怎么在16F1937的C代码中使用asm

大家好，我在使用16F1937处理器的C项目中遇到了一些困难。我的开发工具实际上是带有XC 8编译器V1.42，免费模式的MPLAB X V3.61。在我的项目中，刚刚从ASM移植到C，我需要一个具有16位结果的快速乘法8位×8位。就像原来的ASM项目一样。C移植完成后，由于C的缓慢乘法，我看到了一些执行延迟，只是想一个想法C函数的持续时间大约是ASM函数的2.5倍。说，我决定只用ASM中的乘法运算，现在一切都很好，但是我花了很多。在阅读大量文章和XC8用户指南的时候，在我看来，对于C代码中包含的ASM没有详细的说明。对于我来说，编写的代码不是那么“漂亮”，但实际上是找到的唯一方法，而且没有XC8C的抱怨。OMPELER。这是使用的代码，希望对其他人有用。EMANUELE。



      以下为原文

    Hello everybody, I've had some difficulties using assembly code inside a C project with 16F1937 processor.
My development tool is actually MPLAB X V3.61 with XC 8 Compiler V1.42, free mode.
In my project, just now ported from asm to C, I need a fast multiplication 8 bit * 8 bit with a 16 bit result, as it was in original asm project. Once the C porting was completed, I see some delays in execution due to the slow multiplication introduced by C, just to have an idea C function has a duration of about 2.5 times asm function.
Said that, I've decided to use only multiplication in asm, and now everything works fine, but I spend a lot of time to find something that really works after reading a lot of posts and the XC8 user guide, that, in my opinion, is not properly detailed about asm included in C code.
The code written is not so 'beautiful' for me, but actually is the only way found that works and gives no complains from XC8 compiler.
This is the code used, I hope it will be useful for someone else.

Emanuele.
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