commit 1abe64663e0865cf9bdc23de734df49acea2b0d4
author Evan Cheng <evan.cheng@apple.com> Wed Apr 22 22:45:37 2009 +0000
committer Evan Cheng <evan.cheng@apple.com> Wed Apr 22 22:45:37 2009 +0000
tree 8cf2fb3ad9733301ea675367b367846a4f83d4ba
parent 5654613a013b94a92f9ed65e1a2f34e0a8d9cfdf

Avoid deferencing use_begin() if value does not have a use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69836 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/IndVarSimplify.cpp

diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index 3e944d3..b1cde41 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -806,6 +806,7 @@
         // (RHS doesn't have to be constant.  There should be a better approach
         // than bottom-up pattern matching for this...)
         if (UInst && UInst->getOpcode()==Instruction::And &&
+            !UInst->use_empty() &&
             allUsesAreSameTyped(Instruction::ZExt, UInst) &&
             isa<ConstantInt>(UInst->getOperand(1))) {
           uint64_t newBitSize = LargestType->getPrimitiveSizeInBits();