[NewGVN] Add CL option to control the generation of phi-of-ops (disable by default).
Differential Revision: https://reviews.llvm.org/D36478539
llvm-svn: 310594
diff --git a/llvm/lib/Transforms/Scalar/NewGVN.cpp b/llvm/lib/Transforms/Scalar/NewGVN.cpp
index e620ae9..ceb5350 100644
--- a/llvm/lib/Transforms/Scalar/NewGVN.cpp
+++ b/llvm/lib/Transforms/Scalar/NewGVN.cpp
@@ -127,6 +127,10 @@
static cl::opt<bool> EnableStoreRefinement("enable-store-refinement",
cl::init(false), cl::Hidden);
+/// Currently, the generation "phi of ops" can result in correctness issues.
+static cl::opt<bool> EnablePhiOfOps("enable-phi-of-ops", cl::init(false),
+ cl::Hidden);
+
//===----------------------------------------------------------------------===//
// GVN Pass
//===----------------------------------------------------------------------===//
@@ -2442,6 +2446,8 @@
}
static bool okayForPHIOfOps(const Instruction *I) {
+ if (!EnablePhiOfOps)
+ return false;
return isa<BinaryOperator>(I) || isa<SelectInst>(I) || isa<CmpInst>(I) ||
isa<LoadInst>(I);
}