http://llvm.org/bugs/show_bug.cgi?id=7260
Summary: Bogus(?) floating-point overflow
Product: libraries
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=4949)
--> (http://llvm.org/bugs/attachment.cgi?id=4949)
self-contained source code body to reproduce the problem.
LLVM revision 105128
CLANG revision 105014
MacOS 10.6.3
XCode 3.2.2
MacPro 1st generation
I attached a self-contained source code to reproduce the problem:
(1) make
(2) ./tst_eigen: that should result in a floating-point exception
(3) ./tst_eigen mask_overflow: the program should enter an infinite loop
That shows that a floating-point overflow happens, and it can only be in the
function real_symmetric_eigen.
The program runs normally if CXXFLAGS does not feature -O3.
It also runs fine if g++ is used, even with -O3.
The body of that function real_symmetric_eigen is truly a black-box which I
have not studied. My motivation to report it is that this is a blocker to
enable clang as a compiler for the project this code comes from, the
Computational Crystallographic Toolbox (CCTBX).
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