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Title: can i code like this in 64 bit instead?
Post by: daydreamer on October 07, 2022, 08:50:36 PM

64 bit winabi register preservation rules apply to gdi as well?
Is it possible to have a loop with one or more xmm regs hold data and trust gdi calls keep them preserved,so i can use them in a loop?
But in 32bit i need to preserve registers myself before call ?

Title: Re: can i code like this in 64 bit instead?
Post by: hutch-- on October 09, 2022, 12:18:17 AM

They apply to everything. Registers are registers.

Title: Re: can i code like this in 64 bit instead?
Post by: zedd151 on October 12, 2022, 05:16:46 AM

http://masm32.com/board/index.php?topic=783.0 (http://masm32.com/board/index.php?topic=783.0)
Don't know if this might help Magnus but I came across that thread during my wanderings about the forum and remember this one. :biggrin:

Title: Re: can i code like this in 64 bit instead?
Post by: HSE on October 12, 2022, 10:39:45 AM

Hi daydreamer!

Quote from: daydreamer on October 07, 2022, 08:50:36 PM
Is it possible to have a loop with one or more xmm regs hold data and trust gdi calls keep them preserved,so i can use them in a loop?

In theory, any procedure that follow x64 ABI must preserve xmm6 through xmm15. And GDI must not be an exception.

But that give me the idea :thumbsup:

Now I added pseudo push/pop of XMM registers:

Code Select

freg_push xmm6
  · · ·
freg_pop xmm6

Test is with ML64 (and removing xmm6 preservation :biggrin:).

Regards, HSE.

Title: Re: can i code like this in 64 bit instead?
Post by: daydreamer on October 12, 2022, 06:48:49 PM

great Hector :thumbsup:
now I understand it better,thanks Zedd,Hutch,Hector

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