[LLVMbugs] [Bug 1875] New: Found a case where llvm-g++ 2.1 (or TOT) produces worse code than 2.0

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1875

           Summary: Found a case where llvm-g++ 2.1 (or TOT) produces worse
                    code than 2.0
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: niklasso at gmail.com
                CC: llvmbugs at cs.uiuc.edu


The source in question is a version of the open-source SAT solver MiniSat
(http://minisat.se). I'm compiling it using "llvm-g++ --emit-llvm", and then
using llvm-ld to do IPO, and finally llc to produce an x86 binary. If I compile
with llvm-g++ based on version 2.0 I get better code than llvm-g++ based on 2.1
or current svn version (roughly 3-5% faster). If I use 2.0 or 2.1 versions of
llvm-ld and llc does not seem to matter much however.

See the README in the attached archive for instructions on how I built the
program and how to run the testcases. If you want to include this in your test
framework that is fine.


-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.