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3d9f171bfb
memset with zero as the value to set is by far the majority value (99%+ for Python3 and GCC). bzero can be slightly more optimized for this case by using a zero-idiom xor for broadcasting the set value to a register (vector or GPR). Co-developed-by: Noah Goldstein <goldstein.w.n@gmail.com>
78 lines
2.0 KiB
ArmAsm
78 lines
2.0 KiB
ArmAsm
/* memset/bzero -- set memory area to CH/0
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Optimized version for x86-64.
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Copyright (C) 2002-2022 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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#define USE_WITH_SSE2 1
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#define VEC_SIZE 16
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#define MOV_SIZE 3
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#define RET_SIZE 1
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#define VEC(i) xmm##i
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#define VMOVU movups
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#define VMOVA movaps
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# define MEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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movd d, %xmm0; \
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movq r, %rax; \
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punpcklbw %xmm0, %xmm0; \
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punpcklwd %xmm0, %xmm0; \
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pshufd $0, %xmm0, %xmm0
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# define BZERO_ZERO_VEC0() \
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pxor %xmm0, %xmm0
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# define WMEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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movd d, %xmm0; \
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pshufd $0, %xmm0, %xmm0; \
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movq r, %rax
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# define MEMSET_VDUP_TO_VEC0_HIGH()
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# define MEMSET_VDUP_TO_VEC0_LOW()
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# define WMEMSET_VDUP_TO_VEC0_HIGH()
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# define WMEMSET_VDUP_TO_VEC0_LOW()
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#define SECTION(p) p
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#ifndef MEMSET_SYMBOL
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# define MEMSET_CHK_SYMBOL(p,s) p
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# define MEMSET_SYMBOL(p,s) memset
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#endif
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#ifndef BZERO_SYMBOL
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# define BZERO_SYMBOL(p,s) __bzero
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#endif
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#ifndef WMEMSET_SYMBOL
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# define WMEMSET_CHK_SYMBOL(p,s) p
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# define WMEMSET_SYMBOL(p,s) __wmemset
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#endif
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#include "multiarch/memset-vec-unaligned-erms.S"
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libc_hidden_builtin_def (memset)
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#if IS_IN (libc)
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weak_alias (__bzero, bzero)
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libc_hidden_def (__wmemset)
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weak_alias (__wmemset, wmemset)
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libc_hidden_weak (wmemset)
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#endif
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