Does unrolling prevents doloop optimizations?

[Vladimir Yanovsky]

Hello,

In file loop_doloop.c function doloop_condition_get makes sure that
the condition is GE or NE
otherwise it prevents doloop optimizations. This caused a problem for
a loop which had NE condition without unrolling and EQ if unrolling
was run. Can I make doloop work after the unroller?

Thanks,
Vladimir

----------------------------------------------------------------------------------------
Without unrolling:
(insn 135 80 136 4 (set (reg:SI 204 [ LastIndex ])
        (plus:SI (reg:SI 204 [ LastIndex ])
            (const_int -1 [0xffffffffffffffff]))) 51 {addsi3} (nil)
    (nil))

(jump_insn 136 135 84 4 (set (pc)
        (if_then_else (ne:SI (reg:SI 204 [ LastIndex ])
                (const_int 0 [0x0]))
            (label_ref:SI 69)
            (pc))) 368 {*spu.md:3288} (insn_list:REG_DEP_TRUE 135 (nil))
    (expr_list:REG_BR_PROB (const_int 9000 [0x2328])
        (nil)))


After unrolling:
(insn 445 421 446 21 (set (reg:SI 213)
        (plus:SI (reg:SI 213)
            (const_int -1 [0xffffffffffffffff]))) 51 {addsi3} (nil)
    (nil))

(jump_insn 446 445 667 21 (set (pc)
        (if_then_else (eq:SI (reg:SI 213)
                (const_int 0 [0x0]))
            (label_ref:SI 465)
            (pc))) 368 {*spu.md:3288} (insn_list:REG_DEP_TRUE 445 (nil))
    (expr_list:REG_BR_PROB (const_int 1000 [0x3e8])
        (nil)))