Fix code to match comment. Fixes PR11340, a regression from r143209.

llvm-svn: 144121

2 files changed, 11 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index c1416328b74..2f41f729568 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -1612,7 +1612,7 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
       Lower = (-Upper) + 1;
     } else if (match(LHS, m_UDiv(m_ConstantInt(CI2), m_Value()))) {
       // 'udiv CI2, x' produces [0, CI2].
-      Upper = CI2->getValue();
+      Upper = CI2->getValue() + 1;
     } else if (match(LHS, m_UDiv(m_Value(), m_ConstantInt(CI2)))) {
       // 'udiv x, CI2' produces [0, UINT_MAX / CI2].
       APInt NegOne = APInt::getAllOnesValue(Width);
diff --git a/llvm/test/Transforms/InstSimplify/compare.ll b/llvm/test/Transforms/InstSimplify/compare.ll
index db5e72f9db4..9f3dffe603f 100644
--- a/llvm/test/Transforms/InstSimplify/compare.ll
+++ b/llvm/test/Transforms/InstSimplify/compare.ll
@@ -342,6 +342,16 @@ define i1 @udiv5(i32 %X) {
 ; CHECK: ret i1 false
 }
 
+; PR11340
+define i1 @udiv6(i32 %X) nounwind {
+; CHECK: @udiv6
+  %A = udiv i32 1, %X
+  %C = icmp eq i32 %A, 0
+  ret i1 %C
+; CHECK: ret i1 %C
+}
+
+
 define i1 @sdiv1(i32 %X) {
 ; CHECK: @sdiv1
   %A = sdiv i32 %X, 1000000