[Bug target/63390] [SH] Hoist/schedule constant pool loads

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63390

--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #1)

> .L4:
>         mov.l   @r9,r4     <<<< constant load
>         shlr    r4
>         tst     r4,r4
>         bt      .L2
>         mov.l   .L12,r5
>         jsr     @r10
>         nop
>         dt      r8
>         bf      .L4
> .L10:
>         lds.l   @r15+,pr
>         mov.l   @r15+,r10
>         mov.l   @r15+,r9
>         rts
>         mov.l   @r15+,r8

I've marked the wrong load insn as constant load.  In this case hoisting it out
of the loop wouldn't make lots of sense, since it's loaded into the call
clobbered register r5.  Bad example.  But it would still be better to hoist the
load into the preceding basic block.