Fixed a significant bug where unpcklpd is incorrectly used to extract element 1 from a v2f64 value.
llvm-svn: 31228
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index fb2b92a..d442a18 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -2868,6 +2868,17 @@
return ::isSplatMask(N);
}
+/// isSplatLoMask - Return true if the specified VECTOR_SHUFFLE operand
+/// specifies a splat of zero element.
+bool X86::isSplatLoMask(SDNode *N) {
+ assert(N->getOpcode() == ISD::BUILD_VECTOR);
+
+ for (unsigned i = 0, e = N->getNumOperands(); i < e; ++i)
+ if (!isUndefOrEqual(N->getOperand(i), 0))
+ return false;
+ return true;
+}
+
/// getShuffleSHUFImmediate - Return the appropriate immediate to shuffle
/// the specified isShuffleMask VECTOR_SHUFFLE mask with PSHUF* and SHUFP*
/// instructions.