Hi,

I am struggling with the lburg syntax. I can get it to emit the most basic instructions but don't fully grasp how to do certain things. The book is not helping either.

I have an instruction that loads a memory word into a reg using a base and offset, each in a reg:

ldw.i tgt-reg, (offset, base)

I can't figure out how to describe this addressing mode in my lburg file. How do I tell it, it should load atlas a base into a reg first?

Any pointers in the right direction would be appreciated.
Erwin

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is this, for example loading a local from the stack frame?
I handle something a bit similar with a macro where LCC emits ld2 tgt-reg,base-reg,offset-constant and a macro does the loading of base plus offset into a register and then loading the value. Could you do that?


On Sunday, March 12, 2017 at 6:56:17 AM UTC-4, erwin.ma...@gmail.com wrote:

Hi,

I am struggling with the lburg syntax. I can get it to emit the most basic instructions but don't fully grasp how to do certain things. The book is not helping either.

I have an instruction that loads a memory word into a reg using a base and offset, each in a reg:

ldw.i tgt-reg, (offset, base)

I can't figure out how to describe this addressing mode in my lburg file. How do I tell it, it should load atlas a base into a reg first?

Any pointers in the right direction would be appreciated.
Erwin

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

This could be loading a local, but could also be loading a global.

I could do it with a macro, but then I would have to dedicate a register to just this use case? Since the macro cannot now if LCC has used any of its available regs..

I was wondering if there wasn't a way to achieve this through LCC itself...

Erwin


Op zondag 12 maart 2017 12:48:12 UTC+1 schreef bill rowe:

is this, for example loading a local from the stack frame?
I handle something a bit similar with a macro where LCC emits ld2 tgt-reg,base-reg,offset-constant and a macro does the loading of base plus offset into a register and then loading the value. Could you do that?

On Sunday, March 12, 2017 at 6:56:17 AM UTC-4, erwin.ma...@gmail.com wrote:

Hi,

I am struggling with the lburg syntax. I can get it to emit the most basic instructions but don't fully grasp how to do certain things. The book is not helping either.

I have an instruction that loads a memory word into a reg using a base and offset, each in a reg:

ldw.i tgt-reg, (offset, base)

I can't figure out how to describe this addressing mode in my lburg file. How do I tell it, it should load atlas a base into a reg first?

Any pointers in the right direction would be appreciated.
Erwin

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)