On 4/25/07, Steve Ellcey <[EMAIL PROTECTED]> wrote:
Richard,Has anyone reported any problems with your tree-ssa-loop-im.c patch that fixes PR tree-optimization/29789? I have been looking at a failure with the SPECfp2000 173.applu test. I found that if I compile it with version r124041 of the GCC gfortran compiler it works but if I compile it with version r124042 it fails. The difference between the two is your checkin: 2007-04-22 Richard Guenther <[EMAIL PROTECTED]> PR tree-optimization/29789 * tree-ssa-loop-im.c (stmt_cost): Adjust cost of shifts. (rewrite_reciprocal): New helper split out from determine_invariantness_stmt. (rewrite_bittest): Likewise. (determine_invariantness_stmt): Rewrite (A >> B) & 1 to A & (1 << B) if (1 << B) is loop invariant but (A >> B) is not. To make things harder, the problem only seems to happen if I build bootstrap. If I build a non-bootstrap compiler then the applu test compiles and runs fine. If I build a bootstrap compiler, I can compile applu but the program core dumps when run. Do you have any ideas about what might be happening or what I might try in order to understand what is going wrong.
I'm investigating. Richard.
