[InstSimplify] teach SimplifySelectInst() to fold more vector selects

[android-x86/external-llvm.git] / lib / Analysis / InstructionSimplify.cpp

diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
index 05afc4f..6eac4b3 100644 (file)
--- a/lib/Analysis/InstructionSimplify.cpp
+++ b/lib/Analysis/InstructionSimplify.cpp
@@ -3580,6 +3580,9 @@ static Value *SimplifySelectInst(Value *CondVal, Value *TrueVal,
   // select true, X, Y  -> X
   // select false, X, Y -> Y
   if (Constant *CB = dyn_cast<Constant>(CondVal)) {
+    if (Constant *CT = dyn_cast<Constant>(TrueVal))
+      if (Constant *CF = dyn_cast<Constant>(FalseVal))
+        return ConstantFoldSelectInstruction(CB, CT, CF);
     if (CB->isAllOnesValue())
       return TrueVal;
     if (CB->isNullValue())