Somehow I lost a condition when I was shuffling some code around. Anyway,
only transform a shufps to pshufd when the first two operands are the same.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28575 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 71504f9..47388ea 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -125,11 +125,11 @@
case X86::SHUFPSrri: {
assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
- if (!Subtarget->hasSSE2()) return 0;
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 (!Subtarget->hasSSE2() || B != C) return 0;
return BuildMI(X86::PSHUFDri, 2, A).addReg(B).addImm(M);
}
}