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minor listing formatting

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This commit is contained in:
Dennis Yurichev 2016-08-11 03:04:43 +03:00
commit 5ece9ece8c
2 changed files with 166 additions and 166 deletions
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78
src/chapter-21.md Normal file → Executable file
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@ -236,7 +236,7 @@ contention. Happily, write-after-read operations do *not* cause
contention. Such operations, as in
```nasm
mov eax,edx ;U-pipe cycle 1
mov eax,edx ;U-pipe cycle 1
sub edx,edxX ;V-pipe cycle 1
```
@ -475,33 +475,33 @@ ckloopsetup:
mov dx,[esi] ;load most of 1st word to
mov bl,[esi+2] ; checksum (last byte loaded in loop)
dec ecx ;any more dwords to checksum?
jz short ckloopend ;no
jz short ckloopend ;no
ckloop:
mov bh,[esi+3] ;cycle 1 U-pipe
add esi,4 ;cycle 1 V-pipe
shl ebx,16 ;cycle 2 U-pipe
;cycle 2 V-pipe idle
; (register contention)
or ebx,edx ;cycle 3 U-pipe
mov dl,[esi] ;cycle 3 V-pipe
add eax,ebx ;cycle 4 U-pipe
mov bl,[esi+2] ;cycle 4 V-pipe
adc eax,0 ;cycle 5 U-pipe
mov dh,[esi+1] ;cycle 5 V-pipe
dec ecx ;cycle 6 U-pipe
jnz ckloop ;cycle 6 V-pipe
mov bh,[esi+3] ;cycle 1 U-pipe
add esi,4 ;cycle 1 V-pipe
shl ebx,16 ;cycle 2 U-pipe
;cycle 2 V-pipe idle
; (register contention)
or ebx,edx ;cycle 3 U-pipe
mov dl,[esi] ;cycle 3 V-pipe
add eax,ebx ;cycle 4 U-pipe
mov bl,[esi+2] ;cycle 4 V-pipe
adc eax,0 ;cycle 5 U-pipe
mov dh,[esi+1] ;cycle 5 V-pipe
dec ecx ;cycle 6 U-pipe
jnz ckloop ;cycle 6 V-pipe
ckloopend:
mov bh,[esi+3] ;checksum the last dword
add ax,dx
adc ax,bx
adc ax,0
mov bh,[esi+3] ;checksum the last dword
add ax,dx
adc ax,bx
adc ax,0
mov edx,eax ;compress the 32-bit checksum
shr edx,16 ; into a 16-bit checksum
add ax,dx
adc eax,0
mov edx,eax ;compress the 32-bit checksum
shr edx,16 ; into a 16-bit checksum
add ax,dx
adc eax,0
ckloopdone:
```
@ -598,29 +598,29 @@ more registers.
jz short ckloopdone ;no, done
add esi,4 ;point to the next dword
noodddword:
mov edx,[esi] ;preload the first dword
mov ebx,[esi+4] ;preload the second dword
dec ecx ;we'll do 1 checksum outside the loop
jz short ckloopend ;only 1 checksum to do
add esi,8 ;point to the next dword
mov edx,[esi] ;preload the first dword
mov ebx,[esi+4] ;preload the second dword
dec ecx ;we'll do 1 checksum outside the loop
jz short ckloopend ;only 1 checksum to do
add esi,8 ;point to the next dword
ckloop:
add eax,edx ;cycle 1 U-pipe
mov edx,[esi] ;cycle 1 V-pipe
adc eax,ebx ;cycle 2 U-pipe
mov ebx,[esi+4] ;cycle 2 V-pipe
adc eax,0 ;cycle 3 U-pipe
add esi,8 ;cycle 3 V-pipe
dec ecx ;cycle 4 U-pipe
jnz ckloop ;cycle 4 V-pipe
add eax,edx ;cycle 1 U-pipe
mov edx,[esi] ;cycle 1 V-pipe
adc eax,ebx ;cycle 2 U-pipe
mov ebx,[esi+4] ;cycle 2 V-pipe
adc eax,0 ;cycle 3 U-pipe
add esi,8 ;cycle 3 V-pipe
dec ecx ;cycle 4 U-pipe
jnz ckloop ;cycle 4 V-pipe
ckloopend:
add eax,edx ;checksum the last two dwords
add eax,edx ;checksum the last two dwords
adc eax,ebx
adc eax,0
ckloopdone:
mov edx,eax ;compress the 32-bit checksum
shr edx,16 ; into a 16-bit checksum
mov edx,eax ;compress the 32-bit checksum
shr edx,16 ; into a 16-bit checksum
add ax,dx
adc eax,0
```