> On 7 Nov 2019, at 15:24, Hans Wennborg <h...@chromium.org> wrote:
>
> Looking at LLVM's -print-after-all shows a diff after GVN which seems
> to come from this if-statement in tests/mpn/t-sqrlo.c:
>
> if (pp[-1] != p_before || pp[n] != p_after
> || scratch[-1] != s_before || scratch[itch] != s_after
> || mpn_cmp (refp, pp, n) != 0)
> {
>
> It looks like the "scratch[-1] != s_before" expression was previously
> folded to false, but now it's folded to undef (and the branch ends up
> going the other way). That matches the commit message from the
> bisection.
GMP bugs may be reported to their bug list, and the UBSan might be strengthened
to capture this.
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