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Subject: [Bug middle-end/55331] New: [4.6/4.7/4.8 Regression] ICE: SIGSEGV in substitute_and_fold with -O2 -fno-tree-fre
Date: Wed, 14 Nov 2012 21:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55331

             Bug #: 55331
           Summary: [4.6/4.7/4.8 Regression] ICE: SIGSEGV in
                    substitute_and_fold with -O2 -fno-tree-fre
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 28691
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28691
autoreduced testcase

Compiler output:
$ gcc -O2 -fno-tree-fre testcase-min7.ii -wrapper
valgrind,-q,--num-callers=40,--track-origins=yes -w
==4620== Invalid read of size 1
==4620==    at 0xCEBDBD: substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool) (gimple.h:1146)
==4620==    by 0xC857C2: execute_copy_prop() (tree-ssa-copy.c:772)
==4620==    by 0xADBB7A: execute_one_pass(opt_pass*) (passes.c:2339)
==4620==    by 0xADBF94: execute_pass_list(opt_pass*) (passes.c:2400)
==4620==    by 0xADBFA6: execute_pass_list(opt_pass*) (passes.c:2401)
==4620==    by 0xADBFA6: execute_pass_list(opt_pass*) (passes.c:2401)
==4620==    by 0x85E4F1: expand_function(cgraph_node*) (cgraphunit.c:1643)
==4620==    by 0x8602A6: compile() (cgraphunit.c:1747)
==4620==    by 0x860949: finalize_compilation_unit() (cgraphunit.c:2122)
==4620==    by 0x67717E: cp_write_global_declarations() (decl2.c:4287)
==4620==    by 0xBC527C: compile_file() (toplev.c:559)
==4620==    by 0xBC7139: toplev_main(int, char**) (toplev.c:1881)
==4620==    by 0x5A364BC: (below main) (in /lib64/libc-2.15.so)
==4620==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==4620== 
testcase-min7.ii: In function 'void test01()':
testcase-min7.ii:253:1: internal compiler error: Segmentation fault
 test01 ()
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Tested revisions:
r193495 - crash
4.7 r191640 - crash
4.6 r191640 - crash
4.5 r191640 - OK