add support for using vxor to build zero vectors. This implements
Regression/CodeGen/PowerPC/vec_zero.ll
llvm-svn: 27059
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
index abf7a79..5482e9a 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -101,6 +101,10 @@
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned getVSPLTImmediate(SDNode *N);
+
+ /// isZeroVector - Return true if this build_vector is an all-zero vector.
+ ///
+ bool isZeroVector(SDNode *N);
}
class PPCTargetLowering : public TargetLowering {