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Merge pull request #4151 from phire/fix_lswx

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Fix bug in interpreter's lswx. Was overwriting extra register.
This commit is contained in:
Scott Mansell 2016-08-29 23:10:23 +12:00 committed by GitHub
commit c4786ad70e
1 changed files with 17 additions and 27 deletions
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44
Source/Core/Core/PowerPC/Interpreter/Interpreter_LoadStore.cpp
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@ -497,39 +497,29 @@ void Interpreter::lhzx(UGeckoInstruction _inst)
}
}
// TODO: is this right?
// FIXME: Should rollback if a DSI occurs
void Interpreter::lswx(UGeckoInstruction _inst)
{
u32 EA = Helper_Get_EA_X(_inst);
u32 n = (u8)PowerPC::ppcState.xer_stringctrl;
int r = _inst.RD;
int i = 0;
if (n > 0)
// Confirmed by hardware test that the zero case doesn't zero rGPR[r]
for (u32 n = 0; n < static_cast<u8>(PowerPC::ppcState.xer_stringctrl); n++)
{
rGPR[r] = 0;
do
{
u32 TempValue = PowerPC::Read_U8(EA) << (24 - i);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in lswx.");
NOTICE_LOG(POWERPC, "DSI exception in lswx");
return;
}
rGPR[r] |= TempValue;
int reg = (_inst.RD + (n >> 2)) & 0x1f;
int offset = (n & 3) << 3;
if ((n & 3) == 0)
rGPR[reg] = 0;
EA++;
n--;
i += 8;
if (i == 32)
{
i = 0;
r = (r + 1) & 31;
rGPR[r] = 0;
}
} while (n > 0);
u32 TempValue = PowerPC::Read_U8(EA) << (24 - offset);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in lswx.");
NOTICE_LOG(POWERPC, "DSI exception in lswx");
return;
}
rGPR[reg] |= TempValue;
EA++;
}
}
@ -740,7 +730,7 @@ void Interpreter::stswx(UGeckoInstruction _inst)
if (i == 32)
{
i = 0;
r++;
r = (r + 1) & 0x1f; // wrap
}
}
}