MemoryBuffer.cpp: Consider if PageSize were not 4096 in shouldUseMmap(). Follow-up to r188903.
The AllocationGranularity can be 65536 on Win32, even on Cygwin.
llvm-svn: 188998
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index cab45c7..1c45c69 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -276,7 +276,7 @@
int PageSize) {
// We don't use mmap for small files because this can severely fragment our
// address space.
- if (MapSize < 4096*4)
+ if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
return false;
if (!RequiresNullTerminator)