From cde4ade314a52a02c66a98404434842b82138d2e Mon Sep 17 00:00:00 2001 From: Alkis Evlogimenos Date: Tue, 17 Feb 2004 04:33:18 +0000 Subject: Add API to check and fold memory operands into instructions. llvm-svn: 11519 --- llvm/lib/Target/X86/X86RegisterInfo.cpp | 81 +++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) (limited to 'llvm/lib/Target/X86/X86RegisterInfo.cpp') diff --git a/llvm/lib/Target/X86/X86RegisterInfo.cpp b/llvm/lib/Target/X86/X86RegisterInfo.cpp index 59be5fb7c43..01a3f07d408 100644 --- a/llvm/lib/Target/X86/X86RegisterInfo.cpp +++ b/llvm/lib/Target/X86/X86RegisterInfo.cpp @@ -79,6 +79,87 @@ int X86RegisterInfo::copyRegToReg(MachineBasicBlock &MBB, return 1; } +bool X86RegisterInfo::canFoldMemoryOperand(MachineInstr* MI, + unsigned i) const +{ + switch(MI->getOpcode()) { + case X86::ADDrr8: case X86::ADDrr16: case X86::ADDrr32: + case X86::ADDri8: case X86::ADDri16: case X86::ADDri32: + case X86::MOVrr8: case X86::MOVrr16: case X86::MOVrr32: + return true; + default: + return false; + } +} + +int X86RegisterInfo::foldMemoryOperand(MachineInstr* MI, + unsigned i, + int FrameIndex) const +{ + MachineBasicBlock& MBB = *MI->getParent(); + MachineInstr* NI = 0; + if (i == 0) + switch(MI->getOpcode()) { + case X86::MOVrr8: + NI = addFrameReference(BuildMI(X86::MOVmr8, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::MOVrr16: + NI = addFrameReference(BuildMI(X86::MOVmr16, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::MOVrr32: + NI = addFrameReference(BuildMI(X86::MOVmr32, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::ADDrr8: + NI = addFrameReference(BuildMI(X86::ADDmr8, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::ADDrr16: + NI = addFrameReference(BuildMI(X86::ADDmr16, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::ADDrr32: + NI = addFrameReference(BuildMI(X86::ADDmr32, 5), FrameIndex).addReg(MI->getOperand(1).getReg()); + break; + case X86::ADDri8: + NI = addFrameReference(BuildMI(X86::ADDmi8, 5), FrameIndex).addZImm(MI->getOperand(1).getImmedValue()); + break; + case X86::ADDri16: + NI = addFrameReference(BuildMI(X86::ADDmi16, 5), FrameIndex).addZImm(MI->getOperand(1).getImmedValue()); + break; + case X86::ADDri32: + NI = addFrameReference(BuildMI(X86::ADDmi32, 5), FrameIndex).addZImm(MI->getOperand(1).getImmedValue()); + break; + default: + assert(0 && "Operand cannot be folded"); + } + else if (i == 1) + switch(MI->getOpcode()) { + case X86::MOVrr8: + NI = addFrameReference(BuildMI(X86::MOVrm8, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + case X86::MOVrr16: + NI = addFrameReference(BuildMI(X86::MOVrm16, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + case X86::MOVrr32: + NI = addFrameReference(BuildMI(X86::MOVrm32, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + case X86::ADDrr8: + NI = addFrameReference(BuildMI(X86::ADDrm8, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + case X86::ADDrr16: + NI = addFrameReference(BuildMI(X86::ADDrm16, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + case X86::ADDrr32: + NI = addFrameReference(BuildMI(X86::ADDrm32, 5).addReg(MI->getOperand(0).getReg()), FrameIndex); + break; + default: + assert(0 && "Operand cannot be folded"); + } + else + assert(0 && "Operand cannot be folded"); + + MBB.insert(MBB.erase(MI), NI); + return 0; +} + //===----------------------------------------------------------------------===// // Stack Frame Processing methods //===----------------------------------------------------------------------===// -- cgit v1.2.3