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| author | Richard Henderson <rth@redhat.com> | 2009-09-16 08:04:06 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2009-09-16 08:04:06 -0700 |
| commit | 798763075fa686158fc9b40b2e6b3bc57320dd5a (patch) | |
| tree | 00b526e6b0899f2c8935d2bf97966bacb064ecf9 /gcc/cfgbuild.c | |
| parent | 20faffe76f5c17d2f21a7946be0e19d0f4898b89 (diff) | |
| download | gcc-798763075fa686158fc9b40b2e6b3bc57320dd5a.zip gcc-798763075fa686158fc9b40b2e6b3bc57320dd5a.tar.gz gcc-798763075fa686158fc9b40b2e6b3bc57320dd5a.tar.bz2 | |
re PR middle-end/41360 (Revision 151696 breaks gcc.c-torture/compile/builtin_unreachable-1.c)
PR middle-end/41360
* cfgbuild.c (find_bb_boundaries): Re-instate 2009-09-02 barrier fix.
From-SVN: r151759
Diffstat (limited to 'gcc/cfgbuild.c')
| -rw-r--r-- | gcc/cfgbuild.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc/cfgbuild.c b/gcc/cfgbuild.c index b5ddadd..5744108 100644 --- a/gcc/cfgbuild.c +++ b/gcc/cfgbuild.c @@ -477,9 +477,17 @@ find_bb_boundaries (basic_block bb) if (code == CODE_LABEL && LABEL_ALT_ENTRY_P (insn)) make_edge (ENTRY_BLOCK_PTR, bb, 0); } - - if (control_flow_insn_p (insn)) + else if (code == BARRIER) + { + /* __builtin_unreachable () may cause a barrier to be emitted in + the middle of a BB. We need to split it in the same manner as + if the barrier were preceded by a control_flow_insn_p insn. */ + if (!flow_transfer_insn) + flow_transfer_insn = prev_nonnote_insn_bb (insn); + } + else if (control_flow_insn_p (insn)) flow_transfer_insn = insn; + if (insn == end) break; insn = NEXT_INSN (insn); |