For PR1202:
Make sure we found an existing Alignment before overwriting it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34308 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index ed9d846..41bc78a 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -245,7 +245,8 @@
std::pair<align_iterator, align_iterator> ins_result =
std::equal_range(Alignments.begin(), Alignments.end(), elt);
align_iterator I = ins_result.first;
- if (I->AlignType == align_type && I->TypeBitWidth == bit_width) {
+ if (I != Alignments.end() && I->AlignType == align_type &&
+ I->TypeBitWidth == bit_width) {
// Update the abi, preferred alignments.
I->ABIAlign = abi_align;
I->PrefAlign = pref_align;