[llvm-bugs] [Bug 47560] New: __builtin_round not constexpr

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47560

            Bug ID: 47560
           Summary: __builtin_round not constexpr
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: linux at carewolf.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The builtin __builtin_constexpr is not constexpr, which is unfortunate as it is
nicely replaces with a single fcvtas instruction on arm64 architectures.

The same builtin on GCC is constexpr (though I don't think the C wrapped round
functions in cmath is).

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