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performance: committed wrong version of buf_set_buf optimization

oops...

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
tags/v0.5.0-rc1
Mathias K 11 years ago
committed by Øyvind Harboe
parent
commit
b21be6054a
1 changed files with 18 additions and 4 deletions
  1. +18
    -4
      src/helper/binarybuffer.c

+ 18
- 4
src/helper/binarybuffer.c View File

@@ -133,26 +133,40 @@ void* buf_set_buf(const void *_src, unsigned src_start,
{
const uint8_t *src = _src;
uint8_t *dst = _dst;
unsigned sb,db,sq,dq;
unsigned i,sb,db,sq,dq, lb,lq;

sb = src_start / 8;
db = dst_start / 8;
sq = src_start % 8;
dq = dst_start % 8;
lb = len / 8;
lq = len % 8;

for (unsigned i = 0; i < len; i++)
src += sb;
dst += db;

/* check if both buffers are on byte boundary and
* len is a multiple of 8bit so we can simple copy
* the buffer */
if ( (sq == 0) && (dq == 0) && (lq == 0) )
{
for (i = 0; i < lb; i++)
*dst++ = *src++;
return (uint8_t*)_dst;
}

/* fallback to slow bit copy */
for (i = 0; i < len; i++)
{
if (((*src >> (sq&7)) & 1) == 1)
*dst |= 1 << (dq&7);
else
*dst &= ~(1 << (dq&7));

if ( sq++ == 7 )
{
sq = 0;
src++;
}

if ( dq++ == 7 )
{
dq = 0;


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