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[Bug middle-end/36753] [4.3/4.4 Regression] Forward propagation interacts badly with global register variable
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 11 Jul 2008 11:58:36 -0000
- Subject: [Bug middle-end/36753] [4.3/4.4 Regression] Forward propagation interacts badly with global register variable
- References: <bug-36753-14988@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from bonzini at gnu dot org 2008-07-11 11:58 -------
> Wonder why nothing in fwprop.c checks modified_between_p
There is code similar to modified_between_p in fwprop.c, that uses def info
from the dataflow pass. Part of the fwprop work was to try using the df-scan.c
info more than the recursive walks provided by rtlanal.c.
That said, the bug should be trivial to fix. I'll try (but not today
unfortunately).
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36753