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102 lines
2.7 KiB
ArmAsm
102 lines
2.7 KiB
ArmAsm
/* strlen used for beginning of str{n}cat using AVX2.
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Copyright (C) 2011-2024 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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/* NOTE: This file is meant to be included by strcat-avx2 or
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strncat-avx2 and does not standalone. Before including %rdi
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must be saved in %rax. */
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/* Simple strlen implementation that ends at
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L(strcat_strlen_done). */
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movq %rdi, %r8
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andq $(VEC_SIZE * -1), %r8
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VPCMPEQ (%r8), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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shrxl %edi, %ecx, %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v0)
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VPCMPEQ VEC_SIZE(%r8), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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leaq (VEC_SIZE)(%r8), %rdi
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testl %ecx, %ecx
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jnz L(bsf_and_done_v0)
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VPCMPEQ (VEC_SIZE * 1)(%rdi), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v1)
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v2)
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v3)
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orq $(VEC_SIZE * 4 - 1), %rdi
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.p2align 4,, 8
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L(loop_2x_vec):
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VMOVA (VEC_SIZE * 0 + 1)(%rdi), %VMM(0)
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VPMIN (VEC_SIZE * 1 + 1)(%rdi), %VMM(0), %VMM(1)
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VMOVA (VEC_SIZE * 2 + 1)(%rdi), %VMM(2)
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VPMIN (VEC_SIZE * 3 + 1)(%rdi), %VMM(2), %VMM(3)
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VPMIN %VMM(1), %VMM(3), %VMM(3)
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VPCMPEQ %VMM(3), %VZERO, %VMM(3)
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vpmovmskb %VMM(3), %r8d
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subq $(VEC_SIZE * -4), %rdi
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testl %r8d, %r8d
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jz L(loop_2x_vec)
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addq $(VEC_SIZE * -4 + 1), %rdi
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VPCMPEQ %VMM(0), %VZERO, %VMM(0)
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vpmovmskb %VMM(0), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v0)
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VPCMPEQ %VMM(1), %VZERO, %VMM(1)
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vpmovmskb %VMM(1), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v1)
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VPCMPEQ %VMM(2), %VZERO, %VMM(2)
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vpmovmskb %VMM(2), %ecx
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testl %ecx, %ecx
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jnz L(bsf_and_done_v2)
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movl %r8d, %ecx
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L(bsf_and_done_v3):
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addq $VEC_SIZE, %rdi
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L(bsf_and_done_v2):
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bsfl %ecx, %ecx
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leaq (VEC_SIZE * 2)(%rdi, %rcx), %rdi
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jmp L(strcat_strlen_done)
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.p2align 4,, 4
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L(bsf_and_done_v1):
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addq $VEC_SIZE, %rdi
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L(bsf_and_done_v0):
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bsfl %ecx, %ecx
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addq %rcx, %rdi
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L(strcat_strlen_done):
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