Author: James Robertson
Date: 20:43:14 01/23/99
Go up one level in this thread
On January 23, 1999 at 21:08:22, Bruce Moreland wrote:
>
>On January 23, 1999 at 16:30:24, James Robertson wrote:
>
>>In my prog I have written:
>>
>>void Func(int **i) {
>> __asm {
>> mov eax,i
>> mov ebx,[eax]
>> }
>>}
>>
>>I am hoping there is some assembler instruction that combines both operations
>>into one.
>>
>>Later on in the function I have:
>>
>>void Func(int **i){
>> __asm {
>> mov eax,i
>> mov ebx,something_useful
>> mov [eax],ebx
>> }
>>}
>>
>>Is there any way to shorten this? Mr. Nalimov mentioned that Intel has a file
>>somewhere with all the assembler instuctions explianed, but I downloaded it in
>>Acrobat format, and I am too lazy to download Acrobat. Figured it would probably
>>be a little easier to post here. :)
>>
>>James
>
>If there is an instruction that lets you load a register and indirect, it is
>news to me.
>
>One way to learn how to do assembler is to watch what the compiler does. You
>can do this by looking at the assembly listings (-Fa or -Fc with the Microsoft
>compiler).
Yep, that's exactly how I learned.
>
>I recommend also that if you convert a routine from C to assembly, that you >keep
>the C routine around and compare to see which is faster. If you can't tell
>which one is faster, I recommend keeping the C routine and discarding the
>assembler.
Absolutely. Assembler routines are really hard to read, and I guess they are not
very portable either. In this case however, it is an instruction that appears
tens of millions of times in a search, so speeding it up would be nice.
James
>
>bruce
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