AN910 datasheet(2/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

1 OVERVIEW OF THE TEST ROUTINES

Eleven different test routines have been implemented in assembler language.

The first ten routines are oriented at measuring core computing performance. They are

based on known algorithms and represent currently used operations in 8-bit and low-end 16-

bit applications. They mix bit, 8-bit and 16-bit operations as many applications do.

This set of tests is described in Table 1.

Table 1. Test routine overview

Another test routine handling a timer interrupt has been used to measure core interrupt

processing performance:

A more precise description of the test routines is available in section 8.

Abbreviated name

Full name

Description

Features stressed

sieve

Eratosthenes sieve

find prime numbers

≥ 3 out of

8189 elements

16-bit data computation

bit manipulation

acker(m,n)1)

The couple of values used are (m,n)=(3,5) and (m,n)=(3,6)

Ackermann function

make recursive function calls

number of calls depending upon

two parameters (m,n)

function calls

stack use

string

String search

search a 16-byte string in a 128-

character array

8-bit data block manipulation

string manipulation

char

Character search

search a byte in a 40-byte array

8-bit data manipulation

char manipulation

bubble(n)2)

The values used are n=10 (words) and n=600 (words)

Bubble sort

sort of a one-dimension array of

n 16-bit integers

16-bit data manipulation

integer manipulation

blkmov(n)3)

The values used are n=64 (bytes) and n=512 (bytes)

Block move

move a n-byte block from a

place in memory to another

8-bit data block manipulation

block move

convert

Block translation

translate a 121-byte block in a

different format

8-bit data manipulation

use of a lookup table

16mul

16-bit integer multiplication

multiplication of two unsigned

words giving a 32-bit result

16-bit data computation

integer manipulation

shright

16-bit value right shift

shift a 16-bit value five places to

the right

16-bit data manipulation

bit manipulation

bitsrt

Bit manipulation

set, reset, and test of 3 bits in a

128-bit array

bit computation

bit and 8-bit data manipulation

Abbreviated name

Full name

Description

Features stressed

interrupt

Timer interrupt

standard timer input capture or/

and output compare interrupt

service routine

interrupt processing

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