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最近由於使用MPLAB免費提供的HITECH C PICC LITE寫的一些程式，
由於是免費版的，可以使用的PRORAM區有受限，
程式編譯完成後，我嚇了一跳，
居然快使用到受限制程式區的九成，
雖然免費版的程式空間限制只有2K WORDS，如果是PIC16F877A，程式空間是有8KH的，
可是我仍覺得編譯的結果程式還是太大，所以我決定下載HITECH C PRO來試試看。
一樣的程式，丟到HITECH PRO去編譯，結果雖然可用的程式空間變成8KH
不過編譯的程式更大了，好的是在DATA MEMORY變小了，
不過讓我覺得有點失望，畢竟PRO版的是要花$1495，而且其誇耀的Omniscient Code Generation™ Compilation Technology，
似乎沒非常強大在程式區的編譯上，
接下來我想修改程式碼寫法，看看能不能讓編是程式便的小一些。
附註說明：為什麼要使用PRO版呢?
因為PRO有一種Omniscient Code Generation™ Compilation Technology，
在文件上是這樣說的：
Code compiled using Omniscient Code Generation can deliver up to 2X the code density,
80% RAM utilization and reduces interrupt latency by 40-60%, saving you time, power and money
PRO 與 LITE的比較：
| HI-TECH C PRO for the PIC10/12/16 MCU Family | PRO mode | Lite† mode |
|---|---|---|
| Pricing | ||
| Single-User License List Price | $1495 | Free |
| Technical Support | HI-TECH Priority Access™ included | Available |
| HI-TECH Satisfaction Guarantee (30 day money back guarantee) | Yes | Free |
| Optimization | ||
| Overall optimization level | Very High | Low |
| Omniscient Code Generation™ Compilation Technology | Yes | No |
| Optimizes the size of each pointer variable in your code based on its usage | Yes | No |
| Reduces overhead required for interrupt context switching | Yes | No |
| Optimizations for rapid runtime startup and memory clearing | Yes | No |
| printf library code footprint | Compiler eliminates all unused features of printf for smallest footprint | Compiler can eliminate some unused printf features |
| Usability / Features | ||
| Support for all PIC10/12/16 MCUs | Yes | Yes |
| Unlimited Memory Usage | Yes | Yes |
| Automatically handles memory banking without requiring special qualifiers | Yes | Yes |
| Warn if potential runtime stack overflow detected | Yes | Yes |
| Eliminates the need for many non-standard C qualifiers and compiler options | Yes | Yes |
| Compatible with HI-TECH Software compact bootloader | Yes | No |
| printf library functionality | Compiler automatically detects and implements printf features required by program | Compiler detects and implements printf features used in source |
| Integrates into HI-TECH Software's IDE, HI-TIDE™ 3 | Yes | Yes |
| Fully integrates into MPLAB® IDE | Yes | Yes |
| Runs on all platforms: Windows (including 64-bit Vista), Linux and Mac OS X | Yes | Yes |
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