[llvm-bugs] [Bug 28000] New: ASan tries to use 32-bit shift operations to create 64-bit results

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28000

            Bug ID: 28000
           Summary: ASan tries to use 32-bit shift operations to create
                    64-bit results
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: HBBroeker at T-Online.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

There are dozens of rather worrying warnings from VisualStudio 2015 when
compiling ASan for 64-bit WIndows, concerning constructs of the type

   uptr t = (1UL << n);

where n is 32 or larger.  This code will fail if type uptr is a 64-bit integer,
while unsigned long, and thus "1UL", is 32-bit.  That appears to be the case on
Windows x86_64 builds.  I think all such cases have to be changed to an
equivalent of either

   uptr t = (1ULL << n);

or

   uptr t = ((uptr)1 << n);

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