From dbd73726651dc7a13287626694303a747f9cc86e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 6 May 2003 21:32:22 +0000 Subject: [PATCH] Emit pseudo instructions to indicate that some registers are live on entrance and exit of the function. This fixes bug: Jello/2003-05-06-LivenessClobber.llx and the Fhourstones benchmark git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6010 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/InstSelectSimple.cpp | 11 +++++++++++ lib/Target/X86/X86ISelSimple.cpp | 11 +++++++++++ 2 files changed, 22 insertions(+) diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp index a65a42737ef..3a12d5e2c9c 100644 --- a/lib/Target/X86/InstSelectSimple.cpp +++ b/lib/Target/X86/InstSelectSimple.cpp @@ -78,6 +78,11 @@ namespace { F->getBasicBlockList().push_back(MBBMap[I] = new MachineBasicBlock(I)); BB = &F->front(); + + // Declare that the stack pointer is live on entrance to the function + BuildMI(BB, X86::IMPLICIT_DEF, 0, X86::ESP); + + // Copy incoming arguments off of the stack... LoadArgumentsToVirtualRegs(Fn); // Instruction select everything except PHI nodes @@ -671,13 +676,19 @@ void ISel::visitReturnInst(ReturnInst &I) { case cShort: case cInt: promote32(X86::EAX, ValueRecord(RetReg, RetVal->getType())); + // Declare that EAX is live on exit + BuildMI(BB, X86::IMPLICIT_USE, 1).addReg(X86::EAX); break; case cFP: // Floats & Doubles: Return in ST(0) BuildMI(BB, X86::FpSETRESULT, 1).addReg(RetReg); + // Declare that top-of-stack is live on exit + BuildMI(BB, X86::IMPLICIT_USE, 1).addReg(X86::ST0); break; case cLong: BuildMI(BB, X86::MOVrr32, 1, X86::EAX).addReg(RetReg); BuildMI(BB, X86::MOVrr32, 1, X86::EDX).addReg(RetReg+1); + // Declare that EAX & EDX are live on exit + BuildMI(BB, X86::IMPLICIT_USE, 2).addReg(X86::EAX).addReg(X86::EDX); break; default: visitInstruction(I); diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp index a65a42737ef..3a12d5e2c9c 100644 --- a/lib/Target/X86/X86ISelSimple.cpp +++ b/lib/Target/X86/X86ISelSimple.cpp @@ -78,6 +78,11 @@ namespace { F->getBasicBlockList().push_back(MBBMap[I] = new MachineBasicBlock(I)); BB = &F->front(); + + // Declare that the stack pointer is live on entrance to the function + BuildMI(BB, X86::IMPLICIT_DEF, 0, X86::ESP); + + // Copy incoming arguments off of the stack... LoadArgumentsToVirtualRegs(Fn); // Instruction select everything except PHI nodes @@ -671,13 +676,19 @@ void ISel::visitReturnInst(ReturnInst &I) { case cShort: case cInt: promote32(X86::EAX, ValueRecord(RetReg, RetVal->getType())); + // Declare that EAX is live on exit + BuildMI(BB, X86::IMPLICIT_USE, 1).addReg(X86::EAX); break; case cFP: // Floats & Doubles: Return in ST(0) BuildMI(BB, X86::FpSETRESULT, 1).addReg(RetReg); + // Declare that top-of-stack is live on exit + BuildMI(BB, X86::IMPLICIT_USE, 1).addReg(X86::ST0); break; case cLong: BuildMI(BB, X86::MOVrr32, 1, X86::EAX).addReg(RetReg); BuildMI(BB, X86::MOVrr32, 1, X86::EDX).addReg(RetReg+1); + // Declare that EAX & EDX are live on exit + BuildMI(BB, X86::IMPLICIT_USE, 2).addReg(X86::EAX).addReg(X86::EDX); break; default: visitInstruction(I); -- 2.40.0