[LLVMbugs] [Bug 3534] New: Add paq8p to llvm testsuite

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Feb 10 02:53:06 PST 2009


           Summary: Add paq8p to llvm testsuite
           Product: Test Suite
           Version: trunk
          Platform: PC
               URL: http://www.cs.fit.edu/~mmahoney/compression/paq8p.zip
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Programs Tests
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=2518)
 --> (http://llvm.org/bugs/attachment.cgi?id=2518)

This file shows interesting runtimes with different optimizations on  a 256k
file generated from /dev/urandom.

(Built with g++ -march=native -DNOASM)

On x86-64:

g++-4.3 -O3: 55.75 s
g++-4.3 -O2: 39.25 s
g++-4.3 -Os: 41.14 s

llvm-g++ -O3: 53.23 s
llvm-g++ -O2: 53.37 s
llvm-g++ -Os: 55.86 s

So llvm's -O3 is slightly better than gcc's, however it can't achieve gcc's
-O2/-Os. I think this may have something to do with inlining.

Example run:
llvm-g++ -O2 -DNOASM paq8p.cpp;
./a.out file

It prints execution time.

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