diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-05-11 18:17:43 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-05-11 18:17:43 +0000 |
| commit | dcb172b4aee2541920b5793aa338e40824f521b4 (patch) | |
| tree | 1cb4796f120b34f94f9e016946901fdcba7136f8 /gcc/cfglayout.c | |
| parent | 6834c43a3100068ce10f4b1b60c5bbb486e2a353 (diff) | |
| download | gcc-dcb172b4aee2541920b5793aa338e40824f521b4.tar.gz | |
PR middle-end/44071
* cfglayout.c (fixup_reorder_chain): Allow asm goto to have
no fallthru edge.
* cfgcleanup.c (try_optimize_cfg): When in cfglayout mode
optimizing away empty bb with no successors, move over its
footer chain to fallthru predecessor.
* cfgrtl.c (patch_jump_insn): Update also REG_LABEL_OPERAND.
(rtl_split_edge): For asm goto call patch_jump_insn even if
splitting fallthru edge.
* c-c++-common/asmgoto-4.c: New test.
* gcc.target/i386/pr44071.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159288 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cfglayout.c')
| -rw-r--r-- | gcc/cfglayout.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/cfglayout.c b/gcc/cfglayout.c index 9d23b16c116..7ba289f1a58 100644 --- a/gcc/cfglayout.c +++ b/gcc/cfglayout.c @@ -1,5 +1,5 @@ /* Basic block reordering routines for the GNU compiler. - Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009 + Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GCC. @@ -861,8 +861,11 @@ fixup_reorder_chain (void) } else if (extract_asm_operands (PATTERN (bb_end_insn)) != NULL) { - /* If the old fallthru is still next, nothing to do. */ - if (bb->aux == e_fall->dest + /* If the old fallthru is still next or if + asm goto doesn't have a fallthru (e.g. when followed by + __builtin_unreachable ()), nothing to do. */ + if (! e_fall + || bb->aux == e_fall->dest || e_fall->dest == EXIT_BLOCK_PTR) continue; |