From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28041 invoked by alias); 27 Feb 2013 03:17:29 -0000 Received: (qmail 27862 invoked by uid 22791); 27 Feb 2013 03:17:21 -0000 X-SWARE-Spam-Status: No, hits=-5.2 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,KHOP_RCVD_TRUST,KHOP_SPAMHAUS_DROP,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,TW_CL X-Spam-Check-By: sourceware.org Received: from mail-pb0-f54.google.com (HELO mail-pb0-f54.google.com) (209.85.160.54) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 27 Feb 2013 03:17:05 +0000 Received: by mail-pb0-f54.google.com with SMTP id rr4so71656pbb.41 for ; Tue, 26 Feb 2013 19:17:05 -0800 (PST) X-Received: by 10.66.155.33 with SMTP id vt1mr5085509pab.103.1361935025346; Tue, 26 Feb 2013 19:17:05 -0800 (PST) Received: from pebble.twiddle.net (50-194-63-110-static.hfc.comcastbusiness.net. [50.194.63.110]) by mx.google.com with ESMTPS id pp1sm265271pac.7.2013.02.26.19.17.03 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 26 Feb 2013 19:17:04 -0800 (PST) From: Richard Henderson To: libc-ports@sourceware.org Cc: Joseph Myers Subject: [PATCH 19/26] arm: Add optimized ffs for armv6t2 Date: Wed, 27 Feb 2013 03:17:00 -0000 Message-Id: <1361934986-17018-20-git-send-email-rth@twiddle.net> In-Reply-To: <1361934986-17018-1-git-send-email-rth@twiddle.net> References: <1361934986-17018-1-git-send-email-rth@twiddle.net> X-IsSubscribed: yes Mailing-List: contact libc-ports-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: libc-ports-owner@sourceware.org X-SW-Source: 2013-02/txt/msg00078.txt.bz2 Half the size of gcc 4.8's output. --- * sysdeps/arm/armv6t2/ffs.S: New file. * sysdeps/arm/armv6t2/ffsll.S: New file. --- ports/sysdeps/arm/armv6t2/ffs.S | 34 +++++++++++++++++++++++++++ ports/sysdeps/arm/armv6t2/ffsll.S | 49 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 ports/sysdeps/arm/armv6t2/ffs.S create mode 100644 ports/sysdeps/arm/armv6t2/ffsll.S diff --git a/ports/sysdeps/arm/armv6t2/ffs.S b/ports/sysdeps/arm/armv6t2/ffs.S new file mode 100644 index 0000000..765fb5d --- /dev/null +++ b/ports/sysdeps/arm/armv6t2/ffs.S @@ -0,0 +1,34 @@ +/* Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include + + .syntax unified + .text + +ENTRY(__ffs) + cmp r0, #0 + ittt ne + rbitne r0, r0 + clzne r0, r0 + addne r0, r0, #1 + bx lr +END(__ffs) + +weak_alias (__ffs, ffs) +weak_alias (__ffs, ffsl) +libc_hidden_builtin_def (ffs) diff --git a/ports/sysdeps/arm/armv6t2/ffsll.S b/ports/sysdeps/arm/armv6t2/ffsll.S new file mode 100644 index 0000000..d428509 --- /dev/null +++ b/ports/sysdeps/arm/armv6t2/ffsll.S @@ -0,0 +1,49 @@ +/* Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include + + .syntax unified + .text + +ENTRY(ffsll) + @ If low part is 0, operate on the high part. Ensure that the + @ word on which we operate is in r0. Set r2 to the bit offset + @ of the word being considered. Set the flags for the word + @ being operated on. +#ifdef __ARMEL__ + cmp r0, #0 + itee ne + movne r2, #0 + moveq r2, #32 + movseq r0, r1 +#else + cmp r1, #0 + ittee ne + movne r2, #0 + movne r0, r1 + moveq r2, #32 + cmpeq r0, #0 +#endif + @ Perform the ffs on r0. + itttt ne + rbitne r0, r0 + clzne r0, r0 + addne r0, r0, #1 + addne r0, r0, r2 + bx lr +END(ffsll) -- 1.8.1.2