diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2012-09-06 07:29:12 +0000 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2012-09-06 07:29:12 +0000 |
| commit | e5a108a4bc878abbe15427cb570bbc4189c48b37 (patch) | |
| tree | f8d040452ec5242138c3043b9a7cc3be15f871d4 /gcc/sel-sched-ir.c | |
| parent | 61d50e330007c71cac09327c2f99ad77fdf46610 (diff) | |
PR rtl-optimization/54455
* sel-sched-ir.c (maybe_tidy_empty_bb): Give up if previous fallthru
bb ends up with asm goto referencing bb's label.
* gcc.dg/54455.c: New test.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@191013 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/sel-sched-ir.c')
| -rw-r--r-- | gcc/sel-sched-ir.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gcc/sel-sched-ir.c b/gcc/sel-sched-ir.c index 449efc97cbc..1f1095ecfed 100644 --- a/gcc/sel-sched-ir.c +++ b/gcc/sel-sched-ir.c @@ -1,5 +1,5 @@ /* Instruction scheduling pass. Selective scheduler and pipeliner. - Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 + Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. This file is part of GCC. @@ -3686,6 +3686,22 @@ maybe_tidy_empty_bb (basic_block bb) FOR_EACH_EDGE (e, ei, bb->preds) if (e->flags & EDGE_COMPLEX) return false; + else if (e->flags & EDGE_FALLTHRU) + { + rtx note; + /* If prev bb ends with asm goto, see if any of the + ASM_OPERANDS_LABELs don't point to the fallthru + label. Do not attempt to redirect it in that case. */ + if (JUMP_P (BB_END (e->src)) + && (note = extract_asm_operands (PATTERN (BB_END (e->src))))) + { + int i, n = ASM_OPERANDS_LABEL_LENGTH (note); + + for (i = 0; i < n; ++i) + if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (bb)) + return false; + } + } free_data_sets (bb); |