[Bug tree-optimization/23855] Should not do loop header copying for inner loop

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-13 
14:01 -------
On PPC, we get optimal and almost unswitched loop:
L4:
        ble- cr4,L7
        li r31,0
L6:
        addi r31,r31,1
        bl _bar
        cmpw cr7,r30,r31
        bne+ cr7,L6
L7:
        addi r29,r29,1
        cmpw cr7,r28,r29
        bne+ cr7,L4


cr4 is a callee save register.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23855