Added a test and fixed a bug in BumpPtrAllocator relating to large alignment

values.  Hopefully this fixes PR4622.

llvm-svn: 77088

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Support/Allocator.cpp b/llvm/lib/Support/Allocator.cpp
index 230c421f1fe..36da4432073 100644
--- a/llvm/lib/Support/Allocator.cpp
+++ b/llvm/lib/Support/Allocator.cpp
@@ -95,8 +95,8 @@ void *BumpPtrAllocator::Allocate(size_t Size, size_t Alignment) {
   }
 
   // If Size is really big, allocate a separate slab for it.
-  if (Size > SizeThreshold) {
-    size_t PaddedSize = Size + sizeof(MemSlab) + Alignment - 1;
+  size_t PaddedSize = Size + sizeof(MemSlab) + Alignment - 1;
+  if (PaddedSize > SizeThreshold) {
     MemSlab *NewSlab = Allocator.Allocate(PaddedSize);
 
     // Put the new slab after the current slab, since we are not allocating