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[Bug tree-optimization/51580] New: [4.7 regression] segfault during loop vectorization at -O3
- From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 16 Dec 2011 15:01:17 +0000
- Subject: [Bug tree-optimization/51580] New: [4.7 regression] segfault during loop vectorization at -O3
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51580
Bug #: 51580
Summary: [4.7 regression] segfault during loop vectorization at
-O3
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: ebotcazou@gcc.gnu.org
Target: i[345]86-*-*
Created attachment 26110
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26110
Testcase to be gnatchop'ed
The problem was introduced yesterday. Compile loop_optimization1.ads at -O3
for an x86 target and you'll get:
Program received signal SIGSEGV, Segmentation fault.
flow_bb_inside_loop_p (loop=0xf7ca1bb8, bb=0x0)
at /home/eric/svn/gcc/gcc/cfgloop.c:776
776 source_loop = bb->loop_father;
(gdb) bt
#0 flow_bb_inside_loop_p (loop=0xf7ca1bb8, bb=0x0)
at /home/eric/svn/gcc/gcc/cfgloop.c:776
#1 0x08b5a922 in vect_stmt_relevant_p (stmt=stmt@entry=0xf7c9c0c0,
relevant=relevant@entry=0xffffcc4c, live_p=live_p@entry=0xffffcc47,
loop_vinfo=<error reading variable: Unhandled dwarf expression opcode
0xfa>) at /home/eric/svn/gcc/gcc/tree-vect-stmts.c:260
#2 0x08b605c9 in vect_mark_stmts_to_be_vectorized (loop_vinfo=0x9cdc988)
at /home/eric/svn/gcc/gcc/tree-vect-stmts.c:552
#3 0x08b7ad7d in vect_analyze_loop_2 (loop_vinfo=0x9cdc988)
at /home/eric/svn/gcc/gcc/tree-vect-loop.c:1521
#4 vect_analyze_loop (loop=0xf7ca1bb8)
at /home/eric/svn/gcc/gcc/tree-vect-loop.c:1667
#5 0x08b8cc08 in vectorize_loops ()
at /home/eric/svn/gcc/gcc/tree-vectorizer.c:203
The testcase can be added to the testsuite as
gnat.dg/specs/loop_optimization1.ads
gnat.dg/specs/loop_optimization1_pkg.ad[sb]