diff options
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 25 | ||||
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.h | 3 |
2 files changed, 28 insertions, 0 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index 732b8cf248..7b8d188b2c 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -92,6 +92,31 @@ void X86RegisterInfo::copyRegToReg(MachineBasicBlock &MBB, BuildMI(MBB, MI, Opc, 1, DestReg).addReg(SrcReg); } +unsigned X86RegisterInfo::isLoadFromStackSlot(MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case X86::MOV8rm: + case X86::MOV16rm: + case X86::MOV32rm: + case X86::FLD64m: + case X86::FLD80m: + case X86::MOVAPDrm: + case X86::MOVSDrm: + if (MI->getOperand(1).isFrameIndex() && MI->getOperand(2).isImmediate() && + MI->getOperand(3).isRegister() && MI->getOperand(4).isImmediate() && + MI->getOperand(2).getImmedValue() == 1 && + MI->getOperand(3).getReg() == 0 && + MI->getOperand(4).getImmedValue() == 0) { + FrameIndex = MI->getOperand(1).getFrameIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + return 0; +} + + static MachineInstr *MakeMInst(unsigned Opcode, unsigned FrameIndex, MachineInstr *MI) { return addFrameReference(BuildMI(Opcode, 4), FrameIndex); diff --git a/lib/Target/X86/X86RegisterInfo.h b/lib/Target/X86/X86RegisterInfo.h index 8da92f6bb0..a84be1711b 100644 --- a/lib/Target/X86/X86RegisterInfo.h +++ b/lib/Target/X86/X86RegisterInfo.h @@ -39,6 +39,9 @@ struct X86RegisterInfo : public X86GenRegisterInfo { unsigned DestReg, unsigned SrcReg, const TargetRegisterClass *RC) const; + unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const; + + /// foldMemoryOperand - If this target supports it, fold a load or store of /// the specified stack slot into the specified machine instruction for the /// specified operand. If this is possible, the target should perform the |