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Re: optimization/5422: powerpc -O2 -fssa -fdce misoptimization
- From: dje at gcc dot gnu dot org
- To: dje at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, haruki dot kodera at nifty dot com, nobody at gcc dot gnu dot org
- Date: 13 Mar 2002 22:26:38 -0000
- Subject: Re: optimization/5422: powerpc -O2 -fssa -fdce misoptimization
- Reply-to: dje at gcc dot gnu dot org, dje at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, haruki dot kodera at nifty dot com, nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
Synopsis: powerpc -O2 -fssa -fdce misoptimization
Responsible-Changed-From-To: unassigned->dje
Responsible-Changed-By: dje
Responsible-Changed-When: Wed Mar 13 14:26:38 2002
Responsible-Changed-Why:
powerpc
State-Changed-From-To: open->closed
State-Changed-By: dje
State-Changed-When: Wed Mar 13 14:26:38 2002
State-Changed-Why:
@item -fssa
@opindex fssa
Perform optimizations in static single assignment form. Each function's
flow graph is translated into SSA form, optimizations are performed, and
the flow graph is translated back from SSA form. Users should not
specify this option, since it is not yet ready for production use.
@item -fdce
@opindex fdce
Perform dead-code elimination in SSA form. Requires @option{-fssa}. Like
@option{-fssa}, this is an experimental feature.
The SSA optimizations are experimental and should not be
used. The options are known to produce incorrect results.
Until these options are supported for production use, bug
reports cannot be addressed. If you want to help with the
development of these types of optimizations, please contact
the developers directly.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5422