diff options
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 16 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 12 |
2 files changed, 2 insertions, 26 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S index 7495324..bd5dc1a 100644 --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S @@ -56,17 +56,6 @@ # endif #endif -/* Threshold to use Enhanced REP MOVSB. Since there is overhead to set - up REP MOVSB operation, REP MOVSB isn't faster on short data. The - memcpy micro benchmark in glibc shows that 2KB is the approximate - value above which REP MOVSB becomes faster than SSE2 optimization - on processors with Enhanced REP MOVSB. Since larger register size - can move more data with a single load and store, the threshold is - higher with larger register size. */ -#ifndef REP_MOVSB_THRESHOLD -# define REP_MOVSB_THRESHOLD (2048 * (VEC_SIZE / 16)) -#endif - #ifndef PREFETCH # define PREFETCH(addr) prefetcht0 addr #endif @@ -253,9 +242,6 @@ L(movsb): leaq (%rsi,%rdx), %r9 cmpq %r9, %rdi /* Avoid slow backward REP MOVSB. */ -# if REP_MOVSB_THRESHOLD <= (VEC_SIZE * 8) -# error Unsupported REP_MOVSB_THRESHOLD and VEC_SIZE! -# endif jb L(more_8x_vec_backward) 1: mov %RDX_LP, %RCX_LP @@ -331,7 +317,7 @@ L(between_2_3): #if defined USE_MULTIARCH && IS_IN (libc) L(movsb_more_2x_vec): - cmpq $REP_MOVSB_THRESHOLD, %rdx + cmp __x86_rep_movsb_threshold(%rip), %RDX_LP ja L(movsb) #endif L(more_2x_vec): diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S index af22997..2bfc95d 100644 --- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S @@ -58,16 +58,6 @@ # endif #endif -/* Threshold to use Enhanced REP STOSB. Since there is overhead to set - up REP STOSB operation, REP STOSB isn't faster on short data. The - memset micro benchmark in glibc shows that 2KB is the approximate - value above which REP STOSB becomes faster on processors with - Enhanced REP STOSB. Since the stored value is fixed, larger register - size has minimal impact on threshold. */ -#ifndef REP_STOSB_THRESHOLD -# define REP_STOSB_THRESHOLD 2048 -#endif - #ifndef SECTION # error SECTION is not defined! #endif @@ -181,7 +171,7 @@ ENTRY (MEMSET_SYMBOL (__memset, unaligned_erms)) ret L(stosb_more_2x_vec): - cmpq $REP_STOSB_THRESHOLD, %rdx + cmp __x86_rep_stosb_threshold(%rip), %RDX_LP ja L(stosb) #endif L(more_2x_vec): |