[LLVMbugs] [Bug 3120] New: Small interpreter-like testcase where LLVM fails to shine

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3120

           Summary: Small interpreter-like testcase where LLVM fails to
                    shine
           Product: new-bugs
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: danchr at gmail.com
                CC: llvmbugs at cs.uiuc.edu, danchr at gmail.com


Created an attachment (id=2238)
 --> (http://llvm.org/bugs/attachment.cgi?id=2238)
Testcase.tar

Attached below is a small program testing various techniques for writing the
core loop of an interpreter, and a shell script to execute it.

Example output from running on RHEL 5.1 on a 2.66GHz Core 2 Duo:

GCC 4.2.1 (LLVM): O4
Switched interpreter           602
Threaded interpreter           417
Recursive interpreter          610
Closure-based interpreter      868
GCC 4.2.1 (LLVM): O3
Switched interpreter           603
Threaded interpreter           416
Recursive interpreter          609
Closure-based interpreter      867
GCC 4.1.2: O3
Switched interpreter           335
Threaded interpreter           172
Recursive interpreter          444
GCC 3.4.6: O3
Switched interpreter           330
Threaded interpreter           411
Recursive interpreter          439
GCC 4.2.1 (LLVM): O2
Switched interpreter           604
Threaded interpreter           416
Recursive interpreter          609
Closure-based interpreter      869
GCC 4.1.2: O2
Switched interpreter           336
Threaded interpreter           169
Recursive interpreter          454
GCC 3.4.6: O2
Switched interpreter           327
Threaded interpreter           259
Recursive interpreter          446
GCC 4.2.1 (LLVM): Os
Switched interpreter           275
Threaded interpreter           365
Recursive interpreter          619
Closure-based interpreter      879
GCC 4.1.2: Os
Switched interpreter           343
Threaded interpreter           412
Recursive interpreter          475
GCC 3.4.6: Os
Switched interpreter           328
Threaded interpreter           259
Recursive interpreter          445

The timings for, for instance, Pentium 4 Xeon and PowerPC G4 are also quite
odd. Also, blocks are slow ;)


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