[PPCVSXFMAMutate] Temporarily disable this pass
llvm-svn: 262573
diff --git a/llvm/lib/Target/PowerPC/PPCVSXFMAMutate.cpp b/llvm/lib/Target/PowerPC/PPCVSXFMAMutate.cpp
index 2de8d79..e3580ca 100644
--- a/llvm/lib/Target/PowerPC/PPCVSXFMAMutate.cpp
+++ b/llvm/lib/Target/PowerPC/PPCVSXFMAMutate.cpp
@@ -38,8 +38,14 @@
using namespace llvm;
-static cl::opt<bool> DisableVSXFMAMutate("disable-ppc-vsx-fma-mutation",
-cl::desc("Disable VSX FMA instruction mutation"), cl::Hidden);
+// Temporarily disable FMA mutation by default, since it doesn't handle
+// cross-basic-block intervals well.
+// See: http://lists.llvm.org/pipermail/llvm-dev/2016-February/095669.html
+// http://reviews.llvm.org/D17087
+static cl::opt<bool> DisableVSXFMAMutate(
+ "disable-ppc-vsx-fma-mutation",
+ cl::desc("Disable VSX FMA instruction mutation"), cl::init(true),
+ cl::Hidden);
#define DEBUG_TYPE "ppc-vsx-fma-mutate"