On December 30, 2016 4:48:22 PM GMT+01:00, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>and got no warnings and the attached output. I'm not very good at
>reading
>PPC assembler, but I think what is happening in the "char" case is that
>gcc is trying to emulate a byte-wide operation using a word-wide one,
>ie an lwarx/stwcx. loop.
Hm. This seems to suggest a straight out code generation bug in that compiler, not a failure in intrinsic detection.
I'll note that there's certainly ppc64 machine with that intrinsic working (tested that on the community hydra during
atomicsdevelopment). So either it's a bug specific to some compiler version, or 32bit ppc.
I assume there's no trivial way to get a newer compiler on that machine?
Andres
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