diff options
Diffstat (limited to 'lib/Target/X86/X86InstrInfo.cpp')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index a13498e3ae..9d304b52db 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -121,6 +121,26 @@ MachineInstr *X86InstrInfo::convertToThreeAddress(MachineInstr *MI) const { return 0; } +/// commuteInstruction - We have a few instructions that must be hacked on to +/// commute them. +/// +MachineInstr *X86InstrInfo::commuteInstruction(MachineInstr *MI) const { + switch (MI->getOpcode()) { + case X86::SHRD32rri8: // A = SHRD32rri8 B, C, I -> A = SHLD32rri8 C, B, (32-I) + case X86::SHLD32rri8:{// A = SHLD32rri8 B, C, I -> A = SHRD32rri8 C, B, (32-I) + unsigned Amt = MI->getOperand(3).getImmedValue(); + unsigned A = MI->getOperand(0).getReg(); + unsigned B = MI->getOperand(1).getReg(); + unsigned C = MI->getOperand(2).getReg(); + unsigned Opc = X86::SHRD32rri8; + if (MI->getOpcode() == X86::SHRD32rri8) Opc = X86::SHLD32rri8; + return BuildMI(Opc, 3, A).addReg(B).addReg(C).addImm(32-Amt); + } + default: + return TargetInstrInfo::commuteInstruction(MI); + } +} + void X86InstrInfo::insertGoto(MachineBasicBlock& MBB, MachineBasicBlock& TMBB) const { |