From ab1ade496cabd5972c5eb622e3dc7271d2654bc3 Mon Sep 17 00:00:00 2001
From: Zachary Turner <zturner@google.com>
Date: Thu, 16 Nov 2017 22:39:55 +0000
Subject: [PATCH] Fix some undefined beahvior in FileMapping.

This was broken when building a 32-bit native toolchain, as
shifting a size_t right by 32 is UB when sizeof(size_t) == 8.

llvm-svn: 318462
---
 llvm/lib/Support/Windows/Path.inc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index f65ed5c..dd42055 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -734,8 +734,8 @@ std::error_code mapped_file_region::init(int FD, uint64_t Offset,
 
   HANDLE FileMappingHandle =
       ::CreateFileMappingW(FileHandle, 0, flprotect,
-                           Size >> 32,
-                           Size & 0xffffffff,
+                           Hi_32(Size),
+                           Lo_32(Size),
                            0);
   if (FileMappingHandle == NULL) {
     std::error_code ec = mapWindowsError(GetLastError());
-- 
2.7.4