http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46924
Summary: [4.6 Regression] ICE: SIGSEGV in
rewrite_commutative_reductions_out_of_ssa_loop
(graphite-poly.h:450) with -fgraphite-identity
-ffast-math -fno-tree-loop-im
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: zso...@seznam.cz
CC: s...@gcc.gnu.org
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 22744
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22744
reduced testcase (from gcc.dg/graphite/id-14.c)
Compiler output:
$ gcc -O -fgraphite-identity -ffast-math -fno-tree-loop-im pr46924.c
==29600== Invalid read of size 8
==29600== at 0xFDCB06: rewrite_commutative_reductions_out_of_ssa_loop
(graphite-poly.h:450)
==29600== by 0xFE3F1E: build_poly_scop (graphite-sese-to-poly.c:3068)
==29600== by 0xFCB4F4: graphite_transform_loops (graphite.c:282)
==29600== by 0x9B20C6: graphite_transforms (tree-ssa-loop.c:296)
==29600== by 0x7EC65E: execute_one_pass (passes.c:1553)
==29600== by 0x7EC924: execute_pass_list (passes.c:1608)
==29600== by 0x7EC936: execute_pass_list (passes.c:1609)
==29600== by 0x7EC936: execute_pass_list (passes.c:1609)
==29600== by 0x7EC936: execute_pass_list (passes.c:1609)
==29600== by 0x92CEF5: tree_rest_of_compilation (tree-optimize.c:422)
==29600== by 0xAF2721: cgraph_expand_function (cgraphunit.c:1508)
==29600== by 0xAF4CF9: cgraph_optimize (cgraphunit.c:1567)
==29600== Address 0x8 is not stack'd, malloc'd or (recently) free'd
==29600==
pr46924.c: In function 'foo':
pr46924.c:7:7: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
GDB backtrace:
split_reduction_stmt (scop=0x17c36f0, loop=<value optimized out>)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2644
2644 poly_bb_p pbb = pbb_from_bb (bb);
(gdb) bt
#0 split_reduction_stmt (scop=0x17c36f0, loop=<value optimized out>)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2644
#1 translate_scalar_reduction_to_array (scop=0x17c36f0, loop=<value optimized
out>)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2984
#2 rewrite_commutative_reductions_out_of_ssa_close_phi (scop=0x17c36f0,
loop=<value optimized out>)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3024
#3 rewrite_commutative_reductions_out_of_ssa_loop (scop=0x17c36f0, loop=<value
optimized out>)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3051
#4 0x0000000000fe3f1f in rewrite_commutative_reductions_out_of_ssa
(scop=0x17c36f0)
at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3068
#5 build_poly_scop (scop=0x17c36f0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3155
#6 0x0000000000fcb4f5 in graphite_transform_loops () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite.c:282
#7 0x00000000009b20c7 in graphite_transforms () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/tree-ssa-loop.c:296
#8 0x00000000007ec65f in execute_one_pass (pass=0x16368a0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1553
#9 0x00000000007ec925 in execute_pass_list (pass=0x16368a0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1608
#10 0x00000000007ec937 in execute_pass_list (pass=0x1636900) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#11 0x00000000007ec937 in execute_pass_list (pass=0x1636ba0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#12 0x00000000007ec937 in execute_pass_list (pass=0x1635d60) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#13 0x000000000092cef6 in tree_rest_of_compilation (fndecl=0x7ffff5cc4f00)
at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/tree-optimize.c:422
#14 0x0000000000af2722 in cgraph_expand_function (node=0x7ffff5ce4000)
at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1508
#15 0x0000000000af4cfa in cgraph_expand_all_functions () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1567
#16 cgraph_optimize () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1827
#17 0x0000000000af527a in cgraph_finalize_compilation_unit ()
at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1031
#18 0x0000000000508cdc in c_write_global_declarations () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/c-decl.c:9845
#19 0x00000000008d6776 in compile_file (argc=16, argv=0x7fffffffda98)
at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:591
#20 do_compile (argc=16, argv=0x7fffffffda98) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:1874
#21 toplev_main (argc=16, argv=0x7fffffffda98) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:1937
#22 0x00007ffff6586bbd in __libc_start_main () from /lib/libc.so.6
#23 0x00000000004ef6b9 in _start ()
Tested revisions:
r167723 - crash
r167585 - crash
r165699 - OK
4.5 r166509 - OK
