61 lines
1.3 KiB
PHP
61 lines
1.3 KiB
PHP
; Sort array of unsigned dwords in non-decreasing order.
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; ecx = array size, edx = array pointer.
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; Destroys eax, ecx, esi, edi.
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sort:
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test ecx, ecx
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jz .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 .doner
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mov edi, [edx+eax*4-4]
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cmp [edx+esi*4-4], edi
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ja .need_xchg
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cmp esi, ecx
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jae .doner
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mov edi, [edx+eax*4-4]
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cmp [edx+esi*4], edi
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jbe .doner
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.need_xchg:
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cmp esi, ecx
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jz .do_xchg
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mov edi, [edx+esi*4-4]
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cmp [edx+esi*4], edi
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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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.doner:
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ret
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