seen with trunk 20100107, not with the 4.4 branch. lowering optimization to -O0 lets the build succeed. $ gcc -c -O1 uvector.i uvector.c: In function 'swapb64': uvector.c:10935:1: internal compiler error: in generate_subtree_copies, at tree-sra.c:2003 Please submit a full bug report, with preprocessed source if appropriate.
Created attachment 19548 [details] preprocessed source
Reducing.
__extension__ typedef unsigned long long int uint64_t; typedef uint64_t ScmUInt64; void swapb64(ScmUInt64 *loc) { union { ScmUInt64 l; unsigned char c[4]; } dd; unsigned char t; dd.l = *loc; (t = dd.c[3], dd.c[3] = dd.c[4], dd.c[4] = t); } > ./cc1 -quiet uvector.3.i -O uvector.3.i: In function 'swapb64': uvector.3.i:12:1: internal compiler error: in generate_subtree_copies, at tree-sra.c:2003 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions.
This code is undefined because out of bounds access of the array. Also note the use of the union is not needed here really as char is a character type which means it can be used to access the ScmUInt64 without any aliasing issues.
I would say that the dd.c[4] access into an array that is four chars long has undefined behavior. It is also the reason why build_ref_for_offset cannot find a suitable array element for it, because there is none. Because we should not ICE anyway I guess I'll resort to pro-actively checking that we can create an access to the original piece of the aggregate when deciding what replacements to create. (That is a bit pity as the asserts nicely checked that the function worked in the cases when it really should.) Another option (as Andrew has just suggested on IRC) would be to turn such things into __builtin_trap(). That would teach them not to write code like this, <evil grin>.
Patch posted to the mailing list: http://gcc.gnu.org/ml/gcc-patches/2010-01/msg00562.html
Subject: Bug 42703 Author: jamborm Date: Wed Jan 13 15:37:37 2010 New Revision: 155863 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155863 Log: 2010-01-13 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42703 * tree-sra.c (analyze_access_subtree): Check that we can build a reference to the original data within the aggregate. * testsuite/gcc.c-torture/compile/pr42703.c: New test. Added: trunk/gcc/testsuite/gcc.c-torture/compile/pr42703.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-sra.c
Fixed.
Subject: Bug 42703 Author: hjl Date: Sun Feb 7 04:41:22 2010 New Revision: 156562 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156562 Log: Backport testcases from mainline to 4.4. 2010-02-06 H.J. Lu <hongjiu.lu@intel.com> Backport from mainline: 2010-02-05 Dodji Seketeli <dodji@redhat.com> PR c++/42915 * g++.dg/other/crash-9.C: New test. 2010-02-03 Jason Merrill <jason@redhat.com> PR c++/40138 * g++.dg/ext/builtin11.C: New. 2010-02-03 Richard Guenther <rguenther@suse.de> PR tree-optimization/42944 * gcc.dg/errno-1.c: New testcase. 2010-02-03 Richard Guenther <rguenther@suse.de> PR middle-end/42927 * gcc.c-torture/compile/pr42927.c: New testcase. 2010-01-29 Dodji Seketeli <dodji@redhat.com> PR c++/42758 PR c++/42634 PR c++/42336 PR c++/42797 PR c++/42880 * g++.dg/other/crash-5.C: New test. * g++.dg/other/crash-7.C: New test. * g++.dg/other/crash-8.C: New test. 2010-01-28 Uros Bizjak <ubizjak@gmail.com> PR target/42891 * gcc.target/i386/pr42891.c: New test. 2010-01-28 Richard Guenther <rguenther@suse.de> PR middle-end/42883 * g++.dg/torture/pr42883.C: New testcase. 2010-01-28 Michael Matz <matz@suse.de> * gcc.target/i386/pr42881.c: New test. 2010-01-28 Dodji Seketeli <dodji@redhat.com> PR c++/42713 PR c++/42820 * g++.dg/template/typedef27.C: New test case. * g++.dg/template/typedef28.C: New test case. 2010-01-27 Jakub Jelinek <jakub@redhat.com> PR middle-end/42874 * gcc.dg/vla-22.c: New test. 2010-01-26 Richard Guenther <rguenther@suse.de> PR tree-optimization/42250 * gcc.dg/pr42250.c: New testcase. 2010-01-25 Tobias Burnus <burnus@net-b.de> PR fortran/42858 * gfortran.dg/generic_21.f90: New test. 2010-01-21 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42585 * gcc.dg/tree-ssa/pr42585.c: New test. 2010-01-20 Alexandre Oliva <aoliva@redhat.com> PR debug/42715 * gcc.dg/pr42715.c: New. 2010-01-20 Richard Guenther <rguenther@suse.de> PR tree-optimization/42717 * gcc.c-torture/compile/pr42717.c: New testcase. 2010-01-19 Paul Thomas <pault@gcc.gnu.org> PR fortran/42783 * gfortran.dg/bounds_check_15.f90 : New test. 2010-01-18 Dodji Seketeli <dodji@redhat.com> PR c++/42766 * g++.dg/conversion/op6.C: New test. 2010-01-18 Richard Guenther <rguenther@suse.de> PR tree-optimization/42781 * gfortran.fortran-torture/compile/pr42781.f90: New testcase. 2010-01-17 Richard Guenther <rguenther@suse.de> PR middle-end/42248 * gcc.c-torture/execute/pr42248.c: New testcase. 2010-01-17 Janus Weil <janus@gcc.gnu.org> PR fortran/42677 * gfortran.dg/interface_assignment_5.f90: New test. 2010-01-15 Richard Guenther <rguenther@suse.de> PR middle-end/42739 * g++.dg/torture/pr42739.C: New testcase. 2010-01-14 Jerry DeLisle <jvdelisle@gcc.gnu.org> PR fortran/42684 * gfortran.dg/interface_31.f90: New test. 2010-01-14 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42706 * gcc.dg/ipa/pr42706.c: New testcase. 2010-01-14 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42714 * g++.dg/torture/pr42714.C: New test. 2010-01-14 Alexander Monakov <amonakov@ispras.ru> PR rtl-optimization/42388 * gcc.dg/pr42388.c: New. 2010-01-14 Alexander Monakov <amonakov@ispras.ru> PR rtl-optimization/42294 * gfortran.dg/pr42294.f: New. 2010-01-14 Ira Rosen <irar@il.ibm.com> PR tree-optimization/42709 * gcc.dg/vect/pr42709.c: New test. 2010-01-13 Richard Guenther <rguenther@suse.de> PR tree-optimization/42730 * gcc.c-torture/compile/pr42730.c: New testcase. 2010-01-13 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42704 * g++.dg/torture/pr42704.C: New test. 2010-01-13 Martin Jambor <mjambor@suse.cz> PR tree-optimization/42703 * gcc.c-torture/compile/pr42703.c: New test. 2010-01-13 Richard Guenther <rguenther@suse.de> PR tree-optimization/42705 * gcc.c-torture/compile/pr42705.c: New testcase. 2010-01-13 Richard Guenther <rguenther@suse.de> PR middle-end/42716 * gcc.c-torture/compile/pr42716.c: New testcase. 2010-01-12 Joseph Myers <joseph@codesourcery.com> PR c/42708 * gcc.c-torture/compile/pr42708-1.c: New test. 2010-01-09 Alexandre Oliva <aoliva@redhat.com> PR middle-end/42363 * gcc.dg/torture/pr42363.c: New. 2010-01-09 Alexandre Oliva <aoliva@redhat.com> PR debug/42604 PR debug/42395 * gcc.dg/vect/pr42604.c: New. * gcc.dg/vect/pr42395.c: New. 2010-01-09 Richard Guenther <rguenther@suse.de> PR middle-end/42512 * gcc.c-torture/execute/pr42512.c: New testcase. Added: branches/gcc-4_4-branch/gcc/testsuite/g++.dg/conversion/op6.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/conversion/op6.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/ext/builtin11.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/ext/builtin11.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/other/crash-5.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/other/crash-5.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/other/crash-7.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/other/crash-7.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/other/crash-8.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/other/crash-8.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/other/crash-9.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/other/crash-9.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/template/typedef27.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/template/typedef27.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/template/typedef28.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/template/typedef28.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/torture/pr42704.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/torture/pr42704.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/torture/pr42714.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/torture/pr42714.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/torture/pr42739.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/torture/pr42739.C branches/gcc-4_4-branch/gcc/testsuite/g++.dg/torture/pr42883.C - copied unchanged from r156561, trunk/gcc/testsuite/g++.dg/torture/pr42883.C branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42703.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42703.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42705.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42705.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42708-1.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42708-1.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42716.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42716.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42717.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42717.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42730.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42730.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/compile/pr42927.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/compile/pr42927.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/execute/pr42248.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/execute/pr42248.c branches/gcc-4_4-branch/gcc/testsuite/gcc.c-torture/execute/pr42512.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.c-torture/execute/pr42512.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/errno-1.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/errno-1.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/ipa/pr42706.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/ipa/pr42706.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/pr42250.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/pr42250.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/pr42388.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/pr42388.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/pr42715.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/pr42715.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/torture/pr42363.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/torture/pr42363.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/tree-ssa/pr42585.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/tree-ssa/pr42585.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/vect/pr42395.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/vect/pr42395.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/vect/pr42604.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/vect/pr42604.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/vect/pr42709.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/vect/pr42709.c branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/vla-22.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.dg/vla-22.c branches/gcc-4_4-branch/gcc/testsuite/gcc.target/i386/pr42881.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.target/i386/pr42881.c branches/gcc-4_4-branch/gcc/testsuite/gcc.target/i386/pr42891.c - copied unchanged from r156561, trunk/gcc/testsuite/gcc.target/i386/pr42891.c branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/bounds_check_15.f90 - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.dg/bounds_check_15.f90 branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/generic_21.f90 - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.dg/generic_21.f90 branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/interface_31.f90 - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.dg/interface_31.f90 branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/interface_assignment_5.f90 - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.dg/interface_assignment_5.f90 branches/gcc-4_4-branch/gcc/testsuite/gfortran.dg/pr42294.f - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.dg/pr42294.f branches/gcc-4_4-branch/gcc/testsuite/gfortran.fortran-torture/compile/pr42781.f90 - copied unchanged from r156561, trunk/gcc/testsuite/gfortran.fortran-torture/compile/pr42781.f90 Modified: branches/gcc-4_4-branch/gcc/testsuite/ChangeLog