26 
  27         .file   "memset.s"
  28 
  29 #include <sys/asm_linkage.h>
  30 
  31         ANSI_PRAGMA_WEAK(memset,function)
  32 
  33         ENTRY(memset)
  34         pushl   %edi            / save register variable
  35         movl    8(%esp),%edi    / %edi = string address
  36         movl    12(%esp),%eax   / %al = byte to duplicate
  37         movl    16(%esp),%ecx   / %ecx = number of copies
  38 
  39         / For all basic blocks in this routine, maintain the following
  40         / entry conditions:     %eax each byte is set to desired byte.
  41         /                       NOTE: .byteset doesn't require this
  42         /                       %ecx contains # bytes to set
  43         /                       %edi contain address to set
  44 
  45         cld                     / make sure we go the right way...
  46         cmpl    $20,%ecx        / strings with fewer than 20 chars should be byte set

  47         jbe     .byteset        
  48 
  49         andl    $0xff, %eax     / trim anything above low byte
  50         imul    $0x01010101, %eax       / extend low byte to each byte
  51         
  52         cmpl    $256, %ecx      / smaller areas don't benefit from alignment
  53         jbe     .wordset
  54 
  55         cmpl    $511, %ecx      / areas smaller than this should be wordset
  56         jbe     .check_wordset  
  57 
  58         /
  59         / prep work for sse temporal and non-temporal
  60         /
  61 
  62         pushl   %ebx            / more registers are needed
  63         pushl   %esi            / for alignment work
  64 
  65         /
  66         / align address to 64 byte boundaries.

  26 
  27         .file   "memset.s"
  28 
  29 #include <sys/asm_linkage.h>
  30 
  31         ANSI_PRAGMA_WEAK(memset,function)
  32 
  33         ENTRY(memset)
  34         pushl   %edi            / save register variable
  35         movl    8(%esp),%edi    / %edi = string address
  36         movl    12(%esp),%eax   / %al = byte to duplicate
  37         movl    16(%esp),%ecx   / %ecx = number of copies
  38 
  39         / For all basic blocks in this routine, maintain the following
  40         / entry conditions:     %eax each byte is set to desired byte.
  41         /                       NOTE: .byteset doesn't require this
  42         /                       %ecx contains # bytes to set
  43         /                       %edi contain address to set
  44 
  45         cld                     / make sure we go the right way...
  46         cmpl    $20,%ecx        / strings with fewer than 20 chars should be
  47                                 / byte set
  48         jbe     .byteset
  49 
  50         andl    $0xff, %eax     / trim anything above low byte
  51         imul    $0x01010101, %eax       / extend low byte to each byte
  52 
  53         cmpl    $256, %ecx      / smaller areas don't benefit from alignment
  54         jbe     .wordset
  55 
  56         cmpl    $511, %ecx      / areas smaller than this should be wordset
  57         jbe     .check_wordset
  58 
  59         /
  60         / prep work for sse temporal and non-temporal
  61         /
  62 
  63         pushl   %ebx            / more registers are needed
  64         pushl   %esi            / for alignment work
  65 
  66         /
  67         / align address to 64 byte boundaries.