Inline Assembly replacement for par

[reinhartf]

I have been working with xc for a while now but due to bugs in the xmos compiler I cannot use a par statement for use inside a stage 2 loader.

It has been suggested that I implement the par statement using inline assembly, but I have never used it before, so can someone please provide an example or point me in the right direction as to where to start with this.

Thanks

[Bianco]

Code: Select all

    getr      r4,        3        // get a thread synchroniser, store in r4
    getst     r11,       res[r4]  // get synchronised thread, bound on the thread synchroniser in r4
    init      t[r11]:sp, r1       // set stack pointer of new thread
    init      t[r11]:pc, r0       // set PC of new thread
    set       t[r11]:r0, r2       // set r0, argument of new thread
    set       t[r11]:r1, r3       // set r1, chanend of new thread
    ldaw      r0,        dp[0]    // load value of data pointer in r0
    init      t[r11]:dp, r0       // set data pointer of new thread
    add       r1,        r11,  0  // copy thread resource id to r1
    ldaw      r11,       cp[0]    // load value of constant pointer in r11 
    init      t[r1]:cp,  r11      // set constant pointer of new thread
    msync     res[r4]             // start new thread

Something like this should get you started, it's a copy paste of another project of mine, so you may want to make changes to suite your needs. In this case one new thread is started. It needs some additional code and modifications to start multiple threads at the same time and wait for them to complete. Try to make a program with par statement and study the generated assembly code to figure out that.

[reinhartf]

Code: Select all

    getr      r4,        3        // get a thread synchroniser, store in r4
    getst     r11,       res[r4]  // get synchronised thread, bound on the thread synchroniser in r4
    init      t[r11]:sp, r1       // set stack pointer of new thread
    init      t[r11]:pc, r0       // set PC of new thread
    set       t[r11]:r0, r2       // set r0, argument of new thread
    set       t[r11]:r1, r3       // set r1, chanend of new thread
    ldaw      r0,        dp[0]    // load value of data pointer in r0
    init      t[r11]:dp, r0       // set data pointer of new thread
    add       r1,        r11,  0  // copy thread resource id to r1
    ldaw      r11,       cp[0]    // load value of constant pointer in r11 
    init      t[r1]:cp,  r11      // set constant pointer of new thread
    msync     res[r4]             // start new thread

Something like this should get you started, it's a copy paste of another project of mine, so you may want to make changes to suite your needs. In this case one new thread is started. It needs some additional code and modifications to start multiple threads at the same time and wait for them to complete. Try to make a program with par statement and study the generated assembly code to figure out that.

Great, thanks for the example. I actually got my code to work so I hope some else will benefit from you help.