Bug#785475: arm64 shift+rotate optimization bug
On Sat, 16 May 2015 20:47:34 +0200 Magnus Holmgren <holmgren@debian.org> wrote:
> Package: gcc-4.9
> Version: 4.9.2-16
>
> I think I may have discovered an optimizer bug that results in incorrect code
> when building nettle. The Camellia cipher contains code similar to the
> following, which reproduces the bug:
<snip>
I don't have a Debian arm64 machine available, but I have been able to
reproduce the problem with the Linaro GCC 4.9 branch. The issue is
caused by a backport of r217118, and the patch for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63843 should fix it.
For reference, the Linaro bugzilla for this is at
https://bugs.linaro.org/show_bug.cgi?id=1599
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