------- Additional Comments From rakdver at atrey dot karlin dot mff dot cuni dot cz 2005-03-29 20:47 ------- Subject: Re: [4.0/4.1 regression] ivopts produces code that generates "unaligned access exception"
> This most likely can be reproduced on ia64 too and other targets where > alignment is needed for some > loads. > > The tree which we produce looks like: > <bb 0>: > if (p->c[0] != 0) goto <L0>; else goto <L2>; > > <L0>:; > D.1133 = *((unsigned char *) p + 5B); > p = p + 1B; > if (D.1133 != 0) goto <L0>; else goto <L2>; The problem seems to be that the expansion assumes that p must be aligned. Which seems to be reasonable. I will try making ivopts produce all pointer ivs in (void *) type, that should hopefully help. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20625
