[Bug target/40105] SH: 4.3/4.4 compilers segfault when recompiling itself on gentoo system

[kkojima at gcc dot gnu dot org]

------- Comment #4 from kkojima at gcc dot gnu dot org  2009-05-13 14:07 -------
Created an attachment (id=17857)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17857&action=view)
a test case

I've got a small test case from libiberty/concat.c.
With -O1, 4.3 compiles vconcat_length to the codes below:

        ...
.L5:
        jsr     @r12            ! Call strlen
        nop
        add     r0,r9
        mov.l   @r8,r4
        mov     r4,r2
        add     #4,r2
        mov.l   @(4,r8),r1
        cmp/hs  r2,r1
        bt/s    .L4
        mov     r8,r2
        mov.l   @(16,r8),r4
        mov     r13,r2
.L4:
        mov     r4,r1
        add     #4,r1
        mov.l   r1,@r2
        mov.l   @r4,r4
        tst     r4,r4
        bf/s    .L5
        mov     r9,r4           !!!
        mov.l   .L17,r0
        jsr     @r0             ! Call malloc.
        ...

i.e. the delayed branch optimization fills a delay slot
with an inappropriate instruction at the line !!!.
I've confirmed that the 4.4 compiler's output is similar
and the outputs for 4.2 and 4.5 look correct even with -O.
I have no idea for what is going on ATM, though.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40105