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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
115 lines
3.5 KiB
ArmAsm
115 lines
3.5 KiB
ArmAsm
/* Optimized rawmemchr implementation for PowerPC64/POWER7 using cmpb insn.
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Copyright (C) 2010-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* int [r3] rawmemchr (void *s [r3], int c [r4]) */
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#ifndef RAWMEMCHR
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# define RAWMEMCHR __rawmemchr
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#endif
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.machine power7
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ENTRY_TOCLESS (RAWMEMCHR)
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CALL_MCOUNT 2
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dcbt 0,r3
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clrrdi r8,r3,3 /* Align the address to doubleword boundary. */
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/* Replicate byte to doubleword. */
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insrdi r4,r4,8,48
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insrdi r4,r4,16,32
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insrdi r4,r4,32,0
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/* Now r4 has a doubleword of c bytes. */
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rlwinm r6,r3,3,26,28 /* Calculate padding. */
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ld r12,0(r8) /* Load doubleword from memory. */
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cmpb r5,r12,r4 /* Compare each byte against c byte. */
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#ifdef __LITTLE_ENDIAN__
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srd r5,r5,r6
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sld r5,r5,r6
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#else
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sld r5,r5,r6 /* Move left to discard ignored bits. */
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srd r5,r5,r6 /* Bring the bits back as zeros. */
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#endif
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cmpdi cr7,r5,0 /* If r5 == 0, no c bytes have been found. */
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bne cr7,L(done)
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mtcrf 0x01,r8
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/* Are we now aligned to a quadword boundary? If so, skip to
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the main loop. Otherwise, go through the alignment code. */
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bt 28,L(loop)
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/* Handle DWORD2 of pair. */
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ldu r12,8(r8)
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cmpb r5,r12,r4
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cmpdi cr7,r5,0
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bne cr7,L(done)
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b L(loop) /* We branch here (rather than falling through)
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to skip the nops due to heavy alignment
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of the loop below. */
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/* Main loop to look for the end of the string. Since it's a
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small loop (< 8 instructions), align it to 32-bytes. */
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.p2align 5
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L(loop):
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/* Load two doublewords, compare and merge in a
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single register for speed. This is an attempt
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to speed up the byte-checking process for bigger strings. */
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ld r12,8(r8)
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ldu r11,16(r8)
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cmpb r5,r12,r4
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cmpb r6,r11,r4
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or r7,r5,r6
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cmpdi cr7,r7,0
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beq cr7,L(loop)
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/* OK, one (or both) of the doublewords contains a 'c' byte. Check
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the first doubleword and decrement the address in case the first
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doubleword really contains a c byte. */
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cmpdi cr6,r5,0
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addi r8,r8,-8
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bne cr6,L(done)
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/* The 'c' byte must be in the second doubleword. Adjust the address
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again and move the result of cmpb to r10 so we can calculate the
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pointer. */
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mr r5,r6
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addi r8,r8,8
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/* r5 has the output of the cmpb instruction, that is, it contains
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0xff in the same position as the 'c' byte in the original
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doubleword from the string. Use that fact to find out what is
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the position of the byte inside the string. */
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L(done):
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#ifdef __LITTLE_ENDIAN__
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addi r0,r5,-1
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andc r0,r0,r5
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popcntd r0,r0 /* Count trailing zeros. */
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#else
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cntlzd r0,r5 /* Count leading zeros before the match. */
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#endif
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srdi r0,r0,3 /* Convert leading zeros to bytes. */
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add r3,r8,r0 /* Return address of the matching char. */
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blr
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END (RAWMEMCHR)
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weak_alias (__rawmemchr,rawmemchr)
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libc_hidden_builtin_def (__rawmemchr)
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