Red Hat Bugzilla – Bug 462015
g++ ICE in convert_move when compiling eigen2 testsuite on i386
Last modified: 2009-07-14 10:11:38 EDT
Description of problem:
As discovered during the review of eigen2 (bug 459705), its testsuite crashes Fedora 9's g++ on 32-bit x86. A build in a 64-bit mock on the same 64-bit OS succeeds.
Version-Release number of selected component (if applicable):
gcc-c++-4.3.0-8.x86_64 with -m32
Steps to Reproduce:
I originally used mock -r fedora-9-i386 eigen2-2.0-0.2.alpha7.fc10.src.rpm, but here's a better way to reproduce it:
1. download attached eigen-testcase.i.bz2 (this is just the preprocessed version of inverse.cpp from eigen2 with the line numbers removed, the source code according to the GPL can be found in bug 459705 and soon in Fedora's eigen2 package)
2. bunzip2 eigen-testcase.i.bz2
3. g++ -m32 -O2 -S -fpreprocessed eigen2-testcase.i
Unfortunately, the testcase isn't really minimal because I got lost in the labyrinth of templates, so there are probably a lot more definitions than needed. I did minimize the last section (starting from void f(); in the testcase). IIRC there are some automated testcase minimizers floating around on the GCC list, it's probably worth trying to run one of these.
eigen2-testcase.i: In constructor ‘Eigen::LU<MatrixType>::LU(const MatrixType&) [with MatrixType = Eigen::Matrix<std::complex<double>, 10000, 10000, 10000, 10000, 49u>]’:
eigen2-testcase.i:29531: internal compiler error: in convert_move, at expr.c:371
The file compiles.
I do have some experience debugging GCC bugs (from my TIGCC work), in particular I understand GCC tree and RTL dumps, so I'll try to help as much as possible and needed, but for now I wanted to get this reported. If I find out anything further, I'll keep you updated.
Created attachment 316490 [details]
Testcase from eigen2 which crashes g++
Looks like Bugzilla didn't actually record my attachment, so here it is.
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