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fix bug with partition sum overflowing

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This commit is contained in:
Josh Coalson 2007-06-20 01:23:49 +00:00
parent f395ec43cf
commit 9fae2451c9
1 changed files with 5 additions and 3 deletions
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8
src/libFLAC/ia32/stream_encoder_asm.nasm
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@ -101,6 +101,7 @@ cident precompute_partition_info_sums_32bit_asm_ia32_
xor eax, edx
sub eax, edx
add ebx, eax ; abs_residual_partition_sum += abs(residual[residual_sample]);
;@@@@@@ check overflow flag and abort here?
add esi, byte 1
cmp esi, edi ; /* since the loop will always run at least once, we can put the loop check down here */
jb .loop1
@ -131,10 +132,11 @@ cident precompute_partition_info_sums_32bit_asm_ia32_
ALIGN 16
.loop3: ; for(i = 0; i < partitions; i++) {
mov eax, [esi]
mov [edi + 4], dword 0
mov ebx, [esi + 4]
add eax, [esi + 8]
adc ebx, [esi + 12]
mov [edi], eax
mov ebx, [esi + 8]
add [edi], ebx ; a_r_p_s[to_partition] = a_r_p_s[from_partition] + a_r_p_s[from_partition+1];
mov [edi + 4], ebx ; a_r_p_s[to_partition] = a_r_p_s[from_partition] + a_r_p_s[from_partition+1];
add esi, byte 16
add edi, byte 8
sub edx, byte 1