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193 lines
3.1 KiB
ArmAsm
193 lines
3.1 KiB
ArmAsm
/* wcslen with SSE2
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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 STR 4
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.text
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ENTRY (__wcslen_sse2)
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mov STR(%esp), %edx
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cmpl $0, (%edx)
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jz L(exit_tail0)
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cmpl $0, 4(%edx)
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jz L(exit_tail1)
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cmpl $0, 8(%edx)
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jz L(exit_tail2)
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cmpl $0, 12(%edx)
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jz L(exit_tail3)
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cmpl $0, 16(%edx)
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jz L(exit_tail4)
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cmpl $0, 20(%edx)
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jz L(exit_tail5)
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cmpl $0, 24(%edx)
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jz L(exit_tail6)
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cmpl $0, 28(%edx)
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jz L(exit_tail7)
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pxor %xmm0, %xmm0
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lea 32(%edx), %eax
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lea 16(%edx), %ecx
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and $-16, %eax
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pcmpeqd (%eax), %xmm0
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pmovmskb %xmm0, %edx
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pxor %xmm1, %xmm1
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test %edx, %edx
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lea 16(%eax), %eax
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jnz L(exit)
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pcmpeqd (%eax), %xmm1
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pmovmskb %xmm1, %edx
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pxor %xmm2, %xmm2
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test %edx, %edx
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lea 16(%eax), %eax
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jnz L(exit)
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pcmpeqd (%eax), %xmm2
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pmovmskb %xmm2, %edx
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pxor %xmm3, %xmm3
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test %edx, %edx
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lea 16(%eax), %eax
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jnz L(exit)
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pcmpeqd (%eax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 16(%eax), %eax
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jnz L(exit)
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and $-0x40, %eax
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.p2align 4
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L(aligned_64_loop):
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movaps (%eax), %xmm0
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movaps 16(%eax), %xmm1
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movaps 32(%eax), %xmm2
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movaps 48(%eax), %xmm6
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pminub %xmm1, %xmm0
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pminub %xmm6, %xmm2
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pminub %xmm0, %xmm2
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pcmpeqd %xmm3, %xmm2
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pmovmskb %xmm2, %edx
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test %edx, %edx
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lea 64(%eax), %eax
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jz L(aligned_64_loop)
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pcmpeqd -64(%eax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 48(%ecx), %ecx
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jnz L(exit)
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pcmpeqd %xmm1, %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea -16(%ecx), %ecx
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jnz L(exit)
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pcmpeqd -32(%eax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea -16(%ecx), %ecx
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jnz L(exit)
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pcmpeqd %xmm6, %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea -16(%ecx), %ecx
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jnz L(exit)
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jmp L(aligned_64_loop)
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.p2align 4
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L(exit):
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sub %ecx, %eax
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shr $2, %eax
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test %dl, %dl
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jz L(exit_high)
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mov %dl, %cl
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and $15, %cl
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jz L(exit_1)
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ret
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.p2align 4
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L(exit_high):
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mov %dh, %ch
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and $15, %ch
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jz L(exit_3)
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add $2, %eax
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ret
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.p2align 4
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L(exit_1):
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add $1, %eax
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ret
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.p2align 4
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L(exit_3):
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add $3, %eax
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ret
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.p2align 4
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L(exit_tail0):
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xor %eax, %eax
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ret
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.p2align 4
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L(exit_tail1):
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mov $1, %eax
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ret
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.p2align 4
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L(exit_tail2):
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mov $2, %eax
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ret
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.p2align 4
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L(exit_tail3):
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mov $3, %eax
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ret
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.p2align 4
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L(exit_tail4):
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mov $4, %eax
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ret
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.p2align 4
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L(exit_tail5):
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mov $5, %eax
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ret
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.p2align 4
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L(exit_tail6):
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mov $6, %eax
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ret
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.p2align 4
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L(exit_tail7):
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mov $7, %eax
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ret
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END (__wcslen_sse2)
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#endif
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