[llvm-bugs] [Bug 47249] New: Some builtin intrinsics that are not constexpr but could be

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47249

            Bug ID: 47249
           Summary: Some builtin intrinsics that are not constexpr but
                    could be
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: erich.keane at intel.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

This isn't exhaustive, but all are low hanging fruit:

bit twiddling:

__builtin_bitreverse8
__builtin_bitreverse16
__builtin_bitreverse32
__builtin_bitreverse64

__builtin_rotateleft8
__builtin_rotateleft16
__builtin_rotateleft32
__builtin_rotateleft64

__builtin_rotateright8
__builtin_rotateright16
__builtin_rotateright32
__builtin_rotateright64

vectors:

__builtin_convertvector
__builtin_shufflevector

-fms-extensions variants:

__lzcnt16
__lzcnt
__lzcnt64

__popcnt16
__popcnt
__popcnt64

_rotl8
_rotl16
_rotl
_rotl64
_lrotl

_rotr8
_rotr16
_rotr
_rotr64
_lrotr

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