https://llvm.org/bugs/show_bug.cgi?id=26557
Bug ID: 26557
Summary: When casting an unsigned result of ~ operator to a
larger integer type, MSVC warns on that
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
We found that when we build LLVM/Clang on a 64-bit Windows, the MSVC compiler
prints out a few warnings about possible misuses of ~ operator.
http://lab.llvm.org:8011/builders/lld-x86_64-win7/builds/29601/steps/build%20lld/logs/warnings%20%2811%29
It warns if an unsigned result of ~ is extended to a larger integer type. For
example, if you have a function f(uint64_t) and a varaible x of type uint32_t,
it warns on f(~x).
This may be useful because for example the above case is not very obvious.
Should we warn on the same thing?
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