Misc/abrash-black-book
Watch
1
0
Fork
You've already forked abrash-black-book
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Replace invalid characters with HTML entities

Browse source 
— with —
’ with ’
+ with +
× with x
ç with ç
“ with “
” with ”
‘ with ‘
• with •
– with -
µ with µ
† with †
Fix C++
θ with θ
Yen symbol instead of times
Fix broken apos
Bullet again
E-circumflex
This commit is contained in:
James Gregory 2013-12-30 12:50:32 +11:00
commit 500e7f5654
353 changed files with 5091 additions and 5091 deletions
Download patch file Download diff file Expand all files Collapse all files

32
07-03.html
View file

@ -49,21 +49,21 @@
.data
; Sample string to search through.
SampleString labelbyte
db ‘This is a sample string of a long enough length ’
db ‘so that raw searching speed can outweigh any ’
db ‘extra set-up time that may be required.’,0
db ‘This is a sample string of a long enough length ’
db ‘so that raw searching speed can outweigh any ’
db ‘extra set-up time that may be required.’,0
SAMPLE_STRING_LENGTH equ $-SampleString
; User prompt.
Prompt db ‘Enter character to search for:$’
Prompt db ‘Enter character to search for:$’
; Result status messages.
ByteFoundMsg db 0dh,0ah
db ‘Specified byte found.’,0dh,0ah,‘$’
db ‘Specified byte found.’,0dh,0ah,‘$’
ZeroByteFoundMsg db 0dh, 0ah
db ‘Zero byte encountered.’,0dh,0ah,‘$’
db ‘Zero byte encountered.’,0dh,0ah,‘$’
NoByteFoundMsg db 0dh,0ah
db ‘Buffer exhausted with no match.’, 0dh, 0ah, ‘$’
db ‘Buffer exhausted with no match.’, 0dh, 0ah, ‘$’
.code
Startprocnear
@ -80,12 +80,12 @@ Startprocnear
call SearchMaxLength ;search the buffer
mov dx,offset ByteFoundMsg ;assume we found the byte
jc PrintStatus ;we did find the byte
;we didn’t find the byte, figure out
;we didn’t find the byte, figure out
;whether we found a zero byte or
;ran out of buffer
mov dx,offset NoByteFoundMsg
;assume we didn’t find a zero byte
jcxz PrintStatus ;we didn’t find a zero byte
;assume we didn’t find a zero byte
jcxz PrintStatus ;we didn’t find a zero byte
mov dx,offset ZeroByteFoundMsg ;we found a zero byte
PrintStatus:
mov ah,9 ;DOS print string function
@ -114,25 +114,25 @@ SearchMaxLengthprocnear
SearchMaxLengthLoop:
lodsb ;get the next byte
cmp al,ah ;is this the byte we want?
jz ByteFound ;yes, we’re done with success
jz ByteFound ;yes, we’re done with success
and al,al ;is this the terminating 0 byte?
jz ByteNotFound ;yes, we’re done with failure
loop SearchMaxLengthLoop ;it’s neither, so check the next
jz ByteNotFound ;yes, we’re done with failure
loop SearchMaxLengthLoop ;it’s neither, so check the next
;byte, if any
ByteNotFound:
clc ;return “not found” status
clc ;return “not found” status
ret
ByteFound:
dec si ;point back to the location at which
;we found the searched-for byte
stc ;return “found” status
stc ;return “found” status
ret
SearchMaxLengthendp
end Start
</PRE>
<!-- END CODE //-->
<H3><A NAME="Heading7"></A><FONT COLOR="#000077">Unrolling Loops</FONT></H3>
<P>Listing 7.2 takes a different tack, unrolling the loop so that four bytes are checked for each <B>LOOP</B> performed. The same instructions are used inside the loop in each listing, but Listing 7.2 is arranged so that three-quarters of the <B>LOOP</B>s are eliminated. Listings 7.1 and 7.2 perform exactly the same task, and they use the same instructions in the loop&#151;the searching algorithm hasn&#146;t changed in any way&#151;but we have sequenced the instructions differently in Listing 7.2, and that makes all the difference.</P><P><BR></P>
<P>Listing 7.2 takes a different tack, unrolling the loop so that four bytes are checked for each <B>LOOP</B> performed. The same instructions are used inside the loop in each listing, but Listing 7.2 is arranged so that three-quarters of the <B>LOOP</B>s are eliminated. Listings 7.1 and 7.2 perform exactly the same task, and they use the same instructions in the loop&mdash;the searching algorithm hasn&rsquo;t changed in any way&mdash;but we have sequenced the instructions differently in Listing 7.2, and that makes all the difference.</P><P><BR></P>
<CENTER>
<TABLE BORDER>
<TR>