C6678 IQMath IQMath_inline_all.h compiler error - function _abs could not be resolved

Hi Eddie,
Where did you download the IOMath library for C66x DSP ?

Can you please give the procedure to reproduce this build issue ?

Which example are you trying to build ?

Hi

Unfortunately, I cannot find a IQMath library for the C66x? There is nothing listed here

http://www.ti.com/product/TMS320C6678/toolssoftware

The fellow below uses the C64x library for the C6678
e2e.ti.com/.../272626

and I can only find the C64x library on the wiki
processors.wiki.ti.com/.../C64x_IQmath

Proceedure
1) Create example SYSBIOS project (seperate configuration)
2) Change files to main.c to main.cpp
3) copy the IQMath .h, and .c files to project (this is the IQMath source code thats required since I'm using inline code). 
4) Rename the IQMath tables .c file to .cpp
5) Include the path to the IQMath header files

6) add the includes below to the main.cpp file

#ifdef _INLINE_IQMATH
#include "IQmath_inline_all.h"
#else
#include "IQmath.h"
#endif

7) Define _INLINE_IQMATH in the pre-processor defines

8) Add the typedef.h file from the non-IQMath include directory (I've not idea why they didn't include this in the IQMath source code)

9) In the IQMath_inline_all.h file, add the following 

#if 1
	#warn "Eddie Changed const to #define because of compiler error: expected at ;"
	#define c1 ((I32_IQ)(0xffffffff))
	#define c2 ((I64_IQ)(0xffffffff80000000))
	#define c3 ((I64_IQ)(0x7fffffff))
	#define c4 ((I32_IQ)(0x80000000))
	#define c5 ((0xffffffff))
	#define c6 ((0x80000000))
#else
        // This causes a compiler error
	const I32_IQ c1 ((I32_IQ)(0xffffffff))
	const I64_IQ c2 ((I64_IQ)(0xffffffff80000000))
	const I64_IQ c3 ((I64_IQ)(0x7fffffff))
	const I32_IQ c4 ((I32_IQ)(0x80000000))
	const unsigned int c5 ((0xffffffff))
	const unsigned int c6 ((0x80000000))
#endif

10) Change the code in the IQMath tables file

#if 1
#warn "Eddie had to remove const to get this to compile"
    I32_IQ IQdivTable[]={
#else
	const I32_IQ IQdivTable[]={
#endif

11) Add an IQ math example to the main.cpp

Void IQMathExample()
{
#define X 2.6f
#define Y 8.4f

    I32_IQ x = _IQ24(X);
    I32_IQ y = _IQ24(Y);
    I32_IQ z;
    float Z;

    z = _IQNdiv(x, y, Q24);

    Z = _IQNtoF(z, Q24);

    System_printf("%f (%d) divided by %f (%d) equals %f (%d) \n",
            X, x, Y, y, Z);

    System_flush(); /* force SysMin output to console */

}

12) build it - this is where you get the "Function '_abs' could not be resolved..." errors (with CCSv5 but not with CCSv6)

Cheers
Eddie

Hi

I created a CCSv6 project and for some reason, it does not give the same error (project attached). Why it doesn't compile in CCSv5 is odd.

There are some changes I had to make to the IQMath library to work (see previous post or attached project). Search the code for "Eddie" or look at the compiler warnings.

If you could write a ticket for the IQMath library changes I had to make (or tell me how to not get the compile errors without the changes I made to IQMath_inline_all.h and IQMathTables.cpp), I will mark this question as answered. 

Cheers

Eddie

CCSv6_C6678_sysbiosTypical_IQMath1.7z

Edie

This is really a compiler issue. Can you please open a new thread in e2e.ti.com/.../compiler and link it to this posting?

Ran

Hi Ran
Thanks for pointing me to the correct forum. Here is the link to this thread in the compiler forum.
e2e.ti.com/.../474840

Cheers
Eddie