llvm dev - Dec 2009 - [LLVMdev] problem when use inline asm for msp430 target

Hi everyone,

inline asm code is like below:

void test(unsigned short a) {
   asm("myinstr          my16bitreg, %0"::"r"(a));
}
I want it generate instruction "myinstr          my16bitreg, r15"

I execute
llc test.bc -march = msp430 -o test.s
then it reports
"LLVM ERROR: Couldn't allocate input reg for constraint 'r'
!"

What's the reason?

Thanks
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Hello
> inline asm code is like below:
>
> void test(unsigned short a) {
>    asm("myinstr          my16bitreg, %0"::"r"(a));
> }
> I want it generate instruction "myinstr          my16bitreg, r15"
>
> I execute
> llc test.bc -march = msp430 -o test.s
> then it reports
> "LLVM ERROR: Couldn't allocate input reg for constraint
'r' !"
Works for me. Make sure you're using latest LLVM trunk. inline asm for
msp430 were not available with 2,6 release iirc.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Mine is LLVM2.6's release version, so it doesn't work

Thank you!



2009/12/18 Anton Korobeynikov <anton at korobeynikov.info>
> Hello
>
> > inline asm code is like below:
> >
> > void test(unsigned short a) {
> >    asm("myinstr          my16bitreg, %0"::"r"(a));
> > }
> > I want it generate instruction "myinstr          my16bitreg,
r15"
> >
> > I execute
> > llc test.bc -march = msp430 -o test.s
> > then it reports
> > "LLVM ERROR: Couldn't allocate input reg for constraint
'r' !"
> Works for me. Make sure you're using latest LLVM trunk. inline asm for
> msp430 were not available with 2,6 release iirc.
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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Hi Anton,

Need i write additial c/c++/td code for my target to support inline asm?

Regrads

2009/12/18 Anton Korobeynikov <anton at korobeynikov.info>
> Hello
>
> > inline asm code is like below:
> >
> > void test(unsigned short a) {
> >    asm("myinstr          my16bitreg, %0"::"r"(a));
> > }
> > I want it generate instruction "myinstr          my16bitreg,
r15"
> >
> > I execute
> > llc test.bc -march = msp430 -o test.s
> > then it reports
> > "LLVM ERROR: Couldn't allocate input reg for constraint
'r' !"
> Works for me. Make sure you're using latest LLVM trunk. inline asm for
> msp430 were not available with 2,6 release iirc.
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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