[Cbe-oss-dev] spu-gcc inline asm

[Phil Pratt-Szeliga]

Hi,

Yes, I just figured that out by playing with the r and setting it to g.

This works:

  asm ("lr $3,%0;\t\n\
        brsl $0, function1;"
      : /* no output args */
      : "r" (arg1)
      );

I don't have a webpage yet, I plan to write one during my user
documentation phase at the end.
I am working to create the framework for OpenCL.  OpenCL is a new
standard by the same group
that brought OpenGL, etc.  It's purpose is to have one language that
can be compiled onto
the CPU, Cell and GPU and a runtime to supply thread ids, barriers,
etc.  I am working on
a small subset that doesn't include the OpenCL C compiler (yet).  For
part of my doctoral work
I am going to be making a source to source compiler to go from OpenCL
C to CPU/GPU/Cell.

My git repository is at:
http://github.com/pcpratts/gcc_opencl/tree/master if you want to take
a look.  Right now hardly works on the cell and the cpu is coming
along.  Even after gsoc is over
I hope to be the maintainer for this.

Phil Pratt-Szeliga

On Fri, Jul 17, 2009 at 11:17 AM, Brian Watt<bwatt at us.ibm.com> wrote:
>
> Hi Phil,
>
> Compiling with -S options produces an assember output and the error is
> coming from an andbi $3,$3,$2 which thinks that $2 is an immediate value and
> not a register, change andbi to andb at the minimum. Note: I'm interested in
> learning more about your SoC project. Do you have a webpage?
>
> Brian Watt, IBM
>
>
> Phil Pratt-Szeliga <pcpratts at syr.edu>
> Sent by: cbe-oss-dev-bounces+bwatt=us.ibm.com at lists.ozlabs.org
>
> 07/17/2009 09:32 AM
>
> To
> cbe-oss-dev at lists.ozlabs.org
> cc
> Subject
> [Cbe-oss-dev] spu-gcc inline asm
>
>
>
>
> Hello,
>
> I am doing something for google summer of code (I am working on opencl
> for gcc) and I am having trouble jumping
> to a function that is downloaded at runtime.
>
> The first step is to jump to a function with arguments.  It works
> using inline assembly using no arguments, but I can't
> figure out how to make it work with an argument.  Is the spu-gcc
> inline assembly syntax different?
>
> Sincerely,
> Phil Pratt-Szeliga
>
>
> /* spu_example.c */
> /* compile with: spu-gcc spu_example.c*/
>
> void function1(unsigned long long arg)
> {
>    printf("hello world %llu\n", arg);
> }
>
> int main(unsigned long long spe_id, unsigned long long
> program_data_ea, unsigned long long env) {
>
>  /* works fine */
>  function1(10);
>
>  /* works fine */
>  unsigned long long arg1 = 20;
>  asm("andbi $3,$3,20;\
>       brsl $0, function1;");
>
>  /* gives me the compiler error #1 */
>  asm ("andbi $3,$3,%0"
>      : /* no output args */
>      : "r" (arg1)
>      );
>  asm("brsl $0, function1");
> }
>
>
> /* Compiler error #1:
>
> /tmp/ccyF7J51.s: Assembler messages:
> /tmp/ccyF7J51.s:249: Warning: Treating '$2' as a symbol.
> /tmp/ccmkHyG2.o: In function `main':
> spu.c:(.text+0x3a0): undefined reference to `$2'
> collect2: ld returned 1 exit status
>
> */
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