RKSimon updated this revision to Diff 32514.
RKSimon added a comment.
Added ia32 builtin undef intrinsics (I didn't bother with the mmx as I can't
find any evidence of an undefined intrinsic for it). Added the avx512
intrinsics referenced in the intel intrinsics guide.
Technically there's
...@gmail.com; Kuperstein, Michael M
Cc: david.majne...@gmail.com; Badouh, Asaf; cfe-commits@lists.llvm.org; Richard
Smith
Subject: Re: [PATCH] D12052: [X86][SSE] Add _mm_undefined_* intrinsics
On Sun, Aug 16, 2015 at 3:05 AM Simon Pilgrim
llvm-...@redking.me.ukmailto:llvm-...@redking.me.uk wrote:
RKSimon
On Sun, Aug 16, 2015 at 3:05 AM Simon Pilgrim llvm-...@redking.me.uk
wrote:
RKSimon added a comment.
Yes using that uninitialized value has worried me as well. I originally
set it to zero (and considered using __ LINE __ or __ COUNTER __) but both
introduce defined behaviour that I could see
mkuper added a comment.
Thanks, Simon!
I've wanted to add the _undefined intrinsics for a while now, but never got to
it.
Anyway, this sort of implementation somewhat worries me.
Yes, I know that the gcc intrinsics do something very similar.
And I also know that in practice we'll get an undef
RKSimon added a comment.
Yes using that uninitialized value has worried me as well. I originally set it
to zero (and considered using __ LINE __ or __ COUNTER __) but both introduce
defined behaviour that I could see causing all sorts of problems further down
the line in debug vs release
RKSimon created this revision.
RKSimon added reviewers: craig.topper, echristo, mkuper.
RKSimon added a subscriber: cfe-commits.
RKSimon set the repository for this revision to rL LLVM.
Adds missing SSE/AVX 'undefined' intrinsics (PR24040):
_mm_undefined_pd + _mm256_undefined_pd
_mm_undefined_ps
