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Minor optimizations (loop unrolling) to LZW functions in cache1d, improves throughput ~20% on my i7

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git-svn-id: https://svn.eduke32.com/eduke32@4665 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
terminx 2014-10-25 03:31:41 +00:00
parent d74a6a7e5d
commit 0cf527914f
1 changed files with 88 additions and 18 deletions
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106
polymer/eduke32/build/src/cache1d.c
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@ -1468,8 +1468,17 @@ C1D_STATIC int32_t c1d_read_compressed(void *buffer, bsize_t dasizeof, bsize_t c
if (dasizeof > LZWSIZE)
{
count *= dasizeof;
dasizeof = 1;
if (count > LZWSIZE)
{
count *= dasizeof;
dasizeof = 1;
}
else
{
i = count;
count = dasizeof;
dasizeof = i;
}
}
ptr = (char *)buffer;
@ -1488,7 +1497,18 @@ C1D_STATIC int32_t c1d_read_compressed(void *buffer, bsize_t dasizeof, bsize_t c
if (k) return -1;
}
for (j=0; j<dasizeof; j++)
j = 0;
if (dasizeof >= 4)
{
for (; j<dasizeof-4; j+=4)
{
ptr[j+dasizeof] = ((ptr[j]+lzwrawbuf[j+k])&255); ptr[j+1+dasizeof] = ((ptr[j+1]+lzwrawbuf[j+1+k])&255);
ptr[j+2+dasizeof] = ((ptr[j+2]+lzwrawbuf[j+2+k])&255); ptr[j+3+dasizeof] = ((ptr[j+3]+lzwrawbuf[j+3+k])&255);
}
}
for (; j<dasizeof; j++)
ptr[j+dasizeof] = ((ptr[j]+lzwrawbuf[j+k])&255);
k += dasizeof;
@ -1521,16 +1541,23 @@ static uint32_t compress_part(uint32_t k, intptr_t f)
C1D_STATIC void c1d_write_compressed(const void *buffer, bsize_t dasizeof, bsize_t count, intptr_t f)
{
uint32_t i, j, k;
const char *ptr;
const char *ptr = (char*)buffer;
if (dasizeof > LZWSIZE)
if (dasizeof > LZWSIZE && count > LZWSIZE)
{
count *= dasizeof;
dasizeof = 1;
if (count > LZWSIZE)
{
count *= dasizeof;
dasizeof = 1;
}
else
{
i = count;
count = dasizeof;
dasizeof = i;
}
}
ptr = (char*)buffer;
Bmemcpy(lzwrawbuf, ptr, (int32_t)dasizeof);
k = dasizeof;
@ -1539,7 +1566,18 @@ C1D_STATIC void c1d_write_compressed(const void *buffer, bsize_t dasizeof, bsize
for (i=1; i<count; i++)
{
for (j=0; j<dasizeof; j++)
j = 0;
if (dasizeof >= 4)
{
for (; j<dasizeof-4; j+=4)
{
lzwrawbuf[j+k] = ((ptr[j+dasizeof]-ptr[j])&255); lzwrawbuf[j+1+k] = ((ptr[j+1+dasizeof]-ptr[j+1])&255);
lzwrawbuf[j+2+k] = ((ptr[j+2+dasizeof]-ptr[j+2])&255); lzwrawbuf[j+3+k] = ((ptr[j+3+dasizeof]-ptr[j+3])&255);
}
}
for (; j<dasizeof; j++)
lzwrawbuf[j+k] = ((ptr[j+dasizeof]-ptr[j])&255);
k += dasizeof;
@ -1569,7 +1607,16 @@ static int32_t lzwcompress(const char *lzwinbuf, int32_t uncompleng, char *lzwou
int16_t *const lzwcodehead = lzwbuf2;
int16_t *const lzwcodenext = lzwbuf3;
for (i=255; i>=0; i--)
for (i=255; i>=4; i-=4)
{
lzwtmpbuf[i] = i, lzwcodenext[i] = (i+1)&255;
lzwtmpbuf[i-1] = i-1, lzwcodenext[i-1] = (i) &255;
lzwtmpbuf[i-2] = i-2, lzwcodenext[i-2] = (i-1)&255;
lzwtmpbuf[i-3] = i-3, lzwcodenext[i-3] = (i-2)&255;
lzwcodehead[i] = lzwcodehead[i-1] = lzwcodehead[i-2] = lzwcodehead[i-3] = -1;
}
for (; i>=0; i--)
{
lzwtmpbuf[i] = i;
lzwcodenext[i] = (i+1)&255;
@ -1588,8 +1635,7 @@ static int32_t lzwcompress(const char *lzwinbuf, int32_t uncompleng, char *lzwou
{
int32_t newaddr;
bytecnt1++;
if (bytecnt1 == uncompleng)
if (++bytecnt1 == uncompleng)
break; // (*) see XXX below
if (lzwcodehead[addr] < 0)
@ -1648,7 +1694,16 @@ static int32_t lzwcompress(const char *lzwinbuf, int32_t uncompleng, char *lzwou
// Failed compressing, mark this in the stream.
shortptr[1] = 0;
for (i=0; i<uncompleng; i++)
for (i=0; i<uncompleng-4; i+=4)
{
lzwoutbuf[i+4] = lzwinbuf[i];
lzwoutbuf[i+5] = lzwinbuf[i+1];
lzwoutbuf[i+6] = lzwinbuf[i+2];
lzwoutbuf[i+7] = lzwinbuf[i+3];
}
for (; i<uncompleng; i++)
lzwoutbuf[i+4] = lzwinbuf[i];
return uncompleng+4;
@ -1675,12 +1730,18 @@ static int32_t lzwuncompress(const char *lzwinbuf, int32_t compleng, char *lzwou
return uncompleng;
}
for (i=255; i>=0; i--)
for (i=255; i>=4; i-=4)
{
lzwbuf2[i] = i;
lzwbuf3[i] = i;
lzwbuf2[i] = lzwbuf3[i] = i;
lzwbuf2[i-1] = lzwbuf3[i-1] = i-1;
lzwbuf2[i-2] = lzwbuf3[i-2] = i-2;
lzwbuf2[i-3] = lzwbuf3[i-3] = i-3;
}
lzwbuf2[i] = lzwbuf3[i] = i;
lzwbuf2[i-1] = lzwbuf3[i-1] = i-1;
lzwbuf2[i-2] = lzwbuf3[i-2] = i-2;
currstr = 256; bitcnt = (4<<3); outbytecnt = 0;
numbits = 8; oneupnumbits = (1<<8);
do
@ -1700,7 +1761,16 @@ static int32_t lzwuncompress(const char *lzwinbuf, int32_t compleng, char *lzwou
lzwtmpbuf[leng] = lzwbuf2[dat];
lzwoutbuf[outbytecnt++] = dat;
for (i=leng-1; i>=0; i--)
for (i=leng-1; i>=4; i-=4, outbytecnt+=4)
{
lzwoutbuf[outbytecnt] = lzwtmpbuf[i];
lzwoutbuf[outbytecnt+1] = lzwtmpbuf[i-1];
lzwoutbuf[outbytecnt+2] = lzwtmpbuf[i-2];
lzwoutbuf[outbytecnt+3] = lzwtmpbuf[i-3];
}
for (; i>=0; i--)
lzwoutbuf[outbytecnt++] = lzwtmpbuf[i];
lzwbuf2[currstr-1] = dat; lzwbuf2[currstr] = dat;