mirror of
https://sourceware.org/git/glibc.git
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Use IFUNC on x86-64 memset
This commit is contained in:
H.J. Lu
Ulrich Drepper
parent
344d0b545d
commit
ff02d5280b
18
ChangeLog
18
ChangeLog
@ -1,3 +1,21 @@
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2010-11-07 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/x86_64/memset.S: Check USE_MULTIARCH and USE_SSE2 for
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IFUNC support.
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* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
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memset-x86-64.
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* sysdeps/x86_64/multiarch/bzero.S: New file.
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* sysdeps/x86_64/multiarch/cacheinfo.c: New file.
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* sysdeps/x86_64/multiarch/memset-x86-64.S: New file.
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* sysdeps/x86_64/multiarch/memset.S: New file.
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* sysdeps/x86_64/multiarch/memset_chk.S: New file.
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* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):
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Set bit_Prefer_SSE_for_memop for Intel processors.
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* sysdeps/x86_64/multiarch/init-arch.h (bit_Prefer_SSE_for_memop):
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Define.
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(index_Prefer_SSE_for_memop): Define.
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(HAS_PREFER_SSE_FOR_MEMOP): Define.
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2010-11-04 Luis Machado <luisgpm@br.ibm.com>
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* sysdeps/powerpc/powerpc32/power7/mempcpy.S: New file.
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@ -24,7 +24,7 @@
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#define __STOS_UPPER_BOUNDARY $65536
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.text
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#ifndef NOT_IN_libc
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#if !defined NOT_IN_libc && !defined USE_MULTIARCH
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ENTRY(__bzero)
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mov %rsi,%rdx /* Adjust parameter. */
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xorl %esi,%esi /* Fill with 0s. */
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@ -34,10 +34,10 @@ weak_alias (__bzero, bzero)
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#endif
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#if defined PIC && !defined NOT_IN_libc
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ENTRY (__memset_chk)
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ENTRY_CHK (__memset_chk)
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cmpq %rdx, %rcx
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jb HIDDEN_JUMPTARGET (__chk_fail)
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END (__memset_chk)
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END_CHK (__memset_chk)
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#endif
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ENTRY (memset)
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L(memset_entry):
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@ -591,157 +591,13 @@ L(A6Q1): mov %dx,-0xe(%rdi)
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L(A7Q0): mov %dl,-0x7(%rdi)
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L(A6Q0): mov %dx,-0x6(%rdi)
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mov %edx,-0x4(%rdi)
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#ifndef USE_MULTIARCH
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jmp L(aligned_now)
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.balign 16
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L(aligned_now):
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cmpl $0x1,__x86_64_preferred_memory_instruction(%rip)
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jg L(SSE_pre)
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L(8byte_move_try):
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cmpq __STOS_LOWER_BOUNDARY,%r8
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jae L(8byte_stos_try)
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.balign 16
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L(8byte_move):
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movq %r8,%rcx
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shrq $7,%rcx
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jz L(8byte_move_skip)
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.p2align 4
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L(8byte_move_loop):
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decq %rcx
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movq %rdx, (%rdi)
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movq %rdx, 8 (%rdi)
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movq %rdx, 16 (%rdi)
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movq %rdx, 24 (%rdi)
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movq %rdx, 32 (%rdi)
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movq %rdx, 40 (%rdi)
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movq %rdx, 48 (%rdi)
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movq %rdx, 56 (%rdi)
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movq %rdx, 64 (%rdi)
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movq %rdx, 72 (%rdi)
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movq %rdx, 80 (%rdi)
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movq %rdx, 88 (%rdi)
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movq %rdx, 96 (%rdi)
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movq %rdx, 104 (%rdi)
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movq %rdx, 112 (%rdi)
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movq %rdx, 120 (%rdi)
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leaq 128 (%rdi),%rdi
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jnz L(8byte_move_loop)
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L(8byte_move_skip):
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andl $127,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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.balign 16
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L(8byte_stos_try):
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mov __x86_64_shared_cache_size(%rip),%r9d // ck largest cache size
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cmpq %r8,%r9 // calculate the lesser of remaining
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cmovaq %r8,%r9 // bytes and largest cache size
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jbe L(8byte_stos)
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L(8byte_move_reuse_try):
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cmp __STOS_UPPER_BOUNDARY,%r8
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jae L(8byte_move)
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.balign 16
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L(8byte_stos):
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movq %r9,%rcx
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andq $-8,%r9
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shrq $3,%rcx
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jz L(8byte_stos_skip)
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xchgq %rax,%rdx
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rep
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stosq
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xchgq %rax,%rdx
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L(8byte_stos_skip):
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subq %r9,%r8
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ja L(8byte_nt_move)
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andl $7,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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.balign 16
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L(8byte_nt_move):
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movq %r8,%rcx
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shrq $7,%rcx
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jz L(8byte_nt_move_skip)
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.balign 16
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L(8byte_nt_move_loop):
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decq %rcx
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movntiq %rdx, (%rdi)
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movntiq %rdx, 8 (%rdi)
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movntiq %rdx, 16 (%rdi)
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movntiq %rdx, 24 (%rdi)
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movntiq %rdx, 32 (%rdi)
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movntiq %rdx, 40 (%rdi)
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movntiq %rdx, 48 (%rdi)
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movntiq %rdx, 56 (%rdi)
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movntiq %rdx, 64 (%rdi)
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movntiq %rdx, 72 (%rdi)
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movntiq %rdx, 80 (%rdi)
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movntiq %rdx, 88 (%rdi)
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movntiq %rdx, 96 (%rdi)
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movntiq %rdx, 104 (%rdi)
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movntiq %rdx, 112 (%rdi)
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movntiq %rdx, 120 (%rdi)
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leaq 128 (%rdi),%rdi
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jnz L(8byte_nt_move_loop)
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sfence
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L(8byte_nt_move_skip):
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andl $127,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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L(SSE_pre):
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#endif
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#if !defined USE_MULTIARCH || defined USE_SSE2
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# fill RegXMM0 with the pattern
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movd %rdx,%xmm0
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punpcklqdq %xmm0,%xmm0
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@ -1342,11 +1198,162 @@ L(SSExDx):
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.short L(SSE15QB)-L(SSE0Q0)
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#endif
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.popsection
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#endif /* !defined USE_MULTIARCH || defined USE_SSE2 */
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.balign 16
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L(aligned_now):
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#ifndef USE_MULTIARCH
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cmpl $0x1,__x86_64_preferred_memory_instruction(%rip)
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jg L(SSE_pre)
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#endif /* USE_MULTIARCH */
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L(8byte_move_try):
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cmpq __STOS_LOWER_BOUNDARY,%r8
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jae L(8byte_stos_try)
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.balign 16
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L(8byte_move):
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movq %r8,%rcx
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shrq $7,%rcx
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jz L(8byte_move_skip)
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.p2align 4
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L(8byte_move_loop):
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decq %rcx
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movq %rdx, (%rdi)
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movq %rdx, 8 (%rdi)
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movq %rdx, 16 (%rdi)
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movq %rdx, 24 (%rdi)
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movq %rdx, 32 (%rdi)
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movq %rdx, 40 (%rdi)
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movq %rdx, 48 (%rdi)
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movq %rdx, 56 (%rdi)
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movq %rdx, 64 (%rdi)
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movq %rdx, 72 (%rdi)
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movq %rdx, 80 (%rdi)
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movq %rdx, 88 (%rdi)
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movq %rdx, 96 (%rdi)
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movq %rdx, 104 (%rdi)
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movq %rdx, 112 (%rdi)
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movq %rdx, 120 (%rdi)
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leaq 128 (%rdi),%rdi
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jnz L(8byte_move_loop)
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L(8byte_move_skip):
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andl $127,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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.balign 16
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L(8byte_stos_try):
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mov __x86_64_shared_cache_size(%rip),%r9d // ck largest cache size
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cmpq %r8,%r9 // calculate the lesser of remaining
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cmovaq %r8,%r9 // bytes and largest cache size
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jbe L(8byte_stos)
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L(8byte_move_reuse_try):
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cmp __STOS_UPPER_BOUNDARY,%r8
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jae L(8byte_move)
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.balign 16
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L(8byte_stos):
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movq %r9,%rcx
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andq $-8,%r9
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shrq $3,%rcx
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jz L(8byte_stos_skip)
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xchgq %rax,%rdx
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rep
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stosq
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xchgq %rax,%rdx
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L(8byte_stos_skip):
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subq %r9,%r8
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ja L(8byte_nt_move)
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andl $7,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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.balign 16
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L(8byte_nt_move):
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movq %r8,%rcx
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shrq $7,%rcx
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jz L(8byte_nt_move_skip)
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.balign 16
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L(8byte_nt_move_loop):
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decq %rcx
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movntiq %rdx, (%rdi)
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movntiq %rdx, 8 (%rdi)
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movntiq %rdx, 16 (%rdi)
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movntiq %rdx, 24 (%rdi)
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movntiq %rdx, 32 (%rdi)
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movntiq %rdx, 40 (%rdi)
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movntiq %rdx, 48 (%rdi)
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movntiq %rdx, 56 (%rdi)
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movntiq %rdx, 64 (%rdi)
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movntiq %rdx, 72 (%rdi)
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movntiq %rdx, 80 (%rdi)
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movntiq %rdx, 88 (%rdi)
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movntiq %rdx, 96 (%rdi)
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movntiq %rdx, 104 (%rdi)
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movntiq %rdx, 112 (%rdi)
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movntiq %rdx, 120 (%rdi)
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leaq 128 (%rdi),%rdi
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jnz L(8byte_nt_move_loop)
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sfence
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L(8byte_nt_move_skip):
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andl $127,%r8d
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lea (%rdi,%r8,1),%rdi
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#ifndef PIC
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lea L(setPxQx)(%rip),%r11
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jmpq *(%r11,%r8,8) # old scheme remained for nonPIC
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#else
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lea L(Got0)(%rip),%r11
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lea L(setPxQx)(%rip),%rcx
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movswq (%rcx,%r8,2),%rcx
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lea (%rcx,%r11,1),%r11
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jmpq *%r11
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#endif
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END (memset)
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libc_hidden_builtin_def (memset)
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#if defined PIC && !defined NOT_IN_libc
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#if defined PIC && !defined NOT_IN_libc && !defined USE_MULTIARCH
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strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
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.section .gnu.warning.__memset_zero_constant_len_parameter
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.string "memset used with constant zero length parameter; this could be due to transposed parameters"
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@ -8,7 +8,8 @@ sysdep_routines += stpncpy-c strncpy-c strcmp-ssse3 strncmp-ssse3 \
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strend-sse4 memcmp-sse4 memcpy-ssse3 mempcpy-ssse3 \
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memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
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memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3 \
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strncase_l-ssse3 strlen-sse4 strlen-no-bsf
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strncase_l-ssse3 strlen-sse4 strlen-no-bsf \
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memset-x86-64
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ifeq (yes,$(config-cflags-sse4))
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sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c varshift
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CFLAGS-varshift.c += -msse4
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56
sysdeps/x86_64/multiarch/bzero.S
Normal file
56
sysdeps/x86_64/multiarch/bzero.S
Normal file
@ -0,0 +1,56 @@
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/* Multiple versions of bzero
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Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
|
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The GNU C Library is distributed in the hope that it will be useful,
|
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
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License along with the GNU C Library; if not, write to the Free
|
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <init-arch.h>
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.text
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ENTRY(__bzero)
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.type __bzero, @gnu_indirect_function
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cmpl $0, __cpu_features+KIND_OFFSET(%rip)
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jne 1f
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call __init_cpu_features
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1: leaq __bzero_x86_64(%rip), %rax
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testl $bit_Prefer_SSE_for_memop, __cpu_features+FEATURE_OFFSET+index_Prefer_SSE_for_memop(%rip)
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jz 2f
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leaq __bzero_sse2(%rip), %rax
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2: ret
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END(__bzero)
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.type __bzero_sse2, @function
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__bzero_sse2:
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cfi_startproc
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CALL_MCOUNT
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mov %rsi,%rdx /* Adjust parameter. */
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xorl %esi,%esi /* Fill with 0s. */
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jmp __memset_sse2
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cfi_endproc
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.size __bzero_sse2, .-__bzero_sse2
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.type __bzero_x86_64, @function
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__bzero_x86_64:
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cfi_startproc
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CALL_MCOUNT
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mov %rsi,%rdx /* Adjust parameter. */
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xorl %esi,%esi /* Fill with 0s. */
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jmp __memset_x86_64
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cfi_endproc
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.size __bzero_x86_64, .-__bzero_x86_64
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weak_alias (__bzero, bzero)
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2
sysdeps/x86_64/multiarch/cacheinfo.c
Normal file
2
sysdeps/x86_64/multiarch/cacheinfo.c
Normal file
@ -0,0 +1,2 @@
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#define DISABLE_PREFERRED_MEMORY_INSTRUCTION
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#include "../cacheinfo.c"
|
||||
@ -59,6 +59,11 @@ __init_cpu_features (void)
|
||||
|
||||
get_common_indeces (&family, &model);
|
||||
|
||||
/* Intel processors prefer SSE instruction for memory/string
|
||||
routines if they are avaiable. */
|
||||
__cpu_features.feature[index_Prefer_SSE_for_memop]
|
||||
|= bit_Prefer_SSE_for_memop;
|
||||
|
||||
unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
|
||||
unsigned int extended_family = (eax >> 20) & 0xff;
|
||||
unsigned int extended_model = (eax >> 12) & 0xf0;
|
||||
|
||||
@ -16,9 +16,10 @@
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#define bit_Fast_Rep_String (1 << 0)
|
||||
#define bit_Fast_Copy_Backward (1 << 1)
|
||||
#define bit_Slow_BSF (1 << 2)
|
||||
#define bit_Fast_Rep_String (1 << 0)
|
||||
#define bit_Fast_Copy_Backward (1 << 1)
|
||||
#define bit_Slow_BSF (1 << 2)
|
||||
#define bit_Prefer_SSE_for_memop (1 << 3)
|
||||
|
||||
#ifdef __ASSEMBLER__
|
||||
|
||||
@ -37,6 +38,7 @@
|
||||
# define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE
|
||||
# define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE
|
||||
# define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE
|
||||
# define index_Prefer_SSE_for_memop FEATURE_INDEX_1*FEATURE_SIZE
|
||||
|
||||
#else /* __ASSEMBLER__ */
|
||||
|
||||
@ -109,6 +111,7 @@ extern const struct cpu_features *__get_cpu_features (void)
|
||||
# define index_Fast_Rep_String FEATURE_INDEX_1
|
||||
# define index_Fast_Copy_Backward FEATURE_INDEX_1
|
||||
# define index_Slow_BSF FEATURE_INDEX_1
|
||||
# define index_Prefer_SSE_for_memop FEATURE_INDEX_1
|
||||
|
||||
#define HAS_ARCH_FEATURE(idx, bit) \
|
||||
((__get_cpu_features ()->feature[idx] & (bit)) != 0)
|
||||
@ -122,4 +125,7 @@ extern const struct cpu_features *__get_cpu_features (void)
|
||||
#define HAS_SLOW_BSF \
|
||||
HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
|
||||
|
||||
#define HAS_PREFER_SSE_FOR_MEMOP \
|
||||
HAS_ARCH_FEATURE (index_Prefer_SSE_for_memop, bit_Prefer_SSE_for_memop)
|
||||
|
||||
#endif /* __ASSEMBLER__ */
|
||||
|
||||
18
sysdeps/x86_64/multiarch/memset-x86-64.S
Normal file
18
sysdeps/x86_64/multiarch/memset-x86-64.S
Normal file
@ -0,0 +1,18 @@
|
||||
#include <sysdep.h>
|
||||
|
||||
#ifndef NOT_IN_libc
|
||||
# undef ENTRY_CHK
|
||||
# define ENTRY_CHK(name) \
|
||||
.type __memset_chk_x86_64, @function; \
|
||||
.globl __memset_chk_x86_64; \
|
||||
.p2align 4; \
|
||||
__memset_chk_x86_64: cfi_startproc; \
|
||||
CALL_MCOUNT
|
||||
# undef END_CHK
|
||||
# define END_CHK(name) \
|
||||
cfi_endproc; .size __memset_chk_x86_64, .-__memset_chk_x86_64
|
||||
|
||||
# define libc_hidden_builtin_def(name)
|
||||
# define memset __memset_x86_64
|
||||
# include "../memset.S"
|
||||
#endif
|
||||
74
sysdeps/x86_64/multiarch/memset.S
Normal file
74
sysdeps/x86_64/multiarch/memset.S
Normal file
@ -0,0 +1,74 @@
|
||||
/* Multiple versions of memset
|
||||
Copyright (C) 2010 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <sysdep.h>
|
||||
#include <init-arch.h>
|
||||
|
||||
/* Define multiple versions only for the definition in lib. */
|
||||
#ifndef NOT_IN_libc
|
||||
ENTRY(memset)
|
||||
.type memset, @gnu_indirect_function
|
||||
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
|
||||
jne 1f
|
||||
call __init_cpu_features
|
||||
1: leaq __memset_x86_64(%rip), %rax
|
||||
testl $bit_Prefer_SSE_for_memop, __cpu_features+FEATURE_OFFSET+index_Prefer_SSE_for_memop(%rip)
|
||||
jz 2f
|
||||
leaq __memset_sse2(%rip), %rax
|
||||
2: ret
|
||||
END(memset)
|
||||
|
||||
# define USE_SSE2 1
|
||||
|
||||
# undef ENTRY
|
||||
# define ENTRY(name) \
|
||||
.type __memset_sse2, @function; \
|
||||
.globl __memset_sse2; \
|
||||
.p2align 4; \
|
||||
__memset_sse2: cfi_startproc; \
|
||||
CALL_MCOUNT
|
||||
# undef END
|
||||
# define END(name) \
|
||||
cfi_endproc; .size __memset_sse2, .-__memset_sse2
|
||||
|
||||
# undef ENTRY_CHK
|
||||
# define ENTRY_CHK(name) \
|
||||
.type __memset_chk_sse2, @function; \
|
||||
.globl __memset_chk_sse2; \
|
||||
.p2align 4; \
|
||||
__memset_chk_sse2: cfi_startproc; \
|
||||
CALL_MCOUNT
|
||||
# undef END_CHK
|
||||
# define END_CHK(name) \
|
||||
cfi_endproc; .size __memset_chk_sse2, .-__memset_chk_sse2
|
||||
|
||||
# ifdef SHARED
|
||||
# undef libc_hidden_builtin_def
|
||||
/* It doesn't make sense to send libc-internal memset calls through a PLT.
|
||||
The speedup we get from using GPR instruction is likely eaten away
|
||||
by the indirect call in the PLT. */
|
||||
# define libc_hidden_builtin_def(name) \
|
||||
.globl __GI_memset; __GI_memset = __memset_sse2
|
||||
# endif
|
||||
|
||||
# undef strong_alias
|
||||
# define strong_alias(original, alias)
|
||||
#endif
|
||||
|
||||
#include "../memset.S"
|
||||
44
sysdeps/x86_64/multiarch/memset_chk.S
Normal file
44
sysdeps/x86_64/multiarch/memset_chk.S
Normal file
@ -0,0 +1,44 @@
|
||||
/* Multiple versions of __memset_chk
|
||||
Copyright (C) 2010 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <sysdep.h>
|
||||
#include <init-arch.h>
|
||||
|
||||
/* Define multiple versions only for the definition in lib. */
|
||||
#ifndef NOT_IN_libc
|
||||
# ifdef SHARED
|
||||
ENTRY(__memset_chk)
|
||||
.type __memset_chk, @gnu_indirect_function
|
||||
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
|
||||
jne 1f
|
||||
call __init_cpu_features
|
||||
1: leaq __memset_chk_x86_64(%rip), %rax
|
||||
testl $bit_Prefer_SSE_for_memop, __cpu_features+FEATURE_OFFSET+index_Prefer_SSE_for_memop(%rip)
|
||||
jz 2f
|
||||
leaq __memset_chk_sse2(%rip), %rax
|
||||
2: ret
|
||||
END(__memset_chk)
|
||||
|
||||
strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
|
||||
.section .gnu.warning.__memset_zero_constant_len_parameter
|
||||
.string "memset used with constant zero length parameter; this could be due to transposed parameters"
|
||||
# else
|
||||
# include "../memset_chk.S"
|
||||
# endif
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user