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https://sourceware.org/git/glibc.git
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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>
41 lines
856 B
ArmAsm
41 lines
856 B
ArmAsm
#if IS_IN (libc)
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# define USE_WITH_EVEX 1
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# define VEC_SIZE 32
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# define MOV_SIZE 6
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# define RET_SIZE 1
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# define XMM0 xmm16
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# define YMM0 ymm16
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# define VEC0 ymm16
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# define VEC(i) VEC##i
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# define VMOVU vmovdqu64
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# define VMOVA vmovdqa64
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# define VZEROUPPER
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# define MEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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vpbroadcastb d, %VEC0; \
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movq r, %rax
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# define BZERO_ZERO_VEC0() \
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vpxorq %XMM0, %XMM0, %XMM0
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# define WMEMSET_SET_VEC0_AND_SET_RETURN(d, r) \
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vpbroadcastd d, %VEC0; \
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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##.evex
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# define MEMSET_SYMBOL(p,s) p##_evex_##s
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# define WMEMSET_SYMBOL(p,s) p##_evex_##s
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# define USE_LESS_VEC_MASK_STORE 1
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# include "memset-vec-unaligned-erms.S"
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#endif
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