[Bug target/55212] [SH] Switch to LRA

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55212

--- Comment #66 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
Created attachment 33707
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33707&action=edit
a possible patch

With it, foo is compiled to

foo:
        sts.l   pr,@-r15
        mov.w   .L4,r1
        mov     r4,r5
        mov.l   .L3,r0
        mov     #16,r4
        sub     r1,r15
        jsr     @r0
        add     r15,r4
        mov.l   @(16,r15),r0
        mov.w   .L4,r7
        add     r7, r15
        lds.l   @r15+,pr
        rts
        nop
        .align 1
.L4:
        .short  400

and the code size regression for CSiBE is reduced to 0.74%.