[LLVMbugs] [Bug 1878] New: opt -std-compile-opts drops

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1878

           Summary: opt -std-compile-opts drops
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: ASSIGNED
          Severity: enhancement
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: gordonhenriksen at mac.com
        ReportedBy: gordonhenriksen at mac.com
                CC: llvmbugs at cs.uiuc.edu


Armin Rigo reports from the PyPy project:

> Here is what appears to be another bug of 'opt': the "gc" annotation is 
> sometimes lost, or so it seems.  With the following input (140k gzip):
> 
>  http://wyvern.cs.uni-duesseldorf.de/~arigo/new_entrypoint.ll.gz
> 
> and the following command:
> 
>  llvm-as < new_entrypoint.ll | opt -std-compile-opts > new_entrypoint.bc
> 
> then llvm-dis shows that in the .bc file, the function 
> @pypy_SemiSpaceGC_malloc_varsize_clear has lost its gc "gcrootsingle" 
> attribute.

I'll need to do some further investigation to reduce the input and discover
which pass is at fault.


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