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From: "vmakarov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/70164] [8/9/10 Regression] Code/performance
 regression due to poor register allocation on Cortex-M0
Date: Tue, 21 Apr 2020 15:20:18 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
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X-Bugzilla-Keywords: missed-optimization, ra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D70164

--- Comment #25 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
Sorry, I can not reproduce this.  With today trunk I have for pr45701-1.c (=
-Os
-mthumb):

history_expand_line_internal:
        @ args =3D 0, pretend =3D 0, frame =3D 0
        @ frame_needed =3D 0, uses_anonymous_args =3D 0
        push    {r3, r4, r5, r6, r7, lr}
        mov     r4, r0
        ldr     r5, .L3
        ldr     r3, .L3+4
        ldr     r7, [r5]
        ldr     r6, [r3]
        movs    r3, #0
        str     r3, [r5]
        bl      pre_process_line
        cmp     r4, r0
        add     r6, r6, r7
        str     r6, [r5]
        bne     .L1
        bl      str_len
        adds    r0, r0, #1
        bl      x_malloc
        mov     r1, r4
        pop     {r3, r4, r5, r6, r7, lr}
        b       str_cpy
.L1:
        pop     {r3, r4, r5, r6, r7, pc}=