[llvm] r188998 - MemoryBuffer.cpp: Consider if PageSize were not 4096 in shouldUseMmap(). Follow-up to r188903.

[NAKAMURA Takumi]

Author: chapuni
Date: Thu Aug 22 05:23:52 2013
New Revision: 188998

URL: http://llvm.org/viewvc/llvm-project?rev=188998&view=rev
Log:
MemoryBuffer.cpp: Consider if PageSize were not 4096 in shouldUseMmap(). Follow-up to r188903.

The AllocationGranularity can be 65536 on Win32, even on Cygwin.

Modified:
    llvm/trunk/lib/Support/MemoryBuffer.cpp

Modified: llvm/trunk/lib/Support/MemoryBuffer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/MemoryBuffer.cpp?rev=188998&r1=188997&r2=188998&view=diff
==============================================================================
--- llvm/trunk/lib/Support/MemoryBuffer.cpp (original)
+++ llvm/trunk/lib/Support/MemoryBuffer.cpp Thu Aug 22 05:23:52 2013
@@ -276,7 +276,7 @@ static bool shouldUseMmap(int FD,
                           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)