[Bug tree-optimization/17343] [3.5 Regression] a dispatch table can be shortened for certain switch statements

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-09-07 08:54 -------
This is actually a regression from 3.4.0.
for PPC (for 3.4.0):
_foo:
        cmpwi cr7,r3,15
        beq- cr7,L4
        cmpwi cr7,r3,16
        beq- cr7,L5
        cmpwi cr7,r3,14
        bne- cr7,L2
        b _foo1
L4:
        b _foo2
L5:
        b _foo3
L2:
        b _foo0

For 3.5.0:
_foo:
        addi r0,r3,-10
        cmplwi cr7,r0,6
        bgt- cr7,L2
        lis r2,ha16(L6)
        slwi r0,r0,2
        la r2,lo16(L6)(r2)
        lwzx r9,r2,r0
        add r9,r9,r2
        mtctr r9
        bctr
        .align 2
L6:
        .long L2-L6
        .long L2-L6
        .long L2-L6
        .long L2-L6
        .long L3-L6
        .long L4-L6
        .long L5-L6
L2:
        b _foo0
L5:
        b _foo3
L3:
        b _foo1
L4:
        b _foo2

I think what is happening is that case 10-13 are being combined but not with default so we not getting 
the non-switch (ifs) table actional here.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|enhancement                 |normal
             Status|UNCONFIRMED                 |NEW
          Component|rtl-optimization            |tree-optimization
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-09-07 08:54:08
               date|                            |
            Summary|a dispatch table can be     |[3.5 Regression] a dispatch
                   |shortened for certain switch|table can be shortened for
                   |statements                  |certain switch statements
   Target Milestone|---                         |3.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17343