glibc/sysdeps/x86_64/multiarch/memmove-avx-unaligned-erms.S

#define VEC_SIZE	32
#define VEC(i)		ymm##i
#define VMOVU		vmovdqu
#define VMOVA		vmovdqa

#define SECTION(p)		p##.avx
#define MEMMOVE_SYMBOL(p,s)	p##_avx_##s

#include "memmove-vec-unaligned-erms.S"
Add x86-64 memmove with unaligned load/store and rep movsb Implement x86-64 memmove with unaligned load/store and rep movsb. Support 16-byte, 32-byte and 64-byte vector register sizes. When size <= 8 times of vector register size, there is no check for address overlap bewteen source and destination. Since overhead for overlap check is small when size > 8 times of vector register size, memcpy is an alias of memmove. A single file provides 2 implementations of memmove, one with rep movsb and the other without rep movsb. They share the same codes when size is between 2 times of vector register size and REP_MOVSB_THRESHOLD which is 2KB for 16-byte vector register size and scaled up by large vector register size. Key features: 1. Use overlapping load and store to avoid branch. 2. For size <= 8 times of vector register size, load all sources into registers and store them together. 3. If there is no address overlap bewteen source and destination, copy from both ends with 4 times of vector register size at a time. 4. If address of destination > address of source, backward copy 8 times of vector register size at a time. 5. Otherwise, forward copy 8 times of vector register size at a time. 6. Use rep movsb only for forward copy. Avoid slow backward rep movsb by fallbacking to backward copy 8 times of vector register size at a time. 7. Skip when address of destination == address of source. [BZ #19776] * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add memmove-sse2-unaligned-erms, memmove-avx-unaligned-erms and memmove-avx512-unaligned-erms. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Test __memmove_chk_avx512_unaligned_2, __memmove_chk_avx512_unaligned_erms, __memmove_chk_avx_unaligned_2, __memmove_chk_avx_unaligned_erms, __memmove_chk_sse2_unaligned_2, __memmove_chk_sse2_unaligned_erms, __memmove_avx_unaligned_2, __memmove_avx_unaligned_erms, __memmove_avx512_unaligned_2, __memmove_avx512_unaligned_erms, __memmove_erms, __memmove_sse2_unaligned_2, __memmove_sse2_unaligned_erms, __memcpy_chk_avx512_unaligned_2, __memcpy_chk_avx512_unaligned_erms, __memcpy_chk_avx_unaligned_2, __memcpy_chk_avx_unaligned_erms, __memcpy_chk_sse2_unaligned_2, __memcpy_chk_sse2_unaligned_erms, __memcpy_avx_unaligned_2, __memcpy_avx_unaligned_erms, __memcpy_avx512_unaligned_2, __memcpy_avx512_unaligned_erms, __memcpy_sse2_unaligned_2, __memcpy_sse2_unaligned_erms, __memcpy_erms, __mempcpy_chk_avx512_unaligned_2, __mempcpy_chk_avx512_unaligned_erms, __mempcpy_chk_avx_unaligned_2, __mempcpy_chk_avx_unaligned_erms, __mempcpy_chk_sse2_unaligned_2, __mempcpy_chk_sse2_unaligned_erms, __mempcpy_avx512_unaligned_2, __mempcpy_avx512_unaligned_erms, __mempcpy_avx_unaligned_2, __mempcpy_avx_unaligned_erms, __mempcpy_sse2_unaligned_2, __mempcpy_sse2_unaligned_erms and __mempcpy_erms. * sysdeps/x86_64/multiarch/memmove-avx-unaligned-erms.S: New file. * sysdeps/x86_64/multiarch/memmove-avx512-unaligned-erms.S: Likwise. * sysdeps/x86_64/multiarch/memmove-sse2-unaligned-erms.S: Likwise. * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: Likwise. 2016-03-31 17:04:26 +00:00			`#define VEC_SIZE 32`
			`#define VEC(i) ymm##i`
			`#define VMOVU vmovdqu`
			`#define VMOVA vmovdqa`

			`#define SECTION(p) p##.avx`
			`#define MEMMOVE_SYMBOL(p,s) p##_avx_##s`

			`#include "memmove-vec-unaligned-erms.S"`