On Thursday 10 April 2008 06:54, Weddington, Eric wrote:
> > /* avr-gcc 4.4-20080404 + binutils 2.18 produce incorrect code: the
> > foo4()
> > function stores 0 value to 'vp' variable.
> > Options: -W -Wall -Os -mmcu=atmega2560
> > */
> >
> > The code generated by 4.3.0 + Andy's combine patch shows that
> > the foo4()
> > function does NOT store 0 value to 'vp' variable. At least that's my
> > interpretation. As to the validity of what it is storing, I don't know
> > about that.
>
> On further reflection, let me add to the above.
>
> Dmitry, did you mean that this code:
> ldi r24,lo8(gs(foo4))
> ldi r25,hi8(gs(foo4))
> sts (vp)+1,r25
> sts vp,r24
> Stores an effective 0 value to 'vp'? That lo8(gs(foo4)) and hi(gs(foo4))
> evaluate to zero? I was interpreting what you wrote as it stored an
> immediate value of zero to 'vp'. I do not have a FSF GCC stock 4.3.0
> (unpatched) on which to reproduce here. Could you perhaps show the
> assembly that it produces?
Hi.
Yes, I have obtain the same result of compilation.
Incorrect is result of linking (avr-objdump -d):
ldi r24, 0
ldi r25, 0
in case of foo4() only.
The trampoline stub for foo4() was created correctly.
Regards,
Dmitry.
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