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kolibrios/programs/develop/mtdbg/sort.inc

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