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https://sourceware.org/git/glibc.git
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244b415d38
Just a few QOL changes.
1. Prefer `add` > `lea` as it has high execution units it can run
on.
2. Don't break macro-fusion between `test` and `jcc`
3. Reduce code size by removing gratuitous padding bytes (-90
bytes).
geometric_mean(N=20) of all benchmarks New / Original: 0.959
All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
234 lines
3.8 KiB
ArmAsm
234 lines
3.8 KiB
ArmAsm
/* Optimized wcslen for x86-64 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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#include <sysdep.h>
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.text
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ENTRY (__wcslen)
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cmpl $0, (%rdi)
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jz L(exit_tail0)
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cmpl $0, 4(%rdi)
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jz L(exit_tail1)
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cmpl $0, 8(%rdi)
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jz L(exit_tail2)
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cmpl $0, 12(%rdi)
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jz L(exit_tail3)
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cmpl $0, 16(%rdi)
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jz L(exit_tail4)
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cmpl $0, 20(%rdi)
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jz L(exit_tail5)
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cmpl $0, 24(%rdi)
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jz L(exit_tail6)
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cmpl $0, 28(%rdi)
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jz L(exit_tail7)
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pxor %xmm0, %xmm0
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lea 32(%rdi), %rax
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addq $16, %rdi
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and $-16, %rax
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pcmpeqd (%rax), %xmm0
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pmovmskb %xmm0, %edx
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pxor %xmm1, %xmm1
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm1
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pmovmskb %xmm1, %edx
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pxor %xmm2, %xmm2
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm2
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pmovmskb %xmm2, %edx
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pxor %xmm3, %xmm3
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm3
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pmovmskb %xmm3, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm0
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pmovmskb %xmm0, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm1
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pmovmskb %xmm1, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm2
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pmovmskb %xmm2, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm3
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pmovmskb %xmm3, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm0
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pmovmskb %xmm0, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm1
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pmovmskb %xmm1, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm2
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pmovmskb %xmm2, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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pcmpeqd (%rax), %xmm3
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pmovmskb %xmm3, %edx
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addq $16, %rax
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test %edx, %edx
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jnz L(exit)
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and $-0x40, %rax
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.p2align 4
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L(aligned_64_loop):
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movaps (%rax), %xmm0
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movaps 16(%rax), %xmm1
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movaps 32(%rax), %xmm2
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movaps 48(%rax), %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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addq $64, %rax
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test %edx, %edx
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jz L(aligned_64_loop)
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pcmpeqd -64(%rax), %xmm3
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pmovmskb %xmm3, %edx
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addq $48, %rdi
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test %edx, %edx
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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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addq $-16, %rdi
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test %edx, %edx
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jnz L(exit)
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pcmpeqd -32(%rax), %xmm3
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pmovmskb %xmm3, %edx
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addq $-16, %rdi
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test %edx, %edx
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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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addq $-16, %rdi
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test %edx, %edx
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jz L(aligned_64_loop)
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.p2align 4
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L(exit):
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sub %rdi, %rax
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shr $2, %rax
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test %dl, %dl
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jz L(exit_high)
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andl $15, %edx
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jz L(exit_1)
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ret
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/* No align here. Naturally aligned % 16 == 1. */
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L(exit_high):
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andl $(15 << 8), %edx
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jz L(exit_3)
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add $2, %rax
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ret
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.p2align 3
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L(exit_1):
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add $1, %rax
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ret
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.p2align 3
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L(exit_3):
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add $3, %rax
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ret
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.p2align 3
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L(exit_tail0):
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xorl %eax, %eax
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ret
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.p2align 3
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L(exit_tail1):
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movl $1, %eax
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ret
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.p2align 3
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L(exit_tail2):
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movl $2, %eax
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ret
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.p2align 3
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L(exit_tail3):
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movl $3, %eax
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ret
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.p2align 3
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L(exit_tail4):
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movl $4, %eax
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ret
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.p2align 3
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L(exit_tail5):
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movl $5, %eax
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ret
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.p2align 3
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L(exit_tail6):
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movl $6, %eax
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ret
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.p2align 3
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L(exit_tail7):
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movl $7, %eax
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ret
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END (__wcslen)
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weak_alias(__wcslen, wcslen)
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