From f7882debb8223bd221deed9693c4ea07b7a36808 Mon Sep 17 00:00:00 2001 From: Michael Matz Date: Fri, 26 Nov 2010 16:51:39 +0000 Subject: [PATCH] tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops. * tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops. * passes.c (init_optimization_passes): Remove superfluous copy-prop pass. From-SVN: r167184 --- gcc/ChangeLog | 7 +++++++ gcc/passes.c | 1 - gcc/tree-ssa-copy.c | 4 +++- 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 810590c..7e996ca 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2010-11-26 Michael Matz + + * tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops. + + * passes.c (init_optimization_passes): Remove superfluous + copy-prop pass. + 2010-11-26 Richard Guenther PR lto/46648 diff --git a/gcc/passes.c b/gcc/passes.c index b5cb2ac..38cc570 100644 --- a/gcc/passes.c +++ b/gcc/passes.c @@ -897,7 +897,6 @@ init_optimization_passes (void) NEXT_PASS (pass_graphite); { struct opt_pass **p = &pass_graphite.pass.sub; - NEXT_PASS (pass_copy_prop); NEXT_PASS (pass_graphite_transforms); NEXT_PASS (pass_copy_prop); NEXT_PASS (pass_dce_loop); diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c index 6837033..d552c3a 100644 --- a/gcc/tree-ssa-copy.c +++ b/gcc/tree-ssa-copy.c @@ -775,7 +775,9 @@ fini_copy_prop (void) duplicate_ssa_name_ptr_info (copy_of[i].value, SSA_NAME_PTR_INFO (var)); } - substitute_and_fold (get_value, NULL, true); + /* Don't do DCE if we have loops. That's the simplest way to not + destroy the scev cache. */ + substitute_and_fold (get_value, NULL, !current_loops); free (copy_of); } -- 2.7.4