[PATCH] tilegx: work around vector insn bug in gcc

[Adhemerval Zanella]

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.)?