TMU sin function

Hi all 

I am using the TMX320F28075 device.

It seems to me that calculations are taking much more time than expected.

I tried to calculate sine function. As the device is having internal TMU sin function must be faster. Here is the compiler flag summary.

-v28 -ml -mt --cla_support=cla1 --float_support=fpu32 --tmu_support=tmu0 --fp_mode=relaxed --include_path="C:/ti/ccsv6/tools/compiler/ti-cgt-c2000_16.9.0.LTS/include" --include_path="D:/projects/background study software/sin pwm/hw_files" --advice:performance=all -g --diag_warning=225 --diag_wrap=off --display_error_number

I have implemented TMU support.

I also suspect that the system clock may be slower  but I am not able to measure it I have posted a separate thread for that. (https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/561091).

But not just suspecting system clock (because I have PWM module working correctly), what should be the reason for sine calculations to take that much of time.

The code I am evaluating is

       GpioDataRegs.GPASET.bit.GPIO31 =1 ;//to profile code timing

       sin_r = sin(0);

       sin_y = sin(0);

       sin_b = sin(0);

       GpioDataRegs.GPACLEAR.bit.GPIO31 =1 ; //to profile code timing

This takes around 4.9uS.

Disassembly of this code             

693         GpioDataRegs.GPASET.bit.GPIO31 =1 ;//to profile code timing

08216b:   761F01FC    MOVW         DP, #0x1fc

08216d:   1A038000    OR           @0x3, #0x8000

 733        sin_r = sin(0);

08216f:   E590        ZERO         R0

082170:   764830F4    LCR          __relaxed_sin

082172:   761F0242    MOVW         DP, #0x242

082174:   E203001E    MOV32        @0x1e, R0H

 734        sin_y = sin(0);

082176:   E590        ZERO         R0

082177:   764830F4    LCR          __relaxed_sin

082179:   761F0242    MOVW         DP, #0x242

08217b:   E203001C    MOV32        @0x1c, R0H

 735        sin_b = sin(0);

08217d:   E590        ZERO         R0

08217e:   764830F4    LCR          __relaxed_sin

082180:   761F0242    MOVW         DP, #0x242

082182:   E2030020    MOV32        @0x20, R0H

 745        GpioDataRegs.GPACLEAR.bit.GPIO31 =1 ; //to profile code timing

Can you please help me with this?