[Bug tree-optimization/22196] Missed back prop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22196 Andrew Pinski changed: What|Removed |Added CC||goon.pri.low at gmail dot com --- Comment #5 from Andrew Pinski --- *** Bug 112608 has been marked as a duplicate of this bug. ***
[Bug tree-optimization/22196] Missed back prop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22196 --- Comment #4 from Andrew Pinski --- (In reply to Andrew Pinski from comment #3) > This actually undos some of what phi-opt might do and only should be done > for a few operations. I think divide, multiple, shifts and rotates should > be done and only with a constant operand. This has to be done late very > close to expand even. > > I will be implementing this but might miss GCC 12 as I have a lot on my > plate already for GCC 12. It turns out this is still true. I had implemented the binary factoring out of operations for phiopt and end up with a failure with `gcc.dg/tree-prof/val-prof-1.c` which depends on phiopt not doing this. Note only one of the phi nodes needs to be constant for when we want to handle it. Oh I wonder if val-prof-1.c is still going to fail since we had originally: if (a == CST) b = CST/c; else b = a/c; And now we might have removed the if .. Woops. Anyways I will have to go and dig into that failure some more but this issue is now needed again too.
[Bug tree-optimization/22196] Missed back prop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22196 Andrew Pinski changed: What|Removed |Added Status|NEW |ASSIGNED --- Comment #3 from Andrew Pinski --- This actually undos some of what phi-opt might do and only should be done for a few operations. I think divide, multiple, shifts and rotates should be done and only with a constant operand. This has to be done late very close to expand even. I will be implementing this but might miss GCC 12 as I have a lot on my plate already for GCC 12.
[Bug tree-optimization/22196] Missed back prop
--- Comment #2 from pinskia at gcc dot gnu dot org 2007-02-09 16:10 --- *** Bug 30747 has been marked as a duplicate of this bug. *** -- pinskia at gcc dot gnu dot org changed: What|Removed |Added CC||ak at muc dot de http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22196
[Bug tree-optimization/22196] Missed back prop
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-02 17:32 --- Confirmed. -- What|Removed |Added Status|UNCONFIRMED |NEW Ever Confirmed||1 Last reconfirmed|-00-00 00:00:00 |2005-07-02 17:32:29 date|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22196