From 99ffecd6754c1217c71efa084291a4da1057a1d2 Mon Sep 17 00:00:00 2001
From: "dok.slade" <dok.slade@gmail.com>
Date: Mon, 26 Jul 2010 23:06:34 +0000
Subject: [PATCH] Merge JIT instructions when loading 32-bits immediate values
 : PowerPC needs 2 instructions to load a 32-bits immediate value in a
 register (lis + addi; lis + ori). We can merge both instructions into a
 single SetImmediate(). This commit shares code with r5799, so to prevent
 another flame war on OSX vs Windows, I added #ifdef around the "bad" lines...

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5982 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp    |  6 ++++
 Source/Core/Core/Src/PowerPC/Jit64/Jit.h      |  1 +
 .../Core/Src/PowerPC/Jit64/Jit_Integer.cpp    | 35 ++++++++++++++++++-
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp b/Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp
index c911b5f1c3..9023ce3c18 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp
+++ b/Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp
@@ -502,6 +502,7 @@ const u8* Jit64::DoJit(u32 em_address, PPCAnalyst::CodeBuffer *code_buf, JitBloc
 	if (!SConfig::GetInstance().m_LocalCoreStartupParameter.bEnableDebugging)
 		js.downcountAmount = js.st.numCycles + PatchEngine::GetSpeedhackCycles(em_address);
 
+	js.skipnext = false;
 	js.blockSize = size;
 	// Translate instructions
 	for (int i = 0; i < (int)size; i++)
@@ -549,6 +550,11 @@ const u8* Jit64::DoJit(u32 em_address, PPCAnalyst::CodeBuffer *code_buf, JitBloc
 		}
 #endif
 
+		if (js.skipnext) {
+			js.skipnext = false;
+			i++; // Skip next instruction
+		}
+		
 		if (js.cancel)
 			break;
 	}
diff --git a/Source/Core/Core/Src/PowerPC/Jit64/Jit.h b/Source/Core/Core/Src/PowerPC/Jit64/Jit.h
index 5e3161cb76..ec5c9e1ac0 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64/Jit.h
+++ b/Source/Core/Core/Src/PowerPC/Jit64/Jit.h
@@ -61,6 +61,7 @@ private:
 		u32 next_compilerPC;
 		u32 blockStart;
 		bool cancel;
+		bool skipnext;
 		UGeckoInstruction next_inst;  // for easy peephole opt.
 		int blockSize;
 		int instructionNumber;
diff --git a/Source/Core/Core/Src/PowerPC/Jit64/Jit_Integer.cpp b/Source/Core/Core/Src/PowerPC/Jit64/Jit_Integer.cpp
index 8b7e03a440..a543e9a520 100644
--- a/Source/Core/Core/Src/PowerPC/Jit64/Jit_Integer.cpp
+++ b/Source/Core/Core/Src/PowerPC/Jit64/Jit_Integer.cpp
@@ -91,8 +91,11 @@ void Jit64::regimmop(int d, int a, bool binary, u32 value, Operation doop, void
 	{
 		// a == 0, which for these instructions imply value = 0
 		gpr.SetImmediate32(d, value);
+#ifdef __APPLE__
 // XXX soren
+		// FIXME: Seems to be required on OS X (see r5799)
 		gpr.StoreFromX64(d);
+#endif
 	}
 	else
 	{
@@ -126,7 +129,37 @@ void Jit64::reg_imm(UGeckoInstruction inst)
 			regimmop(d, a, false, (u32)(s32)inst.SIMM_16,  Add, &XEmitter::ADD); //addi
 		}
 		break;
-	case 15: regimmop(d, a, false, (u32)inst.SIMM_16 << 16, Add, &XEmitter::ADD); break; //addis
+	case 15:
+		if (a == 0) {	// lis
+			// Merge with next instruction if loading a 32-bits immediate value (lis + addi, lis + ori)
+			if (!js.isLastInstruction) {
+				if ((js.next_inst.OPCD == 14) && (js.next_inst.RD == d) && (js.next_inst.RA == d)) {      // addi
+					gpr.SetImmediate32(d, ((u32)inst.SIMM_16 << 16) + (u32)(s32)js.next_inst.SIMM_16);
+#ifdef __APPLE__
+					// FIXME: Seems to be required on OS X (see r5799)
+					gpr.StoreFromX64(d);
+#endif
+					js.skipnext = true;
+					break;
+				}
+				else if ((js.next_inst.OPCD == 24) && (js.next_inst.RA == d) && (js.next_inst.RS == d))	{ // ori
+					gpr.SetImmediate32(d, ((u32)inst.SIMM_16 << 16) | (u32)js.next_inst.UIMM);
+#ifdef __APPLE__
+					// FIXME: Seems to be required on OS X (see r5799)
+					gpr.StoreFromX64(d);
+#endif
+					js.skipnext = true;
+					break;
+				}
+			}
+
+			// Not merged
+			regimmop(d, a, false, (u32)inst.SIMM_16 << 16, Add, &XEmitter::ADD);
+		}
+		else {	// addis
+			regimmop(d, a, false, (u32)inst.SIMM_16 << 16, Add, &XEmitter::ADD);
+		}
+		break;
 	case 24: 
 		if (a == 0 && s == 0 && inst.UIMM == 0 && !inst.Rc)  //check for nop
 		{NOP(); return;} //make the nop visible in the generated code. not much use but interesting if we see one.