diff options
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 6 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 5 |
3 files changed, 19 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 8cabe673ab..87c3f3df54 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2018-05-23 H.J. Lu <hongjiu.lu@intel.com> + + * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S + (__mempcpy_erms): Skip zero length. + (__memmove_erms): Likewise. + * sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S + (__memset_erms): Likewise. + 2018-05-23 Joseph Myers <joseph@codesourcery.com> * sysdeps/alpha/Implies: Remove alpha/soft-fp. diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S index 1404131bb7..e2ede45e9f 100644 --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S @@ -156,6 +156,9 @@ END (__mempcpy_chk_erms) /* Only used to measure performance of REP MOVSB. */ ENTRY (__mempcpy_erms) movq %rdi, %rax + /* Skip zero length. */ + testq %rdx, %rdx + jz 2f addq %rdx, %rax jmp L(start_movsb) END (__mempcpy_erms) @@ -167,6 +170,9 @@ END (__memmove_chk_erms) ENTRY (__memmove_erms) movq %rdi, %rax + /* Skip zero length. */ + testq %rdx, %rdx + jz 2f L(start_movsb): movq %rdx, %rcx cmpq %rsi, %rdi diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S index 0a827f3e47..dc9cb88b37 100644 --- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S @@ -128,6 +128,11 @@ END (__memset_chk_erms) /* Only used to measure performance of REP STOSB. */ ENTRY (__memset_erms) + /* Skip zero length. */ + testq %rdx, %rdx + jnz L(stosb) + movq %rdi, %rax + ret # else /* Provide a hidden symbol to debugger. */ .hidden MEMSET_SYMBOL (__memset, erms) |