1 files changed, 13 insertions, 2 deletions
diff --git a/lib/CodeGen/TargetLoweringBase.cpp b/lib/CodeGen/TargetLoweringBase.cpp
index 1bc89aa..78492a6 100644
--- a/lib/CodeGen/TargetLoweringBase.cpp
+++ b/lib/CodeGen/TargetLoweringBase.cpp
@@ -38,6 +38,11 @@
 #include <cctype>
 using namespace llvm;
 
+static cl::opt<bool> JumpIsExpensiveOverride(
+    "jump-is-expensive", cl::init(false),
+    cl::desc("Do not create extra branches to split comparison logic."),
+    cl::Hidden);
+
 /// InitLibcallNames - Set default libcall names.
 ///
 static void InitLibcallNames(const char **Names, const Triple &TT) {
@@ -757,7 +762,7 @@ TargetLoweringBase::TargetLoweringBase(const TargetMachine &tm) : TM(tm) {
   IntDivIsCheap = false;
   FsqrtIsCheap = false;
   Pow2SDivIsCheap = false;
-  JumpIsExpensive = false;
+  JumpIsExpensive = JumpIsExpensiveOverride;
   PredictableSelectIsExpensive = false;
   MaskAndBranchFoldingIsLegal = false;
   EnableExtLdPromotion = false;
@@ -778,7 +783,7 @@ TargetLoweringBase::TargetLoweringBase(const TargetMachine &tm) : TM(tm) {
   InsertFencesForAtomic = false;
   MinimumJumpTableEntries = 4;
 
-  InitLibcallNames(LibcallRoutineNames, Triple(TM.getTargetTriple()));
+  InitLibcallNames(LibcallRoutineNames, TM.getTargetTriple());
   InitCmpLibcallCCs(CmpLibcallCCs);
   InitLibcallCallingConvs(LibcallCallingConvs);
 }
@@ -915,6 +920,12 @@ bool TargetLoweringBase::canOpTrap(unsigned Op, EVT VT) const {
   }
 }
 
+void TargetLoweringBase::setJumpIsExpensive(bool isExpensive) {
+  // If the command-line option was specified, ignore this request.
+  if (!JumpIsExpensiveOverride.getNumOccurrences())
+    JumpIsExpensive = isExpensive;
+}
+
 TargetLoweringBase::LegalizeKind
 TargetLoweringBase::getTypeConversion(LLVMContext &Context, EVT VT) const {
   // If this is a simple type, use the ComputeRegisterProp mechanism.