------- Additional Comments From bonzini at gcc dot gnu dot org 2005-08-18
13:46 -------
Sorry.
outcnt aliases with outbuf, so the load of t2 cannot be removed. The GIMPLE
code that is now emitted is something like:
void
bi_windup(unsigned char *outbuf, unsigned char bi_buf)
{
int t1 = outcnt;
outbuf[t1] = bi_buf;
int t2 = outcnt;
if (t2 == 16384)
flush_outbuf();
int t3 = outcnt;
outbuf[t3] = bi_buf;
}
where t3 == t2 if flush_outbuf is not called. My code removes the load into t3
if flush_outbuf is not called.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23455
