impact by STRONGMEM
* 0 : Use regular safe barrier (Default.)
* 1 : Use weak barriers to have more performance boost
=item B<BOX64_DYNAREC_X87DOUBLE>=I<0|1>

11
src/dynarec/arm64/dynarec_arm64_helper.h
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@ -60,7 +60,7 @@
*/
#define STRONGMEM_SIMD_WRITE 2 // The level of SIMD memory writes will be tracked
#define STRONGMEM_LAST_WRITE 2 // The level of a barrier before the last guest memory store will be put
#define STRONGMEM_LAST_WRITE 1 // The level of a barrier before the last guest memory store will be put
#define STRONGMEM_SEQ_WRITE 3 // The level of a barrier at every third memory store will be put
#if STEP == 1
@ -165,9 +165,15 @@
do { \
if (box64_dynarec_strongmem >= dyn->insts[ninst].will_write && dyn->smwrite == 0) { \
/* Will write but never written, this is the start of a SEQ, put a barrier. */ \
if (box64_dynarec_weakbarrier) \
DMB_ISHST(); \
else \
DMB_ISH(); \
} else if (box64_dynarec_strongmem >= STRONGMEM_LAST_WRITE && dyn->insts[ninst].last_write) { \
/* Last write, put a barrier */ \
if (box64_dynarec_weakbarrier) \
DMB_ISHST(); \
else \
DMB_ISH(); \
} \
} while (0)
@ -198,6 +204,9 @@
--i; \
if (i >= 0) { \
/* It's a SEQ, put a barrier here. */ \
if (box64_dynarec_weakbarrier) \
DMB_ISHST(); \
else \
DMB_ISH(); \
} \
} \