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ST7 AND ST9 PERFORMANCE BENCHMARKING

8.4 CHARACTER SEARCH

8.5 BUBBLE SORT

8.6 BLOCK MOVE

8.7 BLOCK TRANSLATION

8.8 16-BIT INTEGER MULTIPLICATION

Algorithm

The Character search consists in searching a byte in a 40-byte block.

Implementation

The data are also predefined. The algorithm searches the byte “o” in the 40-byte block

“-------------------------------o--------”, where the character 'o' is the 32nd character of the block.

Features stressed

As the string search, this program measures the efficiency in data comparison.

Algorithm

The Bubble sort benchmark manages the sorting of a one dimension array of 16-bit integers.

Implementation

The test is performed with 10 words and then with 600 words. The array is initialized with 10 or

600 words (16-bit integers) in reverse order.

The algorithm is a classic bubble sort which arranges the 10 words (or the 600 words) in the

ascending order of magnitude.

Note that the routine used is intentionally almost the same for the two values (as though it could

have been optimized for the first value). Few differences may exist, but they do not modify the

way the test is done.

Features stressed

This benchmark demonstrates the efficiency in data comparison and data manipulation but

especially in 16-bit value comparison and 16-bit value manipulation.

Algorithm

The Block move test routine aims at transferring a block from a place to another place in memory.

Implementation

This program is tested with a 64-byte block and with a 512-byte block.

Note that the routine used is intentionally almost the same for the two values (as though it could

have been optimized for the first value). Few differences may exist, but they do not modify the

way test is done.

Features stressed

It shows the data blocks manipulation ability.

Algorithm

The Convert test routine aims at transferring a block from a place to another place in memory.

Implementation

It uses a table to convert the source block into the destination block. The table contains the

translation of the source block elements. This benchmark is useful to convert for example from

an ASCII code to an EBCDIC code...

Features stressed

As the block move test program, it shows the data blocks manipulation ability, but also the

ability to use a lookup table.

Algorithm

The 16-bit integer multiplication program performs a multiplication of two unsigned words (16-bit

integers), giving a 32-bit result.

Implementation

The two operands chosen here are 256, so that the multiplication performed is:

256 x 256 = 65536 (=10000h hexadecimal value)

Features stressed

This test measures the computational capability of the microcontroller with 16-bit integers.

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