[llvm-bugs] [Bug 18888] Cannot select: intrinsic %llvm.x86.sse42.crc32.32.8

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Sep 15 13:42:15 PDT 2017


Craig Topper <craig.topper at gmail.com> changed:

           What    |Removed                     |Added
                 CC|                            |craig.topper at gmail.com
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #4 from Craig Topper <craig.topper at gmail.com> ---
Resolving as invalid. This looks to have been compiled without enabling support
CRC32 feature either through -march or -mcrc32. We generally tell people not
use the builtin directly and instead to use the intrinsic in x86intrin.h

At the time this was filed using the intrinsic should have given a compile
error that the intrinsic wouldn't be defined without enabling crc32. Current
version of clang should detect the missing feature support on the builtin even
without using the intrinsic.

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