[LLVMbugs] [Bug 3549] New: extremelly slow -O2 compilation

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3549

           Summary: extremelly slow -O2 compilation
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rdivacky at freebsd.org
                CC: llvmbugs at cs.uiuc.edu


when compiling the attached test case I am getting these times:

lev /tmp$ time ccc -c parse.c
1.933u 0.081s 0:02.04 98.5%     22993+3509k 0+19io 0pf+0w

lev /tmp$ time ccc -c -g parse.c
2.647u 0.122s 0:02.85 96.8%     22070+3357k 0+30io 0pf+0w

ie. 2-3 seconds for plain build but

lev /tmp$ time ccc -c -O2 parse.c
467.364u 0.611s 8:07.90 95.9%   23927+3528k 0+20io 0pf+0w

thats over 8 minutes!

I dont know if the problem is in clang or llvm but top shows clang binary
running. this is with r64302, during the compilation the clang process took
~100MB

this is on amd64/freebsd


-- 
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.