https://llvm.org/bugs/show_bug.cgi?id=31803
Gonzalo BG <gonzalob...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Gonzalo BG <gonzalob...@gmail.com> ---
So i've failed to reproduce this with clang trunk on aarch64:
https://godbolt.org/g/DHS2xz
clang 4.0 lowers __builtin_bitreverse to rbit properly.
On x86 the 32 and 64 bit versions of bitreverse look very good, but the
generated code for the 8-bit version looks worse than the naive implementation:
https://godbolt.org/g/kAlOC7
I'm closing this and filling a new issue for the bitreverse.i8 instruction.
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