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Jit64: Check downcount at block exit, not block entry

This commit is contained in:
MerryMage 2018-12-21 21:21:02 +00:00
parent 490dffc791
commit 5236dc31a6
2 changed files with 26 additions and 20 deletions
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42
Source/Core/Core/PowerPC/Jit64/Jit.cpp
View File

@ -442,21 +442,36 @@ void Jit64::JustWriteExit(u32 destination, bool bl, u32 after)
JitBlock::LinkData linkData;
linkData.exitAddress = destination;
linkData.linkStatus = false;
linkData.call = bl;
MOV(32, PPCSTATE(pc), Imm32(destination));
linkData.exitPtrs = GetWritableCodePtr();
if (bl)
CALL(asm_routines.dispatcher);
else
JMP(asm_routines.dispatcher, true);
b->linkData.push_back(linkData);
// Perform downcount flag check, followed by the requested exit
if (bl)
{
FixupBranch do_timing = J_CC(CC_LE, true);
SwitchToFarCode();
SetJumpTarget(do_timing);
CALL(asm_routines.do_timing);
FixupBranch after_fixup = J(true);
SwitchToNearCode();
linkData.exitPtrs = GetWritableCodePtr();
CALL(asm_routines.dispatcher_no_check);
SetJumpTarget(after_fixup);
POP(RSCRATCH);
JustWriteExit(after, false, 0);
}
else
{
J_CC(CC_LE, asm_routines.do_timing);
linkData.exitPtrs = GetWritableCodePtr();
JMP(asm_routines.dispatcher_no_check, true);
}
b->linkData.push_back(linkData);
}
void Jit64::WriteExitDestInRSCRATCH(bool bl, u32 after)
@ -660,16 +675,7 @@ u8* Jit64::DoJit(u32 em_address, JitBlock* b, u32 nextPC)
// TODO: Test if this or AlignCode16 make a difference from GetCodePtr
u8* const start = AlignCode4();
b->checkedEntry = start;
// Downcount flag check. The last block decremented downcounter, and the flag should still be
// available.
FixupBranch skip = J_CC(CC_G);
MOV(32, PPCSTATE(pc), Imm32(js.blockStart));
JMP(asm_routines.do_timing, true); // downcount hit zero - go do_timing.
SetJumpTarget(skip);
u8* const normal_entry = GetWritableCodePtr();
b->normalEntry = normal_entry;
b->normalEntry = start;
// Used to get a trace of the last few blocks before a crash, sometimes VERY useful
if (ImHereDebug)
@ -955,7 +961,7 @@ u8* Jit64::DoJit(u32 em_address, JitBlock* b, u32 nextPC)
LogGeneratedX86(code_block.m_num_instructions, m_code_buffer, start, b);
#endif
return normal_entry;
return start;
}
BitSet8 Jit64::ComputeStaticGQRs(const PPCAnalyst::CodeBlock& cb) const

4
Source/Core/Core/PowerPC/Jit64Common/BlockCache.cpp
View File

@ -15,9 +15,9 @@ JitBlockCache::JitBlockCache(JitBase& jit) : JitBaseBlockCache{jit}
void JitBlockCache::WriteLinkBlock(const JitBlock::LinkData& source, const JitBlock* dest)
{
u8* location = source.exitPtrs;
const u8* address = dest ? dest->checkedEntry : m_jit.GetAsmRoutines()->dispatcher;
const u8* address = dest ? dest->checkedEntry : m_jit.GetAsmRoutines()->dispatcher_no_check;
Gen::XEmitter emit(location);
if (*location == 0xE8)
if (source.call)
{
emit.CALL(address);
}