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minor optimization

This commit is contained in:
Josh Coalson 2007-03-30 00:54:17 +00:00
parent 7e174a4f84
commit 5fa534f56f
1 changed files with 10 additions and 10 deletions
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20
src/libFLAC/ia32/bitreader_asm.nasm
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@ -129,7 +129,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
and ebx, 31 ; ebx = 'i' = # of leading 0 bits in 'b' (eax)
add ecx, ebx ; cbits += i;
add edi, ebx ; uval += i;
add ecx, 1 ; cbits++; /* skip over stop bit */
add ecx, byte 1 ; cbits++; /* skip over stop bit */
test ecx, ~31
jz near .break1 ; if(cbits >= FLAC__BITS_PER_WORD) { /* faster way of testing if(cbits == FLAC__BITS_PER_WORD) */
; crc16_update_word_(br, br->buffer[cwords]);
@ -137,7 +137,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
bswap edx ; edx = br->buffer[cwords] swapped; now we can CRC the bytes from LSByte to MSByte which makes things much easier
mov ecx, [ebp + 28] ; ecx <- br->crc16_align
mov eax, [ebp + 24] ; ax <- br->read_crc (a.k.a. crc)
%if FLAC__PUBLIC_NEEDS_UNDERSCORE
%ifdef FLAC__PUBLIC_NEEDS_UNDERSCORE
mov edi, _FLAC__crc16_table
%else
mov edi, FLAC__crc16_table
@ -176,7 +176,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
mov [ebp + 24], eax ; br->read_crc <- crc
pop edi
add esi, 1 ; cwords++;
add esi, byte 1 ; cwords++;
xor ecx, ecx ; cbits = 0;
; }
jmp near .break1 ; goto break1;
@ -213,7 +213,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
bswap edx ; edx = br->buffer[cwords] swapped; now we can CRC the bytes from LSByte to MSByte which makes things much easier
mov ecx, [ebp + 28] ; ecx <- br->crc16_align
mov eax, [ebp + 24] ; ax <- br->read_crc (a.k.a. crc)
%if FLAC__PUBLIC_NEEDS_UNDERSCORE
%ifdef FLAC__PUBLIC_NEEDS_UNDERSCORE
mov edi, _FLAC__crc16_table
%else
mov edi, FLAC__crc16_table
@ -252,7 +252,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
mov [ebp + 24], eax ; br->read_crc <- crc
pop edi
add esi, 1 ; cwords++;
add esi, byte 1 ; cwords++;
xor ecx, ecx ; cbits = 0;
; /* didn't find stop bit yet, have to keep going... */
; }
@ -291,7 +291,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
and ebx, 31 ; ebx = 'i' = # of leading 0 bits in 'b' (eax)
add ecx, ebx ; cbits += i;
add edi, ebx ; uval += i;
add ecx, 1 ; cbits++; /* skip over stop bit */
add ecx, byte 1 ; cbits++; /* skip over stop bit */
jmp short .break1 ; goto break1;
.c1_next3: ; } else {
sub edi, ecx
@ -345,7 +345,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
;; ebp br
;; [esp] ucbits
sub [esp], edi ; ucbits -= uval;
sub dword [esp], 1 ; ucbits--; /* account for stop bit */
sub dword [esp], byte 1 ; ucbits--; /* account for stop bit */
;
; read binary part
@ -434,7 +434,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
bswap edx ; edx = br->buffer[cwords] swapped; now we can CRC the bytes from LSByte to MSByte which makes things much easier
mov ecx, [ebp + 28] ; ecx <- br->crc16_align
mov eax, [ebp + 24] ; ax <- br->read_crc (a.k.a. crc)
%if FLAC__PUBLIC_NEEDS_UNDERSCORE
%ifdef FLAC__PUBLIC_NEEDS_UNDERSCORE
mov edi, _FLAC__crc16_table
%else
mov edi, FLAC__crc16_table
@ -474,7 +474,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
pop eax
pop ebx
pop edi
add esi, 1 ; cwords++;
add esi, byte 1 ; cwords++;
mov ecx, ebx
sub ecx, eax ; cbits = parameter - n;
jz .break2 ; if(cbits) { /* parameter > n, i.e. if there are still bits left to read, there have to be less than 32 so they will all be in the next word */
@ -543,7 +543,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
neg edi ; edi <- -(int)(uval & 1)
xor edx, edi ; edx <- (uval >> 1 ^ -(int)(uval & 1))
mov [ebx], edx ; *vals <- edx
sub dword [esp + 32], 1 ; --nvals;
sub dword [esp + 32], byte 1 ; --nvals;
jz .finished ; if(nvals == 0) /* jump to finish */
xor edi, edi ; uval = 0;
add dword [esp + 28], 4 ; ++vals