In tree-ssa-math-opts.c we already had a pass to cse sin and cos. The new
reciprocal sqrt pass is mechanically similar to that one. It does a linear
scan over the CFG applying these peephole transformations. This new pass
should not be doing a separate IL scan to do its job.
Perhaps it would be a good idea to do a single scan that calls back to
all these transformations on every statement? I realize that each pass
requires its own setup and may need to do things a bit differently, but
perhaps we can save ourselves multiple IL scans if we generalize it a bit.
--
Summary: tree-ssa-math-opts.c performs too many IL scans
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dnovillo at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32390
