Compiler/TMS320F28379S: TMU function call

Everything looks correct.  I'm not sure how the results differ from what you expect.

What follows is a small example that illustrates how this intrinsic works.

>>>type file.c
double fxn(double arg)
{
   return __sinpuf32(arg);
}

>>>cl2000 --tmu_support=tmu0 --src_interlist file.c

The option --src_interlist tells the compiler to not delete the auto-generated .asm file, and to add comments to it that make it easier to understand.  Inspect file.asm to see these lines ...

;----------------------------------------------------------------------
;   3 | return __sinpuf32(arg);
;----------------------------------------------------------------------
        SINPUF32  R0H,R0H               ; [CPU_] |3|

There is no call to a function named __sinpuf32.  Instead, the instruction SINPUF32 is used.  

To understand more about intrinsics like this work, please see the section titled Using Intrinsics to Access Assembly Language Statements in the C2000 compiler manual.

Thanks and regards,

-George