https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100929
--- Comment #3 from Denis Yaroshevskiy <denis.yaroshevskij at gmail dot com> ---
> Please attach your testcases to the bug report.
Is what @Andrew Pinski copied enough? I can attach the same code as file.
> I don't know if there would be issues for comparisons (with -ftrapping-math
> for instance?).
-ftrapping-math causes clang to stop doing this optimisation.
I can see that clang does it, so I assume `nans` are OK without this flag. For
ints this is for sure OK.
> Note the other testcase is using eve which I have no idea what it is coming
> from.
Using eve just was much easier then writing this with intrinsics:
The point was:
vpcmpgtd ymm2, ymm0, ymm1
vpblendvb ymm0, ymm0, ymm1, ymm2
should become
vpminsd ymm0, ymm1, ymm0
And on arm:
cmgt v2.4s, v0.4s, v1.4s
bit v0.16b, v1.16b, v2.16b
should become
smin v0.4s, v1.4s, v0.4s
And
fcmgt v2.4s, v0.4s, v1.4s
bit v0.16b, v1.16b, v2.16b
should become
fmin v0.4s, v1.4s, v0.4s
I don't really know how it is done in `gcc` - but all these examples look like
the same issue. If it is very helpful to write all of them as intrinsics, I
can.
