mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
e59ced2384
No bug. Optimization are 1. change control flow for L(more_2x_vec) to fall through to loop and jump for L(less_4x_vec) and L(less_8x_vec). This uses less code size and saves jumps for length > 4x VEC_SIZE. 2. For EVEX/AVX512 move L(less_vec) closer to entry. 3. Avoid complex address mode for length > 2x VEC_SIZE 4. Slightly better aligning code for the loop from the perspective of code size and uops. 5. Align targets so they make full use of their fetch block and if possible cache line. 6. Try and reduce total number of icache lines that will need to be pulled in for a given length. 7. Include "local" version of stosb target. For AVX2/EVEX/AVX512 jumping to the stosb target in the sse2 code section will almost certainly be to a new page. The new version does increase code size marginally by duplicating the target but should get better iTLB behavior as a result. test-memset, test-wmemset, and test-bzero are all passing. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
32 lines
668 B
ArmAsm
32 lines
668 B
ArmAsm
#if IS_IN (libc)
|
|
# define USE_WITH_AVX512 1
|
|
|
|
# define VEC_SIZE 64
|
|
# define MOV_SIZE 6
|
|
# define RET_SIZE 1
|
|
|
|
# define XMM0 xmm16
|
|
# define YMM0 ymm16
|
|
# define VEC0 zmm16
|
|
# define VEC(i) VEC##i
|
|
|
|
# define VMOVU vmovdqu64
|
|
# define VMOVA vmovdqa64
|
|
|
|
# define VZEROUPPER
|
|
|
|
# define MEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \
|
|
movq r, %rax; \
|
|
vpbroadcastb d, %VEC0
|
|
|
|
# define WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \
|
|
movq r, %rax; \
|
|
vpbroadcastd d, %VEC0
|
|
|
|
# define SECTION(p) p##.evex512
|
|
# define MEMSET_SYMBOL(p,s) p##_avx512_##s
|
|
# define WMEMSET_SYMBOL(p,s) p##_avx512_##s
|
|
# define USE_LESS_VEC_MASK_STORE 1
|
|
# include "memset-vec-unaligned-erms.S"
|
|
#endif
|