1 files changed, 21 insertions, 11 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 659b0c572fb..3adad3b3b9d 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -40,6 +40,7 @@
 #include "llvm/IR/ValueHandle.h"
 #include "llvm/IR/ValueMap.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -4538,11 +4539,25 @@ static bool sinkSelectOperand(const TargetTransformInfo *TTI, Value *V) {
 
 /// Returns true if a SelectInst should be turned into an explicit branch.
 static bool isFormingBranchFromSelectProfitable(const TargetTransformInfo *TTI,
+                                                const TargetLowering *TLI,
                                                 SelectInst *SI) {
+  // If even a predictable select is cheap, then a branch can't be cheaper.
+  if (!TLI->isPredictableSelectExpensive())
+    return false;
+
   // FIXME: This should use the same heuristics as IfConversion to determine
-  // whether a select is better represented as a branch.  This requires that
-  // branch probability metadata is preserved for the select, which is not the
-  // case currently.
+  // whether a select is better represented as a branch.
+
+  // If metadata tells us that the select condition is obviously predictable,
+  // then we want to replace the select with a branch.
+  uint64_t TrueWeight, FalseWeight;
+  if (SI->extractProfMetadata(TrueWeight, FalseWeight)) {
+    uint64_t Max = std::max(TrueWeight, FalseWeight);
+    uint64_t Sum = TrueWeight + FalseWeight;
+    auto Probability = BranchProbability::getBranchProbability(Max, Sum);
+    if (Probability > TLI->getPredictableBranchThreshold())
+      return true;
+  }
 
   CmpInst *Cmp = dyn_cast<CmpInst>(SI->getCondition());
 
@@ -4580,14 +4595,9 @@ bool CodeGenPrepare::optimizeSelectInst(SelectInst *SI) {
   else
     SelectKind = TargetLowering::ScalarValSelect;
 
-  // Do we have efficient codegen support for this kind of 'selects' ?
-  if (TLI->isSelectSupported(SelectKind)) {
-    // We have efficient codegen support for the select instruction.
-    // Check if it is profitable to keep this 'select'.
-    if (!TLI->isPredictableSelectExpensive() ||
-        !isFormingBranchFromSelectProfitable(TTI, SI))
-      return false;
-  }
+  if (TLI->isSelectSupported(SelectKind) &&
+      !isFormingBranchFromSelectProfitable(TTI, TLI, SI))
+    return false;
 
   ModifiedDT = true;