[Bug rtl-optimization/59535] [4.9 regression] -Os code size regressions for Thumb1/Thumb2 with LRA

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59535

--- Comment #15 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Another testcase where the thumb1 code is poor is
gcc.c-torture/execute/pr28982b.c

With LRA we often get sequences such as:

        mov     r3, sp
        ldr     r2, .L8+16
        add     r3, r3, r2         // r2 dead.
        str     r0, [r3]

Instead of:

        ldr     r2, .L8+16
        add     r2, r2, sp
        str     r0, [r2]

Which is both shorter and needs fewer registers.