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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
158 lines
3.2 KiB
ArmAsm
158 lines
3.2 KiB
ArmAsm
/* strchr with SSE2 with bsf
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Copyright (C) 2011-2022 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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#if IS_IN (libc)
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# include <sysdep.h>
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# define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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# define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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# define PUSH(REG) pushl REG; CFI_PUSH (REG)
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# define POP(REG) popl REG; CFI_POP (REG)
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# define PARMS 8
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# define ENTRANCE PUSH(%edi)
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# define RETURN POP(%edi); ret; CFI_PUSH(%edi);
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# define STR1 PARMS
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# define STR2 STR1+4
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.text
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ENTRY (__strchr_sse2_bsf)
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ENTRANCE
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mov STR1(%esp), %ecx
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movd STR2(%esp), %xmm1
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pxor %xmm2, %xmm2
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mov %ecx, %edi
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punpcklbw %xmm1, %xmm1
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punpcklbw %xmm1, %xmm1
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/* ECX has OFFSET. */
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and $15, %ecx
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pshufd $0, %xmm1, %xmm1
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je L(loop)
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/* Handle unaligned string. */
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and $-16, %edi
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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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/* Find where NULL is. */
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pmovmskb %xmm2, %edx
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/* Check if there is a match. */
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pmovmskb %xmm0, %eax
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/* Remove the leading bytes. */
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sarl %cl, %edx
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sarl %cl, %eax
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test %eax, %eax
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je L(unaligned_no_match)
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/* Check which byte is a match. */
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bsf %eax, %eax
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/* Is there a NULL? */
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test %edx, %edx
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je L(unaligned_match)
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bsf %edx, %edx
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cmpl %edx, %eax
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/* Return NULL if NULL comes first. */
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ja L(return_null)
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L(unaligned_match):
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add %edi, %eax
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add %ecx, %eax
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RETURN
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.p2align 4
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L(unaligned_no_match):
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test %edx, %edx
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jne L(return_null)
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pxor %xmm2, %xmm2
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add $16, %edi
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.p2align 4
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/* Loop start on aligned string. */
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L(loop):
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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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jmp L(loop)
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L(matches):
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pmovmskb %xmm2, %edx
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test %eax, %eax
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jz L(return_null)
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bsf %eax, %eax
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/* There is a match. First find where NULL is. */
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test %edx, %edx
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je L(match)
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bsf %edx, %ecx
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/* Check if NULL comes first. */
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cmpl %ecx, %eax
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ja L(return_null)
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L(match):
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sub $16, %edi
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add %edi, %eax
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RETURN
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/* Return NULL. */
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.p2align 4
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L(return_null):
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xor %eax, %eax
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RETURN
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END (__strchr_sse2_bsf)
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#endif
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