[PATCH] [AArch64] Suppress unnecessary FPSR and FPCR writes

[Marcus Shawcroft]

On 24 April 2014 00:51, Ian Bolton <ian.bolton@arm.com> wrote:
> Writes to fpsr and fpcr are expensive.  This patch adds checks before each
> write to ensure we only write new values to them (as opposed to rewriting
> what's there).
>
> Tested with make check and make bench, with no regressions.
>
> OK for commit?
>
> Cheers,
> Ian
>
>
> 2014-04-24  Ian Bolton  <ian.bolton@arm.com>
>
>         * sysdeps/aarch64/fpu/fclrexcpt.c (feclearexcept): Don't write to
>         fpsr if value didn't change.
>         * sysdeps/aarch64/fpu/fedisblxcpt.c (fedisableexcept): Don't write
>         to fpcr if value didn't change.
>         * sysdeps/aarch64/fpu/feenablxcpt.c (feenableexcept): Likewise.
>         * sysdeps/aarch64/fpu/feholdexcpt.c (feholdexcept): Don't write to
>         fpsr or fpcr if value didn't change.
>         * sysdeps/aarch64/fpu/fesetenv.c (fesetenv): Likewise.
>         * sysdeps/aarch64/fpu/fesetround.c (fesetround): Don't write to
>         fpcr if value didn't change.
>         * sysdeps/aarch64/fpu/fsetexcptflg.c (fesetexceptflag): Don't write
>         to fpsr if value didn't change.

OK, and committed.
/Marcus