From 074fe9c9ea5e377a2a50ee943e76a2136271760e Mon Sep 17 00:00:00 2001
From: LinesPrower <LinesPrower@gmail.com>
Date: Wed, 3 Jun 2009 13:14:03 +0000
Subject: [PATCH] Implemented jit'ing of floating point compare operations in
 the IL

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3312 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/Core/Src/PowerPC/Jit64IL/IR.cpp   | 21 +++++++++++++++++++
 Source/Core/Core/Src/PowerPC/Jit64IL/IR.h     |  4 ++++
 .../Src/PowerPC/Jit64IL/Jit_FloatingPoint.cpp |  7 ++-----
 3 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/Source/Core/Core/Src/PowerPC/Jit64IL/IR.cpp b/Source/Core/Core/Src/PowerPC/Jit64IL/IR.cpp
index d1503f3b0e..ff31c83c1e 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64IL/IR.cpp
+++ b/Source/Core/Core/Src/PowerPC/Jit64IL/IR.cpp
@@ -257,6 +257,10 @@ InstLoc IRBuilder::FoldZeroOp(unsigned Opcode, unsigned extra) {
 			FRegCache[extra] = EmitZeroOp(LoadFReg, extra);
 		return FRegCache[extra];
 	}
+	if (Opcode == LoadFRegDENToZero) {
+		// cant use cache here
+		return EmitZeroOp(LoadFRegDENToZero, extra);
+	}
 	if (Opcode == LoadCarry) {
 		if (!CarryCache)
 			CarryCache = EmitZeroOp(LoadCarry, extra);
@@ -1313,6 +1317,7 @@ static void DoWriteCode(IRBuilder* ibuild, Jit64* Jit, bool UseProfile) {
 		case LoadCTR:
 		case LoadMSR:
 		case LoadFReg:
+		case LoadFRegDENToZero:
 		case LoadGQR:
 		case BlockEnd:
 		case BlockStart:
@@ -1981,6 +1986,22 @@ static void DoWriteCode(IRBuilder* ibuild, Jit64* Jit, bool UseProfile) {
 			Jit->MOVAPD(reg, M(&PowerPC::ppcState.ps[ppcreg]));
 			RI.fregs[reg] = I;
 			break;
+		}	    
+		case LoadFRegDENToZero: {
+			if (!thisUsed) break;
+			X64Reg reg = fregFindFreeReg(RI);
+			unsigned ppcreg = *I >> 8;
+			char *p = (char*)&(PowerPC::ppcState.ps[ppcreg][0]);
+			Jit->MOV(32, R(ECX), M(p+4));
+			Jit->AND(32, R(ECX), Imm32(0x7ff00000));
+			Jit->CMP(32, R(ECX), Imm32(0x38000000));
+			FixupBranch ok = Jit->J_CC(CC_AE);
+			Jit->AND(32, M(p+4), Imm32(0x80000000));
+			Jit->MOV(32, M(p), Imm32(0));
+			Jit->SetJumpTarget(ok);
+			Jit->MOVAPD(reg, M(&PowerPC::ppcState.ps[ppcreg]));
+			RI.fregs[reg] = I;
+			break;
 		}
 		case StoreFReg: {
 			unsigned ppcreg = *I >> 16;
diff --git a/Source/Core/Core/Src/PowerPC/Jit64IL/IR.h b/Source/Core/Core/Src/PowerPC/Jit64IL/IR.h
index 6ed1118ab2..e3f335228e 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64IL/IR.h
+++ b/Source/Core/Core/Src/PowerPC/Jit64IL/IR.h
@@ -119,6 +119,7 @@ namespace IREmitter {
 		ExpandPackedToMReg,
 		CompactMRegToPacked,
 		LoadFReg,
+		LoadFRegDENToZero,
 		FSMul,
 		FSAdd,
 		FSSub,
@@ -411,6 +412,9 @@ namespace IREmitter {
 		InstLoc EmitLoadFReg(unsigned freg) {
 			return FoldZeroOp(LoadFReg, freg);
 		}
+		InstLoc EmitLoadFRegDENToZero(unsigned freg) {
+			return FoldZeroOp(LoadFRegDENToZero, freg);
+		}
 		InstLoc EmitStoreFReg(InstLoc val, unsigned freg) {
 			return FoldUOp(StoreFReg, val, freg);
 		}
diff --git a/Source/Core/Core/Src/PowerPC/Jit64IL/Jit_FloatingPoint.cpp b/Source/Core/Core/Src/PowerPC/Jit64IL/Jit_FloatingPoint.cpp
index 30d3a749fb..9fe28e2dd9 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64IL/Jit_FloatingPoint.cpp
+++ b/Source/Core/Core/Src/PowerPC/Jit64IL/Jit_FloatingPoint.cpp
@@ -102,14 +102,11 @@
 
 	void Jit64::fcmpx(UGeckoInstruction inst)
 	{
-		// @TODO: conform this to the new fcmpo
-		Default(inst); return;
-
 		INSTRUCTION_START
 		JITDISABLE(FloatingPoint)
 		IREmitter::InstLoc lhs, rhs, res;
-		lhs = ibuild.EmitLoadFReg(inst.FA);
-		rhs = ibuild.EmitLoadFReg(inst.FB);
+		lhs = ibuild.EmitLoadFRegDENToZero(inst.FA);
+		rhs = ibuild.EmitLoadFRegDENToZero(inst.FB);
 		res = ibuild.EmitFDCmpCR(lhs, rhs);
 		ibuild.EmitStoreFPRF(res);
 		ibuild.EmitStoreCR(res, inst.CRFD);