Trigonometric functions with FPU

Thank you mikedsouze for you answer.

Yes i'm using Floating Point Hardware 2

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i think the ci only support 18 floating point operations

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Yes, I think you are right.

Now i tried to use the Altera Floating Point Megafunctions ( SINE, ATAN,COS) as a custom instruction.

First of all, i generated the VHDL codes, then i added them as a custom instruction to the NIOS2.

In the "system.h"# define macro declarations was generated for each function like this:

# define alt_ci_ci_fp_atan_0(a,b) __builtin_custom_inii(alt_ci_ci_fp_atan_0_n,(a),(b))

# define alt_ci_ci_fp_atan_0_n 0x2

# define alt_ci_ci_fp_cosine_0(a) __builtin_custom_ini(alt_ci_ci_fp_cosine_0_n,(a))

# define alt_ci_ci_fp_cosine_0_n 0x1

# define alt_ci_ci_fp_sine_0(a) __builtin_custom_ini(alt_ci_ci_fp_sine_0_n,(a))

# define alt_ci_ci_fp_sine_0_n 0x3

Unfortunately, it doesn't work. I don't know if what i did is possible or not.

Thanks,

Best regards