[LLVMbugs] [Bug 2717] New: significant code bloat vs. gcc at -Os

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2717

           Summary: significant code bloat vs. gcc at -Os
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1958)
 --> (http://llvm.org/bugs/attachment.cgi?id=1958)
code for this PR

Seen using r55218 on Ubuntu Hardy on ia32.

Here's an example where llvm should probably be producing smaller code.  Its
output is 700% larger than gcc's.

regehr at john-home:~/volatile/tmp11$ llvm-gcc -Os -w small.c -o small ; size
small
   text    data     bss     dec     hex filename
   6324     252       8    6584    19b8 small
regehr at john-home:~/volatile/tmp11$ current-gcc -Os -w small.c -o small ; size
small
   text    data     bss     dec     hex filename
    784     252      12    1048     418 small

Looks easy to fix: at -Os the inliner should not be so aggressive.


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