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Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.5 KB
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| 1 | /* |
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| 2 | * ==================================================== |
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| 3 | * Copyright (C) 1998, 2002, 2008 by Red Hat Inc. All rights reserved. |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this |
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| 6 | * software is freely granted, provided that this notice |
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| 7 | * is preserved. |
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| 8 | * ==================================================== |
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| 9 | */ |
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| 10 | |
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| 11 | #include "i386mach.h" |
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| 12 | |
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| 13 | .global SYM (memset) |
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| 14 | SOTYPE_FUNCTION(memset) |
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| 15 | |
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| 16 | SYM (memset): |
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| 17 | |
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| 18 | #ifdef __iamcu__ |
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| 19 | pushl edi |
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| 20 | movl eax,edi |
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| 21 | movzbl dl,eax |
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| 22 | mov edi,edx |
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| 23 | rep stosb |
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| 24 | mov edx,eax |
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| 25 | popl edi |
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| 26 | #else |
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| 27 | pushl ebp |
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| 28 | movl esp,ebp |
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| 29 | pushl edi |
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| 30 | movl 8(ebp),edi |
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| 31 | movzbl 12(ebp),eax |
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| 32 | movl 16(ebp),ecx |
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| 33 | cld |
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| 34 | |
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| 35 | #ifndef __OPTIMIZE_SIZE__ |
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| 36 | /* Less than 16 bytes won't benefit from the 'rep stosl' loop. */ |
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| 37 | cmpl $16,ecx |
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| 38 | jbe .L19 |
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| 39 | testl $7,edi |
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| 40 | je .L10 |
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| 41 | |
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| 42 | /* It turns out that 8-byte aligned 'rep stosl' outperforms |
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| 43 | 4-byte aligned on some x86 platforms. */ |
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| 44 | movb al,(edi) |
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| 45 | incl edi |
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| 46 | decl ecx |
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| 47 | testl $7,edi |
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| 48 | je .L10 |
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| 49 | |
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| 50 | movb al,(edi) |
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| 51 | incl edi |
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| 52 | decl ecx |
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| 53 | testl $7,edi |
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| 54 | je .L10 |
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| 55 | |
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| 56 | movb al,(edi) |
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| 57 | incl edi |
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| 58 | decl ecx |
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| 59 | testl $7,edi |
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| 60 | je .L10 |
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| 61 | |
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| 62 | movb al,(edi) |
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| 63 | incl edi |
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| 64 | decl ecx |
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| 65 | testl $7,edi |
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| 66 | je .L10 |
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| 67 | |
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| 68 | movb al,(edi) |
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| 69 | incl edi |
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| 70 | decl ecx |
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| 71 | testl $7,edi |
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| 72 | je .L10 |
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| 73 | |
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| 74 | movb al,(edi) |
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| 75 | incl edi |
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| 76 | decl ecx |
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| 77 | testl $7,edi |
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| 78 | je .L10 |
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| 79 | |
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| 80 | movb al,(edi) |
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| 81 | incl edi |
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| 82 | decl ecx |
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| 83 | |
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| 84 | /* At this point, ecx>8 and edi%8==0. */ |
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| 85 | .L10: |
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| 86 | movb al,ah |
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| 87 | movl eax,edx |
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| 88 | sall $16,edx |
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| 89 | orl edx,eax |
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| 90 | |
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| 91 | movl ecx,edx |
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| 92 | shrl $2,ecx |
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| 93 | andl $3,edx |
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| 94 | rep |
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| 95 | stosl |
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| 96 | movl edx,ecx |
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| 97 | #endif /* not __OPTIMIZE_SIZE__ */ |
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| 98 | |
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| 99 | .L19: |
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| 100 | rep |
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| 101 | stosb |
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| 102 | |
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| 103 | movl 8(ebp),eax |
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| 104 | |
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| 105 | leal -4(ebp),esp |
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| 106 | popl edi |
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| 107 | leave |
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| 108 | #endif |
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| 109 | ret |
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