Commute shufps / shufpd.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28577 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 47388ea..c566b48 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -207,6 +207,24 @@
///
MachineInstr *X86InstrInfo::commuteInstruction(MachineInstr *MI) const {
switch (MI->getOpcode()) {
+ case X86::SHUFPSrri: { // A = SHUFPSrri B,C, M -> A = SHUFPSrri C,B, rotl(M,4)
+ unsigned A = MI->getOperand(0).getReg();
+ unsigned B = MI->getOperand(1).getReg();
+ unsigned C = MI->getOperand(2).getReg();
+ unsigned M = MI->getOperand(3).getImmedValue();
+ if (B == C) return 0;
+ return BuildMI(X86::SHUFPSrri, 3, A).addReg(C).addReg(B).
+ addImm(((M & 0xF) << 4) | ((M & 0xF0) >> 4));
+ }
+ case X86::SHUFPDrri: { // A = SHUFPDrri B,C, M -> A = SHUFPDrri C,B, rotl(M,1)
+ unsigned A = MI->getOperand(0).getReg();
+ unsigned B = MI->getOperand(1).getReg();
+ unsigned C = MI->getOperand(2).getReg();
+ unsigned M = MI->getOperand(3).getImmedValue();
+ if (B == C) return 0;
+ return BuildMI(X86::SHUFPDrri, 3, A).addReg(C).addReg(B).
+ addImm(((M & 0x1) << 1) | ((M & 0x2) >> 1));
+ }
case X86::SHRD16rri8: // A = SHRD16rri8 B, C, I -> A = SHLD16rri8 C, B, (16-I)
case X86::SHLD16rri8: // A = SHLD16rri8 B, C, I -> A = SHRD16rri8 C, B, (16-I)
case X86::SHRD32rri8: // A = SHRD32rri8 B, C, I -> A = SHLD32rri8 C, B, (32-I)