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Re: [PATCH] tilegx: work around vector insn bug in gcc
On Tue, 5 Dec 2017, Adhemerval Zanella wrote:
> On 04/12/2017 13:56, Chris Metcalf wrote:
> > Avoid an issue in gcc where some of the vector (aka SIMD) ops will
> > sometimes end up getting wrongly optimized out. We use these
> > instructions in many of the string implementations. If/when we
> > have an upstreamed fix for this problem in gcc we can conditionalize
> > the use of the extended assembly workaround in glibc.
> Do you the conditions to trigger this issue (compiler option, gcc
> version, etc.)?
It would seem appropriate for the comment saying "buggy in current
compiler versions" to link to a corresponding bug report in GCC Bugzilla.
Joseph S. Myers