[LLVMbugs] [Bug 8194] New: Assertion on optimisation

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Sep 21 02:54:20 PDT 2010


           Summary: Assertion on optimisation
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: chris at bubblescope.net
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com

Created an attachment (id=5511)
 --> (http://llvm.org/bugs/attachment.cgi?id=5511)
Asserting testcase

The following code is reduced from an example for boost::date_time. It compiles
fine with 'clang++ t.cc -c', but fails with 'clang++ t.cc -O' (or higher
optimisation level).

I believe this a boundary case somewhere, as the constant 9223372036854775807 (
= 2^63 - 1) appears, and changing this by one value up or down makes the code
compiler correctly. Apologies for the size of the testcase.

I strongly believe this test has worked at some point in the past, but I am not
sure exactly when.

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