[RFC]Math: Trignometry: Added cordic cos function #4053

ShriramShastry · 2021-04-19T13:15:52Z

…ange is [-2pi to 2pi] and output range is [-1 to +1] Mean and maximum value for the difference between floating to fixed point output is 3.2136e-09 and 0.0000000596

Signed-off-by: ShriramShastry malladi.sastry@intel.com

cujomalainey

please address checkpatch comments, also im not sure if Johny has mentioned but we are seeing a performance regression with the new sign function that i think we need to figure out before we land this

test/cmocka/src/math/trig/sin_fixed.c

test/cmocka/src/math/trig/cos_fixed.c

ShriramShastry · 2021-04-20T02:27:04Z

please address checkpatch comments, also im not sure if Johny has mentioned but we are seeing a performance regression with the new sign function that i think we need to figure out before we land this

It seems exp_fixed function is consuming most of the computation time in 3 band DRC. CORDIC SINE when compared with old sine performs better #3990 (comment)

src/math/trig.c

paulstelian97 · 2021-04-20T08:51:13Z

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

ShriramShastry · 2021-04-20T09:07:19Z

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes, this is done by the during coordinate check pi/2. Variable xn and b_yn share

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes , this is done during co-ordinate check. th_rad_fxp = sign * b_yn; for sine and th_rad_fxp = sign * xn for cosine.

paulstelian97 · 2021-04-20T09:09:11Z

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes, this is done by the during coordinate check pi/2. Variable xn and b_yn share

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes , this is done during co-ordinate check. th_rad_fxp = sign * b_yn; for sine and th_rad_fxp = sign * xn for cosine.

Guess that's a lot of common code then, we can factor out the common part into a single function to avoid code duplication.

ShriramShastry · 2021-04-20T09:16:17Z

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes, this is done by the during coordinate check pi/2. Variable xn and b_yn share

Isn't it literally possible to do cos(x) = sin(pi/2 - x)?

Yes , this is done during co-ordinate check. th_rad_fxp = sign * b_yn; for sine and th_rad_fxp = sign * xn for cosine.

Guess that's a lot of common code then, we can factor out the common part into a single function to avoid code duplication.

Yes. That's correct, will make common function with a separator for sine and cosine.

src/math/trig.c

src/audio/Kconfig

paulstelian97

I assume by now the mathematical kinks of the function itself are solved (and thus we now know it's correct); the code itself looks good.

src/audio/drc/drc_math_generic.c

src/include/sof/math/trig.h

src/audio/drc/drc_math_generic.c

test/cmocka/src/math/trig/cos_16B_fixed.c

test/cmocka/src/math/trig/cos_32B_fixed.c

src/include/sof/math/trig.h

Cordic sin cos input value range is [-2*pi to 2*pi] and output range is [-1 to +1] This is common function to calculate trignometric sine and cosine using separate lookup table size for speeds and accuracy calculation. For 32bit sine and cosine Error (max = 0.000000011175871), THD+N = -170.152933 For 16bit sine and cosine Error (max = 0.000061), THD+N = -91.518584 Signed-off-by: ShriramShastry <malladi.sastry@intel.com>

singalsu

Looks good, thanks Sriram!

singalsu

Re-approve, previous got cleared.

lgirdwood · 2021-05-19T09:57:47Z

src/audio/drc/drc_math_generic.c

 inline int32_t drc_sin_fixed(int32_t x)
 {
-	const int32_t PI_OVER_TWO = Q_CONVERT_FLOAT(1.57079632679489661923f, 30);
+	const int32_t PI_OVER_TWO = Q_CONVERT_FLOAT(1.57079632679489661923, 30);


These will only be inline if they are used in the same C file. @ShriramShastry can you do an incremental update that takes all these small inline maths function and moves them to the maths headers (and changes them to static inline).
This will save us a function call on all our small maths ops.

Thanks Liam, Seppo. I have a new PR #4218 to include your inputs.

lgirdwood · 2021-05-19T09:59:39Z

src/math/trig.c

+ */
+inline int32_t sin_fixed_32b(int32_t th_rad_fxp)
+{
+	int32_t sign;


e.g. here, as this will generate 2 function calls when used outside of trig.c i.e.

sin_fixed_32b()

cordic_sin_cos()

We want to eliminate call 1.

Same for all the other small maths functions.

ShriramShastry force-pushed the shastry_cordiccos_dev branch 5 times, most recently from 458b5f3 to 81a0484 Compare April 19, 2021 14:07

ShriramShastry changed the title ~~Math: Trignometry: Added cordic cos function Cordic cos input value r…~~ [RFC]Math: Trignometry: Added cordic cos function Apr 19, 2021

lgirdwood requested review from cujomalainey, johnylin76 and singalsu April 19, 2021 15:38

cujomalainey suggested changes Apr 19, 2021

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lgirdwood merged commit 845c278 into main May 19, 2021

lgirdwood deleted the shastry_cordiccos_dev branch May 19, 2021 10:00

singalsu mentioned this pull request May 19, 2021

[BUG] Reduce footprint by putting large items under kconfig options #3480

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[RFC]Math: Trignometry: Added cordic cos function #4053

[RFC]Math: Trignometry: Added cordic cos function #4053

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