| Optimization Focus | IAR 1.40.1 | SDCC (Free) | Cosmic (Paid) | | :--- | :--- | :--- | :--- | | Code Size (Dhrystone) | 100% (baseline) | ~120–140% | ~105–115% | | Execution Speed | Fast | Moderate | Good | | Interrupt Latency | Low (optimized prologue/epilogue) | Higher | Moderate |
Note: Version 1.40.1 does include support for the newer STM32 family (ARM Cortex-M). 4. Performance & Code Density The primary advantage of IAR EWSTM8 over free alternatives (like SDCC) is code density.
| Family | Target Application | Example Devices | | :--- | :--- | :--- | | | General-purpose industrial | STM8S003, STM8S105, STM8S207 | | STM8L | Ultra-low-power (150 µA/MHz) | STM8L051, STM8L152, STM8L101 | | STM8A | Automotive (AEC-Q100) | STM8AF62, STM8AL31 |
