[LLVMbugs] [Bug 9416] New: [Boost regression] Miscompile with private constant array

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sun Mar 6 14:14:25 PST 2011


           Summary: [Boost regression] Miscompile with private constant
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: dgregor at apple.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=6283)
 --> (http://llvm.org/bugs/attachment.cgi?id=6283)
Example C++ source

With the given example file (t.cpp), the std::copy instantiation appears to be
miscompiled when built with Clang for x86-64. The LLVM IR looks reasonable, in
the resulting assembly the std::copy caller pushes the [first, last) arguments
into [%rdi, %rsi) but the callee seems to pick them up as [%rsi, %di). At
least, the subtraction looks backwards (?). The net effect is that the loop
inside std::copy is never executed. 

(More attachments and comments coming)

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