From 32a67ef2649dba100a84f7db971f12691fee80ad Mon Sep 17 00:00:00 2001
From: Fiora <fioraaeterna@gmail.com>
Date: Sat, 6 Sep 2014 12:54:24 -0700
Subject: [PATCH] JIT: fix memcheck on float load/store, plus some corner cases

---
 .../PowerPC/Jit64/Jit_LoadStoreFloating.cpp   | 30 +++++++++++++++----
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/Source/Core/Core/PowerPC/Jit64/Jit_LoadStoreFloating.cpp b/Source/Core/Core/PowerPC/Jit64/Jit_LoadStoreFloating.cpp
index 8090c2499e..4e35c13caa 100644
--- a/Source/Core/Core/PowerPC/Jit64/Jit_LoadStoreFloating.cpp
+++ b/Source/Core/Core/PowerPC/Jit64/Jit_LoadStoreFloating.cpp
@@ -27,13 +27,18 @@ void Jit64::lfXXX(UGeckoInstruction inst)
 	int a = inst.RA;
 	int b = inst.RB;
 
-	FALLBACK_IF(!indexed && !a);
+	FALLBACK_IF((!indexed && !a) || (update && a == d));
 
 	if (update)
 		gpr.BindToRegister(a, true, true);
 
 	s32 offset = 0;
 	OpArg addr = gpr.R(a);
+	if (update && js.memcheck)
+	{
+		addr = R(RSCRATCH2);
+		MOV(32, addr, gpr.R(a));
+	}
 	if (indexed)
 	{
 		if (update)
@@ -58,10 +63,13 @@ void Jit64::lfXXX(UGeckoInstruction inst)
 		if (update)
 			ADD(32, addr, Imm32((s32)(s16)inst.SIMM_16));
 		else
-			offset = (s32)(s16)inst.SIMM_16;
+			offset = (s16)inst.SIMM_16;
 	}
 
-	SafeLoadToReg(RSCRATCH, addr, single ? 32 : 64, offset, CallerSavedRegistersInUse(), false);
+	u32 registersInUse = CallerSavedRegistersInUse();
+	if (update && js.memcheck)
+		registersInUse |= (1 << RSCRATCH2);
+	SafeLoadToReg(RSCRATCH, addr, single ? 32 : 64, offset, registersInUse, false);
 	fpr.Lock(d);
 	fpr.BindToRegister(d, js.memcheck || !single);
 
@@ -75,6 +83,8 @@ void Jit64::lfXXX(UGeckoInstruction inst)
 		MOVQ_xmm(XMM0, R(RSCRATCH));
 		MOVSD(fpr.RX(d), R(XMM0));
 	}
+	if (update && js.memcheck)
+		MOV(32, gpr.R(a), addr);
 	MEMCHECK_END
 	fpr.UnlockAll();
 	gpr.UnlockAll();
@@ -93,9 +103,10 @@ void Jit64::stfXXX(UGeckoInstruction inst)
 	int a = inst.RA;
 	int b = inst.RB;
 
-	FALLBACK_IF(!indexed && !a);
+	FALLBACK_IF((!indexed && !a) || (update && (a == s || a == b)));
 
 	s32 offset = 0;
+	s32 imm = (s16)inst.SIMM_16;
 	if (indexed)
 	{
 		if (update)
@@ -121,11 +132,11 @@ void Jit64::stfXXX(UGeckoInstruction inst)
 		if (update)
 		{
 			gpr.BindToRegister(a, true, true);
-			ADD(32, gpr.R(a), Imm32((s32)(s16)inst.SIMM_16));
+			ADD(32, gpr.R(a), Imm32(imm));
 		}
 		else
 		{
-			offset = (s32)(s16)inst.SIMM_16;
+			offset = imm;
 		}
 		MOV(32, R(RSCRATCH2), gpr.R(a));
 	}
@@ -145,6 +156,13 @@ void Jit64::stfXXX(UGeckoInstruction inst)
 			MOV(64, R(RSCRATCH), fpr.R(s));
 		SafeWriteRegToReg(RSCRATCH, RSCRATCH2, 64, offset, CallerSavedRegistersInUse());
 	}
+	if (js.memcheck && update)
+	{
+		// revert the address change if an exception occurred
+		MEMCHECK_START(true)
+		SUB(32, gpr.R(a), indexed ? gpr.R(b) : Imm32(imm));
+		MEMCHECK_END
+	}
 	gpr.UnlockAll();
 	gpr.UnlockAllX();
 }