[Bug target/10946] New: sibcall optimization does not call directly to sibling

[pinskia@physics.uc.edu]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10946

           Summary: sibcall optimization does not call directly to sibling
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pinskia@physics.uc.edu
                CC: gcc-bugs@gcc.gnu.org
 GCC build triplet: powerpc-apple-darwin6.6
  GCC host triplet: powerpc-apple-darwin6.6
GCC target triplet: powerpc-apple-darwin6.6

compile with -O3 -static or -O3 -mdynamic-no-pic:
int f(int i);

int g(int i, int j)
{
        if(i)
                return f(i);
        else
                return j*2*j;
}

Asm:
_g:
        cmpwi cr0,r3,0
        bne- cr0,L5
        mullw r0,r4,r4
        slwi r3,r0,1
        blr
L5:
        b _f

The better way is to do this and not to have an extra branch:
_g:
        cmpwi cr0,r3,0
        bne- cr0,_f
        mullw r0,r4,r4
        slwi r3,r0,1
        blr



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