[LLVMbugs] [Bug 11142] Testcase: suboptimal code in memory transportation

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11142

Nick Lewycky <nicholas at mxc.ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #10 from Nick Lewycky <nicholas at mxc.ca> 2011-10-18 04:29:05 CDT ---
That's a completely different problem: your new testcase doesn't have
targetdata in it. If I add the targetdata line from your previous test:

  target datalayout =
"e-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-f80:32:32-v64:64:64-v128:128:128-a0:0:64"

and run it through opt -O2, we eliminate all but two memcpy's, both copying
directly from their globals @label369 and @label374.

We can't do better than that (eliminate the malloc+memcpy+free) because that
string is passed into @fwrite, and it's entirely possible that fwrite does
something like look at the address of the pointer it's given.

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