From 8b9081081b4a7aef0e80b51c59707fcb5f751b53 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 4 Mar 2005 23:21:33 +0000
Subject: [PATCH] Do not compute 1ULL << 64, which is undefined.  This fixes
 Ptrdist/ks on the sparc, and testcase
 Regression/Transforms/InstCombine/2005-03-04-ShiftOverflow.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20445 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index a90dde6c8aa..e944672d262 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -2563,7 +2563,8 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
               Constant *Mask;
               if (CI->getType()->isUnsigned()) {
                 unsigned TypeBits = CI->getType()->getPrimitiveSize()*8;
-                Val &= (1ULL << TypeBits)-1;
+                if (TypeBits != 64)
+                  Val &= (1ULL << TypeBits)-1;
                 Mask = ConstantUInt::get(CI->getType(), Val);
               } else {
                 Mask = ConstantSInt::get(CI->getType(), Val);