Respect LibraryInfo in populateLTOPassManager and use it. NFC.

[oota-llvm.git] / lib / Transforms / Utils / LowerExpectIntrinsic.cpp

diff --git a/lib/Transforms/Utils/LowerExpectIntrinsic.cpp b/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
index 4aee8ff51a4e0ec36c027f19f89b060c012de7d9..ff89e7474402556f419c62dd534d4b320eae9303 100644 (file)
--- a/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
+++ b/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
@@ -11,7 +11,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "lower-expect-intrinsic"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/IR/BasicBlock.h"
@@ -29,7 +28,9 @@
 
 using namespace llvm;
 
-STATISTIC(IfHandled, "Number of 'expect' intrinsic intructions handled");
+#define DEBUG_TYPE "lower-expect-intrinsic"
+
+STATISTIC(IfHandled, "Number of 'expect' intrinsic instructions handled");
 
 static cl::opt<uint32_t>
 LikelyBranchWeight("likely-branch-weight", cl::Hidden, cl::init(64),
@@ -52,7 +53,7 @@ namespace {
       initializeLowerExpectIntrinsicPass(*PassRegistry::getPassRegistry());
     }
 
-    bool runOnFunction(Function &F);
+    bool runOnFunction(Function &F) override;
   };
 }
 
@@ -94,15 +95,25 @@ bool LowerExpectIntrinsic::HandleIfExpect(BranchInst *BI) {
     return false;
 
   // Handle non-optimized IR code like:
-  //   %expval = call i64 @llvm.expect.i64.i64(i64 %conv1, i64 1)
+  //   %expval = call i64 @llvm.expect.i64(i64 %conv1, i64 1)
   //   %tobool = icmp ne i64 %expval, 0
   //   br i1 %tobool, label %if.then, label %if.end
+  //
+  // Or the following simpler case:
+  //   %expval = call i1 @llvm.expect.i1(i1 %cmp, i1 1)
+  //   br i1 %expval, label %if.then, label %if.end
+
+  CallInst *CI;
 
   ICmpInst *CmpI = dyn_cast<ICmpInst>(BI->getCondition());
-  if (!CmpI || CmpI->getPredicate() != CmpInst::ICMP_NE)
-    return false;
+  if (!CmpI) {
+    CI = dyn_cast<CallInst>(BI->getCondition());
+  } else {
+    if (CmpI->getPredicate() != CmpInst::ICMP_NE)
+      return false;
+    CI = dyn_cast<CallInst>(CmpI->getOperand(0));
+  }
 
-  CallInst *CI = dyn_cast<CallInst>(CmpI->getOperand(0));
   if (!CI)
     return false;
 
@@ -127,7 +138,10 @@ bool LowerExpectIntrinsic::HandleIfExpect(BranchInst *BI) {
 
   BI->setMetadata(LLVMContext::MD_prof, Node);
 
-  CmpI->setOperand(0, ArgValue);
+  if (CmpI)
+    CmpI->setOperand(0, ArgValue);
+  else
+    BI->setCondition(ArgValue);
   return true;
 }