78 lines
1.6 KiB
PHP
78 lines
1.6 KiB
PHP
; Sorting bunch of dwords, count = ecx, locating at address = edx,
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; comparison function at ebx
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; Destroy content of eax, ecx, esi, edi
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sort:
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jecxz .done
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mov eax, ecx
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@@:
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push eax
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call .restore
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pop eax
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dec eax
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jnz @b
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@@:
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cmp ecx, 1
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jz .done
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mov esi, 1
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mov edi, ecx
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call .exchange
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dec ecx
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mov eax, 1
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call .restore
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jmp @b
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.done:
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ret
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.exchange:
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push eax ecx
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mov eax, [edx+esi*4-4]
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mov ecx, [edx+edi*4-4]
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mov [edx+esi*4-4], ecx
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mov [edx+edi*4-4], eax
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pop ecx eax
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ret
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.restore:
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lea esi, [eax+eax]
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cmp esi, ecx
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ja .donerr
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push esi
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mov esi, [edx+esi*4-4]
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mov edi, [edx+eax*4-4]
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call ebx
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pop esi
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ja .need_xchg
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cmp esi, ecx
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jae .donerr
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push esi
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mov esi, [edx+esi*4]
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mov edi, [edx+eax*4-4]
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call ebx
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pop esi
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jbe .donerr
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.need_xchg:
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cmp esi, ecx
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jz .do_xchg
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push esi
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mov edi, [edx+esi*4-4]
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mov esi, [edx+esi*4]
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call ebx
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pop esi
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sbb esi, -1
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.do_xchg:
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mov edi, eax
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call .exchange
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mov eax, esi
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jmp .restore
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.donerr:
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ret
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; vim: ft=fasm tabstop=4
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