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| author | Jeff Law <law@redhat.com> | 2016-01-19 16:03:26 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2016-01-19 16:03:26 -0700 |
| commit | 89d0fecd2d6eb461311231c826a628a0a388516e (patch) | |
| tree | b5448037ec621e4f96bf37b062c57226e8ae4438 /gcc | |
| parent | 4a8c29cc7af55c3278bea0912e52b8739d274480 (diff) | |
| download | gcc-89d0fecd2d6eb461311231c826a628a0a388516e.zip gcc-89d0fecd2d6eb461311231c826a628a0a388516e.tar.gz gcc-89d0fecd2d6eb461311231c826a628a0a388516e.tar.bz2 | |
re PR tree-optimization/69347 (excessive compile time with -O2)
PR middle-end/69347
* tree-ssa-threadbackwards.c
(fsm_find_control_statement_thread_paths): Do not try to lookup
FSM paths for SSA_NAMEs appearing in abnormal PHIs.
From-SVN: r232593
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/tree-ssa-threadbackward.c | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f41b2c6..2930a8f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2016-01-19 Jeff Law <law@redhat.com> + + PR middle-end/69347 + * tree-ssa-threadbackwards.c + (fsm_find_control_statement_thread_paths): Do not try to lookup + FSM paths for SSA_NAMEs appearing in abnormal PHIs. + 2016-01-20 Kugan Vivekanandarajah <kuganv@linaro.org> * doc/lto.texi: Remove text that says only Gold has linker plugin diff --git a/gcc/tree-ssa-threadbackward.c b/gcc/tree-ssa-threadbackward.c index 8c99f6f..8d8aa30 100644 --- a/gcc/tree-ssa-threadbackward.c +++ b/gcc/tree-ssa-threadbackward.c @@ -99,6 +99,11 @@ fsm_find_control_statement_thread_paths (tree name, vec<basic_block, va_gc> *&path, bool seen_loop_phi) { + /* If NAME appears in an abnormal PHI, then don't try to trace its + value back through PHI nodes. */ + if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name)) + return; + gimple *def_stmt = SSA_NAME_DEF_STMT (name); basic_block var_bb = gimple_bb (def_stmt); |