MemoryBuffer: Don't use mmap when FileSize is multiple of 4k on Cygwin.
On Cygwin, getpagesize() returns 64k(AllocationGranularity). In r214580, the size of X86GenInstrInfo.inc became 1499136. FIXME: We should reorganize again getPageSize() on Win32. MapFile allocates address along AllocationGranularity but view is mapped by physical page. llvm-svn: 214681
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@ -305,6 +305,14 @@ static bool shouldUseMmap(int FD,
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if ((FileSize & (PageSize -1)) == 0)
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return false;
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#if defined(__CYGWIN__)
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// Don't try to map files that are exactly a multiple of the physical page size
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// if we need a null terminator.
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// FIXME: We should reorganize again getPageSize() on Win32.
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if ((FileSize & (4096 - 1)) == 0)
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return false;
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#endif
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return true;
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}
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