On Thu, Apr 14, 2011 at 4:21 PM, Peter Bigot <big...@acm.org> wrote:
> And yes, if you did it in assembler, you could use a 20-bit immediate.
>
> Peter
>
> >> Can the msp430X instruction set even access a 20 bit immediate field?
>
This is kind of what I was getting at....
From my original post:
> Anyone know how to get 20 bit immediate in gcc extended asm?
>
> ie.
>
> __asm__ __volatile__ ("movx.a %1,%0":"=m" (DMA0SA):"i" (0xefefeUL));
Note the immediate field is 0xefefe (20 bits).
>
> which unfortunately generates...
>
> __asm__ __volatile__ ("movx.a %1,%0":"=m" (DMA0SA):"i" (0xefefeUL));
> 3b12: 00 18 f2 40 fe fe d2 01 movx.a #65278,&0x001d2;#0x0fefe
looks like the immediate got tweaked from 0xefefe to 0x0fefe.
>From what I've figured out from the user's guide, I suspect that this should
havebits for the immediate. Am I missing anything? Right now it looks to
me that
generated 00 18 f2 4e fe fe d2 01. And this is a bug in the gcc asm code
in mspgcc
3.2.3.
Am I missing anything?
> Can the msp430X instruction set even access a 20 bit immediate field?
>
--
Eric B. Decker
Senior (over 50 :-) Researcher
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