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Date: Sat, 10 Jun 2017 13:25:00 -0400
From: David Edelsohn <>
Subject: Re: [PATCH] s390x: Add single instruction math functions

On Sat, Jun 10, 2017 at 11:36 AM, Szabolcs Nagy <> wrote:
> * David Edelsohn <> [2017-06-09 10:51:25 -0400]:
>> The following patch is a start at single instruction math functions
>> for s390x architecture to increase performance.
> looks good, i wonder why gcc does not have builtins support for
> ceil, floor, nearbyint, round and trunc
> (on aarch64 the builtins expand to single instruction with
> -fno-math-errno, but on s390x they remain libc calls

Both the functions and builtins are converted to single instructions
for me.  What architecture level is your GCC assuming?

> at some point we plan to have some internal header to turn
> math/string calls into builtins when compiling musl with gcc)

I have a patch set ready for powerpc64 teed up after this patch.

Thanks, David

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