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From: "sebastian-gcc at sipsolutions dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/105480] New: Vectorized `isnan` appears to trigger FPE
 on ppc64le
Date: Wed, 04 May 2022 13:15:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105480

            Bug ID: 105480
           Summary: Vectorized `isnan` appears to trigger FPE on ppc64le
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sebastian-gcc at sipsolutions dot net
  Target Milestone: ---

Compiling for ppc64le with `-O3` seems to use the `xvcmpgedp` instruction w=
hich
ends up setting the FPE flags.  I have created an example in godbolt:

https://godbolt.org/z/n8PfPPP1d

Clang will produce similar code (using the same instruction), but when enab=
ling
`-ftrapping-math` (as they always want...) will switch to `vcmpgtud`.

I think the same issue happens with `=3D=3D` and `!=3D` which (IIRC) should=
 not trap.=