On Fri, Apr 13, 2018 at 12:10:33PM +0000, Wilco Dijkstra wrote:
> > Anyway, here is what I think Richard was asking for, that I'm currently
> > bootstrapping/regtesting.  It can be easily combined with Martin's target
> > hook if needed, or do it only for
> > endp == 1 && target != const0_rtx && CALL_EXPR_TAILCALL (exp)
> This patch causes regressions on AArch64 since it now always calls mempcpy
> again, so yes either it would need to be done only for tailcalls (which fixes 
> the

No, it only uses mempcpy if we'd otherwise call memcpy library function and user
wrote mempcpy.  AFAIK 7.x and earlier behaved that way too, so it isn't a
regression, regression is only from released GCC versions.  And, a fix is
easy, just implement fast mempcpy on aarch64 ;)


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