[Bug target/69403] Wrong thumb2_ior_scc_strict_it insn pattern.

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69403

--- Comment #2 from ktkachov at gcc dot gnu.org ---
I agree that the pattern is buggy but I can't get the bad codegen to trigger on
any of 4.9, 5 or trunk. I get a branch over lines 26 and 27:
bug:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 0, uses_anonymous_args = 0
        cmp     r0, r2
        push    {r3, r4, r5, r6, r7, lr}
        bcc     .L9
        mvn     r0, #-2147483648
        pop     {r3, r4, r5, r6, r7, pc}
.L9:
        mov     r7, r2
        mov     r5, r1
        mov     r4, r0
        bl      FT_MSB
        rsb     r2, r0, #31
        adds    r6, r0, #1
        lsl     r3, r4, r2
        lsr     r1, r5, r6
        orrs    r3, r3, r1
        lsl     r1, r5, r2
        udiv    r0, r3, r7
        mls     r3, r7, r0, r3
.L4:
        lsrs    r2, r1, #31
        lsls    r0, r0, #1
        orr     r3, r2, r3, lsl #1
        lsls    r1, r1, #1
        cmp     r7, r3
        bhi     .L3
        subs    r3, r3, r7
        orr     r0, r0, #1
.L3:
        subs    r6, r6, #1
        bne     .L4
        pop     {r3, r4, r5, r6, r7, pc}


I'll fix the *thumb2_ior_scc_strict_it.
I believe the first alternative should just be deleted and operand 0 be made an
earlyclobber, but an executable testcase triggering this problem would be
useful for the testsuite. Are there any implicit tuning options that are used?
i.e. some particular --with-tune or --with-cpu configure option?