[SimplifyCFG] propagate branch metadata when creating select (PR26636)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264527 91177308-0d34-0410-b5e6-96231b3b80d8
tahirramzan · Mar 26, 2016 · cdc2723 · cdc2723
1 parent 992a592
commit cdc2723
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Showing 2 changed files with 7 additions and 4 deletions.
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1642,8 +1642,8 @@ static bool SpeculativelyExecuteBB(BranchInst *BI, BasicBlock *ThenBB,
     Value *FalseV = SpeculatedStoreValue;
     if (Invert)
       std::swap(TrueV, FalseV);
-    Value *S = Builder.CreateSelect(BrCond, TrueV, FalseV, TrueV->getName() +
-                                    "." + FalseV->getName());
+    Value *S = Builder.CreateSelect(
+        BrCond, TrueV, FalseV, TrueV->getName() + "." + FalseV->getName(), BI);
     SpeculatedStore->setOperand(0, S);
   }
 

diff --git a/test/Transforms/SimplifyCFG/speculate-store.ll b/test/Transforms/SimplifyCFG/speculate-store.ll
@@ -4,15 +4,15 @@ define void @ifconvertstore(i32* %A, i32 %B, i32 %C, i32 %D) {
 ; CHECK-LABEL: @ifconvertstore(
 ; CHECK:         store i32 %B, i32* %A
 ; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 %D, 42
-; CHECK-NEXT:    [[C_B:%.*]] = select i1 [[CMP]], i32 %C, i32 %B
+; CHECK-NEXT:    [[C_B:%.*]] = select i1 [[CMP]], i32 %C, i32 %B, !prof !0
 ; CHECK-NEXT:    store i32 [[C_B]], i32* %A
 ; CHECK-NEXT:    ret void
 ;
 entry:
 ; First store to the location.
   store i32 %B, i32* %A
   %cmp = icmp sgt i32 %D, 42
-  br i1 %cmp, label %if.then, label %ret.end
+  br i1 %cmp, label %if.then, label %ret.end, !prof !0
 
 ; Make sure we speculate stores like the following one. It is cheap compared to
 ; a mispredicated branch.
@@ -85,3 +85,6 @@ ret.end:
   ret void
 }
 
+; CHECK: !0 = !{!"branch_weights", i32 3, i32 5}
+!0 = !{!"branch_weights", i32 3, i32 5}
+