------- Comment #2 from dorit at il dot ibm dot com 2007-02-18 21:50 -------
I was able to reproduce it. Here's a reduced testcase:
void dacP98FillRGBMap( unsigned char *pBuffer )
{
unsigned long dw, dw1;
unsigned long *pdw = (unsigned long *)(pBuffer);
for( dw = 256, dw1 = 0; dw; dw--, dw1 += 0x01010101 ) {
*pdw++ = dw1;
*pdw++ = dw1;
*pdw++ = dw1;
*pdw++ = dw1;
}
}
Looks like possibly some bad interaction between vectorization of induction and
vectorization of strided-access. Will investigate.
--
dorit at il dot ibm dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|ice for legal code with - |ice for legal code with -
|ftree-vectorize -O2 |ftree-vectorize -O2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30843
