[Bug middle-end/42722] move_by_pieces() incorrectly pushes structures to stack

[mikpe at it dot uu dot se]

------- Comment #10 from mikpe at it dot uu dot se  2010-02-09 08:58 -------
(In reply to comment #9)
> Finally, the m32c port defines both PUSH_ARGS and HAVE_POST_INCREMENT, so it
> can be possible to reproduce the bug on this port.

> cat pr42722.c
struct test {
    int a, b, c, d;
};
void func2(struct test copy);
void func1(struct test copy) {func2(copy);}
> m32c-unknown-elf-gcc -Os -S pr42722.c
> cat pr42722.s 
        .file   "pr42722.c"
.text
        .global _func1
        .type   _func1, @function
_func1:
        enter   #0
        push.w  11[fb]
        push.w  9[fb]
        push.w  7[fb]
        push.w  5[fb]
        jsr.a   _func2
        add.w   #8,sp
        exitd
        .size   _func1, .-_func1
        .ident  "GCC: (GNU) 4.4.3"

which looks correct to me (not knowing m32c asm at all). With a larger struct
gcc generates a memcpy() call instead.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42722