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[50.194.63.110]) by mx.google.com with ESMTPS id wm3sm33323746pbc.4.2013.03.06.15.54.05 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Wed, 06 Mar 2013 15:54:06 -0800 (PST) From: Richard Henderson To: libc-ports@sourceware.org Cc: joseph@codesourcery.com Subject: [PATCH 5/5] arm: Implement armv6 optimized rawmemchr Date: Wed, 06 Mar 2013 23:54:00 -0000 Message-Id: <1362614027-25800-6-git-send-email-rth@twiddle.net> In-Reply-To: <1362614027-25800-1-git-send-email-rth@twiddle.net> References: <1362614027-25800-1-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: 2013-03/txt/msg00063.txt.bz2 --- ports/sysdeps/arm/armv6/rawmemchr.S | 105 ++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 ports/sysdeps/arm/armv6/rawmemchr.S diff --git a/ports/sysdeps/arm/armv6/rawmemchr.S b/ports/sysdeps/arm/armv6/rawmemchr.S new file mode 100644 index 0000000..7877bcf --- /dev/null +++ b/ports/sysdeps/arm/armv6/rawmemchr.S @@ -0,0 +1,105 @@ +/* rawmemchr -- find a byte within an unsized memory block. + 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 (__rawmemchr) + @ r0 = start of string + @ r1 = character to match + @ returns a pointer to the match, which must be present. + ldrb r2, [r0] @ load first byte asap + + @ To cater to long strings, we want to search through a few + @ characters until we reach an aligned pointer. To cater to + @ small strings, we don't want to start doing word operations + @ immediately. The compromise is a maximum of 16 bytes less + @ whatever is required to end with an aligned pointer. + @ r3 = number of characters to search in alignment loop + and r3, r0, #7 + uxtb r1, r1 + rsb r3, r3, #15 @ 16 - 1 peeled loop iteration + cmp r2, r1 + it eq + bxeq lr + + @ Loop until we find ... +1: ldrb r2, [r0, #1]! + subs r3, r3, #1 @ ... the alignment point + it ne + cmpne r2, r1 @ ... or C + bne 1b + + @ Disambiguate the exit possibilites above + cmp r2, r1 @ Found C + it eq + bxeq lr + add r0, r0, #1 + + @ So now we're aligned. + ldrd r2, r3, [r0], #8 + orr r1, r1, r1, lsl #8 @ Replicate C to all bytes +#ifdef ARCH_HAS_T2 + movw ip, #0x0101 + pld [r0, #64] + movt ip, #0x0101 +#else + ldr ip, =0x01010101 + pld [r0, #64] +#endif + orr r1, r1, r1, lsl #16 + + @ Loop searching for C, 8 bytes at a time. + @ Subtracting (unsigned saturating) from 1 means result of 1 for + @ any byte that was originally zero and 0 otherwise. Therefore + @ we consider the lsb of each byte the "found" bit. +2: eor r2, r2, r1 @ Convert C bytes to 0 + eor r3, r3, r1 + uqsub8 r2, ip, r2 @ Find C + uqsub8 r3, ip, r3 + pld [r0, #128] + orrs r3, r3, r2 @ Test both words for found + it eq + ldrdeq r2, r3, [r0], #8 + beq 2b + + @ Found something. Disambiguate between first and second words. + @ Adjust r0 to point to the word containing the match. + @ Adjust r2 to the found bits for the word containing the match. + cmp r2, #0 + sub r0, r0, #4 + ite eq + moveq r2, r3 + subne r0, r0, #4 + + @ Find the bit-offset of the match within the word. Note that the + @ bit result from clz will be 7 higher than "true", but we'll + @ immediately discard those bits converting to a byte offset. +#ifdef __ARMEL__ + rev r2, r2 @ For LE, count from the little end +#endif + clz r2, r2 + add r0, r0, r2, lsr #3 @ Adjust the pointer to the found byte + bx lr + +END (__rawmemchr) + +weak_alias (__rawmemchr, rawmemchr) +libc_hidden_def (__rawmemchr) -- 1.8.1.2