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minor optimization in loop logic

This commit is contained in:
Josh Coalson 2007-04-04 01:02:21 +00:00
parent 717ea8c398
commit 566f373d71
1 changed files with 4 additions and 6 deletions
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10
src/libFLAC/ia32/stream_encoder_asm.nasm
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@ -93,27 +93,25 @@ cident precompute_partition_info_sums_32bit_asm_ia32_
xor esi, esi ; esi <- residual_sample = 0
ALIGN 16
.loop0: ; for(partition = residual_sample = 0; partition < partitions; partition++) {
cmp ecx, [esp]
jae .next0
add edi, [esp + 4] ; end += default_partition_samples;
xor ebx, ebx ; abs_residual_partition_sum = 0;
ALIGN 16;@@@ OPT: remove?
.loop1: ; for( ; residual_sample < end; residual_sample++)
cmp esi, edi
jae .next1
mov eax, [ebp + esi * 4]
cdq
xor eax, edx
sub eax, edx
add ebx, eax ; abs_residual_partition_sum += abs(residual[residual_sample]);
add esi, byte 1
jmp .loop1
cmp esi, edi ; /* since the loop will always run at least once, we can put the loop check down here */
jb .loop1
.next1:
mov eax, [esp + 32]
mov [eax + ecx * 8], ebx ; abs_residual_partition_sums[partition] = abs_residual_partition_sum;
mov [eax + ecx * 8 + 4], dword 0
add ecx, byte 1
jmp .loop0
cmp ecx, [esp] ; /* since the loop will always run at least once, we can put the loop check down here */
jb .loop0
.next0: ; }
;
; now merge partitions for lower orders