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ICU-5740 Improve converting ASCII/ISO-8859-1 -> UTF16

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X-SVN-Rev: 21685
This commit is contained in:
George Rhoten 2007-06-10 06:36:08 +00:00
parent cb0ad33fd6
commit c3b6afbcc0
1 changed files with 47 additions and 80 deletions
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127
icu4c/source/common/ucnvlat1.c
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@ -22,9 +22,7 @@
#include "ucnv_cnv.h"
/* control optimizations according to the platform */
#define LATIN1_UNROLL_TO_UNICODE 1
#define LATIN1_UNROLL_FROM_UNICODE 1
#define ASCII_UNROLL_TO_UNICODE 1
/* ISO 8859-1 --------------------------------------------------------------- */
@ -60,53 +58,39 @@ _Latin1ToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
length=targetCapacity;
}
#if LATIN1_UNROLL_TO_UNICODE
if(targetCapacity>=16) {
if(targetCapacity>=8) {
/* This loop is unrolled for speed and improved pipelining. */
int32_t count, loops;
loops=count=targetCapacity>>4;
length=targetCapacity&=0xf;
loops=count=targetCapacity>>3;
length=targetCapacity&=0x7;
do {
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
*target++=*source++;
target[0]=source[0];
target[1]=source[1];
target[2]=source[2];
target[3]=source[3];
target[4]=source[4];
target[5]=source[5];
target[6]=source[6];
target[7]=source[7];
target+=8;
source+=8;
} while(--count>0);
if(offsets!=NULL) {
do {
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
offsets[0]=sourceIndex++;
offsets[1]=sourceIndex++;
offsets[2]=sourceIndex++;
offsets[3]=sourceIndex++;
offsets[4]=sourceIndex++;
offsets[5]=sourceIndex++;
offsets[6]=sourceIndex++;
offsets[7]=sourceIndex++;
offsets+=8;
} while(--loops>0);
}
}
#endif
/* conversion loop */
while(targetCapacity>0) {
@ -513,66 +497,49 @@ _ASCIIToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
targetCapacity=length;
}
#if ASCII_UNROLL_TO_UNICODE
/* unroll the loop with the most common case */
if(targetCapacity>=16) {
if(targetCapacity>=8) {
/* This loop is unrolled for speed and improved pipelining. */
int32_t count, loops;
UChar oredChars;
loops=count=targetCapacity>>4;
loops=count=targetCapacity>>3;
do {
oredChars=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars=target[0]=source[0];
oredChars|=target[1]=source[1];
oredChars|=target[2]=source[2];
oredChars|=target[3]=source[3];
oredChars|=target[4]=source[4];
oredChars|=target[5]=source[5];
oredChars|=target[6]=source[6];
oredChars|=target[7]=source[7];
/* were all 16 entries really valid? */
if(oredChars>0x7f) {
/* no, return to the first of these 16 */
source-=16;
target-=16;
break;
}
source+=8;
target+=8;
} while(--count>0);
count=loops-count;
targetCapacity-=16*count;
targetCapacity-=count*8;
if(offsets!=NULL) {
oldTarget+=16*count;
oldTarget+=count*8;
while(count>0) {
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
offsets[0]=sourceIndex++;
offsets[1]=sourceIndex++;
offsets[2]=sourceIndex++;
offsets[3]=sourceIndex++;
offsets[4]=sourceIndex++;
offsets[5]=sourceIndex++;
offsets[6]=sourceIndex++;
offsets[7]=sourceIndex++;
offsets+=8;
--count;
}
}
}
#endif
/* conversion loop */
c=0;