[Bug target/49678] scan for mov fails in gcc.target/arm/pr42575.c

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49678

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
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                 CC|                            |ktkachov at gcc dot gnu.org

--- Comment #3 from ktkachov at gcc dot gnu.org ---
The problem here is indeed sched1.
For the targets where it's failing we generate:
        mul     r3, r0, r3
        strd    r4, [sp, #-8]!
        umull   r4, r5, r0, r2
        mla     r2, r2, r1, r3
        mov     r0, r4
        add     r5, r2, r5
        mov     r1, r5
        ldrd    r4, [sp]
        add     sp, sp, #8
        bx      lr

but when we compile with -fno-schedule-insns we get the optimal:
        mul     r3, r0, r3
        mla     r3, r2, r1, r3
        umull   r0, r1, r0, r2
        add     r1, r3, r1
        bx      lr