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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:
1.7 KB
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| 1 | /* |
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| 2 | * ==================================================== |
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| 3 | * Copyright (C) 1998, 2002 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 (memcmp) |
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| 14 | SOTYPE_FUNCTION(memcmp) |
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| 15 | |
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| 16 | SYM (memcmp): |
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| 17 | |
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| 18 | #ifdef __iamcu__ |
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| 19 | pushl edi |
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| 20 | pushl esi |
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| 21 | movl eax,edi |
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| 22 | movl edx,esi |
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| 23 | cld |
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| 24 | |
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| 25 | /* check if length is zero in which case just return 0 */ |
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| 26 | |
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| 27 | xorl eax,eax |
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| 28 | testl ecx,ecx |
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| 29 | jz L4 |
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| 30 | |
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| 31 | /* compare any unaligned bytes or remainder bytes */ |
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| 32 | repz |
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| 33 | cmpsb |
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| 34 | |
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| 35 | /* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */ |
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| 36 | xorl edx,edx |
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| 37 | movb -1(esi),dl |
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| 38 | movb -1(edi),al |
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| 39 | subl edx,eax |
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| 40 | |
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| 41 | L4: |
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| 42 | popl esi |
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| 43 | popl edi |
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| 44 | #else |
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| 45 | pushl ebp |
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| 46 | movl esp,ebp |
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| 47 | subl $16,esp |
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| 48 | pushl ebx |
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| 49 | pushl edi |
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| 50 | pushl esi |
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| 51 | movl 8(ebp),edi |
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| 52 | movl 12(ebp),esi |
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| 53 | movl 16(ebp),ecx |
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| 54 | cld |
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| 55 | |
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| 56 | /* check if length is zero in which case just return 0 */ |
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| 57 | |
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| 58 | xorl eax,eax |
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| 59 | testl ecx,ecx |
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| 60 | jz L4 |
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| 61 | |
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| 62 | #ifndef __OPTIMIZE_SIZE__ |
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| 63 | |
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| 64 | /* if aligned on long boundary, compare doublewords at a time first */ |
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| 65 | |
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| 66 | movl edi,eax |
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| 67 | orl esi,eax |
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| 68 | testb $3,al |
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| 69 | jne BYTECMP |
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| 70 | movl ecx,ebx |
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| 71 | shrl $2,ecx /* calculate number of long words to compare */ |
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| 72 | repz |
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| 73 | cmpsl |
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| 74 | jz L5 |
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| 75 | subl $4,esi |
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| 76 | subl $4,edi |
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| 77 | movl $4,ecx |
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| 78 | jmp BYTECMP |
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| 79 | L5: |
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| 80 | andl $3,ebx /* calculate number of remaining bytes */ |
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| 81 | movl ebx,ecx |
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| 82 | |
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| 83 | #endif /* not __OPTIMIZE_SIZE__ */ |
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| 84 | |
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| 85 | BYTECMP: /* compare any unaligned bytes or remainder bytes */ |
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| 86 | repz |
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| 87 | cmpsb |
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| 88 | |
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| 89 | /* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */ |
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| 90 | L3: |
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| 91 | xorl edx,edx |
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| 92 | movb -1(esi),dl |
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| 93 | xorl eax,eax |
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| 94 | movb -1(edi),al |
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| 95 | subl edx,eax |
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| 96 | |
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| 97 | L4: |
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| 98 | leal -28(ebp),esp |
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| 99 | popl esi |
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| 100 | popl edi |
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| 101 | popl ebx |
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| 102 | leave |
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| 103 | #endif |
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| 104 | ret |
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