AN720 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

AN720

PRECISION32 OPTIMIZATIONCONSIDERATIONS FOR CODESIZE ANDSPEED

Silicon Laboratories 

AN720

6.3. Toolchain Library Usage

Some toolchains have multiple libraries or settings that can change the size or execution speed of code.

The Keil µVision tools have two options: standard and MicroLIB. To switch between the two:

1. Right-click on the project_name in the Project window and select Options for Target ‘project_name’ or

go to ProjectOptions for Target ‘project_name’.

2. Select the Target tab.

3. Use the Use MicroLIB checkbox to select the library.

Figure 10 shows this dialog in the µVision IDE.

Figure 10. Using the µVision IDE to Select the Project Library

Using the sim3u1xx_Blinky and demo_si32UsbAudio default examples in the si32HAL 1.0.1 software package,

Table 15 and Table 16 show the relative Debug build sizes with the different toolchain library options. Table 17

shows the Debug build sizes for CoreMark, and Table 18 shows the relative CoreMark speed scores for each of

these library options.

Table 15. Keil Toolchain Library Usage Comparison—sim3u1xx_Blinky Debug

Library

µVision standard

µVision MicroLIB

Code (bytes)

2296

2068

Read Only Data

(bytes)

312

296

Read-Write Data

(bytes)

24

24

Zero-Initialized

Data (bytes)

1632

1536

Rev. 0.1

19

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