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| author | Richard Biener <rguenther@suse.de> | 2019-08-26 09:29:07 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2019-08-26 09:29:07 +0000 |
| commit | bf05a3bbb58b355899ccabe861a06e85b7abe6e4 (patch) | |
| tree | d27ee2541e74e6193894d4818d2a4c19b898e43c | |
| parent | 20e7012b755427d1db00ba6f236583ff3c24e710 (diff) | |
| download | gcc-bf05a3bbb58b355899ccabe861a06e85b7abe6e4.zip gcc-bf05a3bbb58b355899ccabe861a06e85b7abe6e4.tar.gz gcc-bf05a3bbb58b355899ccabe861a06e85b7abe6e4.tar.bz2 | |
re PR c/91526 (Unnecessary SSE and other instructions generated when compiling in C mode (vs. C++ mode))
2019-08-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/91526
* passes.def: Note that after late FRE we do TODO_update_address_taken.
* tree-ssa-sccvn.c (pass_fre::execute): In late mode schedule
TODO_update_address_taken.
From-SVN: r274922
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/passes.def | 2 | ||||
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 5 |
3 files changed, 14 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f751920..705c993 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2019-08-26 Richard Biener <rguenther@suse.de> + + PR tree-optimization/91526 + * passes.def: Note that after late FRE we do TODO_update_address_taken. + * tree-ssa-sccvn.c (pass_fre::execute): In late mode schedule + TODO_update_address_taken. + 2019-08-26 Gerald Pfeifer <gerald@pfeifer.com> * config/i386/gmm_malloc.h: Only use <errno.h> and errno if diff --git a/gcc/passes.def b/gcc/passes.def index 1a7fd14..fe5a411 100644 --- a/gcc/passes.def +++ b/gcc/passes.def @@ -313,6 +313,8 @@ along with GCC; see the file COPYING3. If not see NEXT_PASS (pass_split_paths); NEXT_PASS (pass_tracer); NEXT_PASS (pass_fre, false /* may_iterate */); + /* After late FRE we rewrite no longer addressed locals into SSA + form if possible. */ NEXT_PASS (pass_thread_jumps); NEXT_PASS (pass_dominator, false /* may_peel_loop_headers_p */); NEXT_PASS (pass_strlen); diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index 76cad43..336a7c7 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -7312,6 +7312,11 @@ pass_fre::execute (function *fun) if (iterate_p) loop_optimizer_finalize (); + /* For late FRE after IVOPTs and unrolling, see if we can + remove some TREE_ADDRESSABLE and rewrite stuff into SSA. */ + if (!may_iterate) + todo |= TODO_update_address_taken; + return todo; } |