From d71315f2ae8a14ca4b55f316ab00faf56c4f6208 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 1 Oct 2019 10:22:01 +0000
Subject: [PATCH] ConstantFold - ConstantFoldSelectInstruction - assume
 constant vector elements are constant. NFCI.

Goes a bit further than rL372743 which added the early out - elements should be Constant so use cast<Constant> instead (and rely on the assert if anything fails).

llvm-svn: 373321
---
 llvm/lib/IR/ConstantFold.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/lib/IR/ConstantFold.cpp b/llvm/lib/IR/ConstantFold.cpp
index ee0ad32..54814bb 100644
--- a/llvm/lib/IR/ConstantFold.cpp
+++ b/llvm/lib/IR/ConstantFold.cpp
@@ -746,8 +746,7 @@ Constant *llvm::ConstantFoldSelectInstruction(Constant *Cond,
                                                     ConstantInt::get(Ty, i));
       Constant *V2Element = ConstantExpr::getExtractElement(V2,
                                                     ConstantInt::get(Ty, i));
-      Constant *Cond = dyn_cast<Constant>(CondV->getOperand(i));
-      if (!Cond) break;
+      auto *Cond = cast<Constant>(CondV->getOperand(i));
       if (V1Element == V2Element) {
         V = V1Element;
       } else if (isa<UndefValue>(Cond)) {
-- 
2.7.4