RM0020 datasheet(64/69 Pages) STMICROELECTRONICS

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Performance

RM0020

64/69

Note:

The number of clock cycles for third function call for N greater than or equal 42 is

num_of_cycles = 609+((N-2)/8-5)*102 (609 is number of clock cycles for N = 42 and 102 is

number of instructions in the loop).

Note:

The number of clock cycles for third function call for N greater than or equal 18 is

num_of_cycles = 91+((N-2)/4-4)*16 (91 is number of clock cycles for N = 18 and 16 is

number of instructions in the loop).

Note:

The number of instructions executed is 76+(M-2)*(39+53*(N-4)/4).

Table 46.

mfb50_pmh - pressure sensing function 1

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

390

308

301

2.9

0.96

488

407

3.1

0.96

598

507

3.3

0.97

693

609

3.3

0.97

362

4999

4702

4689

3.7

1.00

722

9812

9301

9279

3.7

1.00

N is length of P_MFB and V vectors.

Table 47.

mfb50_index - pressure sensing function 2

N(1)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

128

2.5

0.95

157

123

2.7

0.96

191

155

2.9

0.97

225

187

3.0

0.97

362

1585

1467

3.4

1.00

722

3116

2907

3.5

1.00

N is length of MFB vector.

Table 48.

conv3x3 - 2-D convolution with 3x3 kernel(1)

MxN(2)

First function

call [clock

cycles]

Second function

call [clock

cycles]

Third function

call [clock

cycles]

Improvement to

C function [-]

IPC

[-]

16x8

1453

1401

1399

3.0

0.97

8x16

1367

1320

1318

3.0

0.96

10x16

1767

1719

1717

3.1

0.97

32x32

12584

12484

12477

3.3

0.99

All measurements executed with convolution kernel c placed in internal RAM.

MxN is size of input and output matrix (M is number of rows).

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