[Question] A macro that calculates

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l4m2

Joined: 15 Jan 2015
Posts: 674

l4m2 13 Mar 2016, 05:41

Code:

macro calcu expr {
  match a p b, expr \{
    mov eax, a
    if (p) eq (+)
      add eax, b
    else if (p) eq (-)
      sub eax, b
    else if (p) eq (*)
      mul b
    else if (p) eq (/)
      div b
    else if (p) eq (%)
      div b
      mov edx, eax
    end if
  \}
}

A simple macro calculating a op b and put the result into eax.
1) for equations like ecx*edx+ebx, an improved macro is required.
2) for (4+5)*eax, is it possible that 4+5 is calculated when compiling?

13 Mar 2016, 05:41

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 13 Mar 2016, 06:52

l4m2 wrote:

2) for (4+5)*eax, is it possible that 4+5 is calculated when compiling?

Yes.

13 Mar 2016, 06:52

l4m2

Joined: 15 Jan 2015
Posts: 674

l4m2 13 Mar 2016, 13:27

"irps x, 2*(3+5)" splits it into 2, *, (, 3, +, 5, ). Therefore blanket matching needed to be done in the code

13 Mar 2016, 13:27

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 13 Mar 2016, 13:41

You can use "match" for more sophisticated expressions.

13 Mar 2016, 13:41

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