Re: Change the ordering of cdce pass
On Thu, Jun 14, 2012 at 6:38 PM, Easwaran Raman era...@google.com wrote: The conditional dead call elimination pass shrink wraps certain dead calls to math functions. It doesn't handle case like this: D.142420_139 = powD.549 (D.142421_138, D.142419_132); fooD.120935.barD.113815 = D.142420_139; # foo.bar is dead here. This code gets cleaned up by DCE and leaves only pow, which can then be shrink-wrapped by cdce. So it seems reasonable to do this reordering. Bootstraps on x86_64 on linux with no test regression. OK for trunk? - Easwaran -- 2012-06-14 Easwaran Raman era...@google.com * gcc/passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. This caused: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53710 It may expose a latent bug. -- H.J.
Re: Change the ordering of cdce pass
On Fri, Jun 15, 2012 at 3:40 AM, Easwaran Raman era...@google.com wrote: ChangeLog entry has a gcc/ prefix that shouldn't be there. Here is the revised entry: 2012-06-14 Easwaran Raman era...@google.com * passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. Ok. Thanks, Richard. On Thu, Jun 14, 2012 at 6:38 PM, Easwaran Raman era...@google.com wrote: The conditional dead call elimination pass shrink wraps certain dead calls to math functions. It doesn't handle case like this: D.142420_139 = powD.549 (D.142421_138, D.142419_132); fooD.120935.barD.113815 = D.142420_139; # foo.bar is dead here. This code gets cleaned up by DCE and leaves only pow, which can then be shrink-wrapped by cdce. So it seems reasonable to do this reordering. Bootstraps on x86_64 on linux with no test regression. OK for trunk? - Easwaran -- 2012-06-14 Easwaran Raman era...@google.com * gcc/passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. Index: gcc/passes.c === --- gcc/passes.c (revision 188535) +++ gcc/passes.c (working copy) @@ -1374,7 +1374,6 @@ init_optimization_passes (void) NEXT_PASS (pass_complete_unrolli); NEXT_PASS (pass_ccp); NEXT_PASS (pass_forwprop); - NEXT_PASS (pass_call_cdce); /* pass_build_alias is a dummy pass that ensures that we execute TODO_rebuild_alias at this point. Re-building alias information also rewrites no longer addressed @@ -1387,6 +1386,7 @@ init_optimization_passes (void) NEXT_PASS (pass_merge_phi); NEXT_PASS (pass_vrp); NEXT_PASS (pass_dce); + NEXT_PASS (pass_call_cdce); NEXT_PASS (pass_cselim); NEXT_PASS (pass_tree_ifcombine); NEXT_PASS (pass_phiopt);
Change the ordering of cdce pass
The conditional dead call elimination pass shrink wraps certain dead calls to math functions. It doesn't handle case like this: D.142420_139 = powD.549 (D.142421_138, D.142419_132); fooD.120935.barD.113815 = D.142420_139; # foo.bar is dead here. This code gets cleaned up by DCE and leaves only pow, which can then be shrink-wrapped by cdce. So it seems reasonable to do this reordering. Bootstraps on x86_64 on linux with no test regression. OK for trunk? - Easwaran -- 2012-06-14 Easwaran Raman era...@google.com * gcc/passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. Index: gcc/passes.c === --- gcc/passes.c(revision 188535) +++ gcc/passes.c(working copy) @@ -1374,7 +1374,6 @@ init_optimization_passes (void) NEXT_PASS (pass_complete_unrolli); NEXT_PASS (pass_ccp); NEXT_PASS (pass_forwprop); - NEXT_PASS (pass_call_cdce); /* pass_build_alias is a dummy pass that ensures that we execute TODO_rebuild_alias at this point. Re-building alias information also rewrites no longer addressed @@ -1387,6 +1386,7 @@ init_optimization_passes (void) NEXT_PASS (pass_merge_phi); NEXT_PASS (pass_vrp); NEXT_PASS (pass_dce); + NEXT_PASS (pass_call_cdce); NEXT_PASS (pass_cselim); NEXT_PASS (pass_tree_ifcombine); NEXT_PASS (pass_phiopt);
Re: Change the ordering of cdce pass
ChangeLog entry has a gcc/ prefix that shouldn't be there. Here is the revised entry: 2012-06-14 Easwaran Raman era...@google.com * passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. On Thu, Jun 14, 2012 at 6:38 PM, Easwaran Raman era...@google.com wrote: The conditional dead call elimination pass shrink wraps certain dead calls to math functions. It doesn't handle case like this: D.142420_139 = powD.549 (D.142421_138, D.142419_132); fooD.120935.barD.113815 = D.142420_139; # foo.bar is dead here. This code gets cleaned up by DCE and leaves only pow, which can then be shrink-wrapped by cdce. So it seems reasonable to do this reordering. Bootstraps on x86_64 on linux with no test regression. OK for trunk? - Easwaran -- 2012-06-14 Easwaran Raman era...@google.com * gcc/passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. Index: gcc/passes.c === --- gcc/passes.c (revision 188535) +++ gcc/passes.c (working copy) @@ -1374,7 +1374,6 @@ init_optimization_passes (void) NEXT_PASS (pass_complete_unrolli); NEXT_PASS (pass_ccp); NEXT_PASS (pass_forwprop); - NEXT_PASS (pass_call_cdce); /* pass_build_alias is a dummy pass that ensures that we execute TODO_rebuild_alias at this point. Re-building alias information also rewrites no longer addressed @@ -1387,6 +1386,7 @@ init_optimization_passes (void) NEXT_PASS (pass_merge_phi); NEXT_PASS (pass_vrp); NEXT_PASS (pass_dce); + NEXT_PASS (pass_call_cdce); NEXT_PASS (pass_cselim); NEXT_PASS (pass_tree_ifcombine); NEXT_PASS (pass_phiopt);
Re: Change the ordering of cdce pass
It looks reasonable to move it after DCE which exposes more opportunities. David On Thu, Jun 14, 2012 at 6:38 PM, Easwaran Raman era...@google.com wrote: The conditional dead call elimination pass shrink wraps certain dead calls to math functions. It doesn't handle case like this: D.142420_139 = powD.549 (D.142421_138, D.142419_132); fooD.120935.barD.113815 = D.142420_139; # foo.bar is dead here. This code gets cleaned up by DCE and leaves only pow, which can then be shrink-wrapped by cdce. So it seems reasonable to do this reordering. Bootstraps on x86_64 on linux with no test regression. OK for trunk? - Easwaran -- 2012-06-14 Easwaran Raman era...@google.com * gcc/passes.c (init_optimization_passes): Remove pass_call_cdce from its current position and insert after pass_dce. Index: gcc/passes.c === --- gcc/passes.c (revision 188535) +++ gcc/passes.c (working copy) @@ -1374,7 +1374,6 @@ init_optimization_passes (void) NEXT_PASS (pass_complete_unrolli); NEXT_PASS (pass_ccp); NEXT_PASS (pass_forwprop); - NEXT_PASS (pass_call_cdce); /* pass_build_alias is a dummy pass that ensures that we execute TODO_rebuild_alias at this point. Re-building alias information also rewrites no longer addressed @@ -1387,6 +1386,7 @@ init_optimization_passes (void) NEXT_PASS (pass_merge_phi); NEXT_PASS (pass_vrp); NEXT_PASS (pass_dce); + NEXT_PASS (pass_call_cdce); NEXT_PASS (pass_cselim); NEXT_PASS (pass_tree_ifcombine); NEXT_PASS (pass_phiopt);
