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Structs pushed on stack backwards?

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Structs pushed on stack backwards?

Subject: Structs pushed on stack backwards?
From: Uli Kusterer <email@hidden>
Date: Sun, 29 Apr 2007 16:18:21 +0200

Hi,

I just had some time to get back to my current recreational programming task: Writing a little compiler on OS X. Now, I've got most of it working, but one thing confuses me a bit:

<http://developer.apple.com/documentation/DeveloperTools/Conceptual/ LowLevelABI/Articles/IA32.html>

has a diagram in "Passing Structures and Vectors" that shows that small structs get passed on the stack backwards. I.e., I have a structure

	struct PseudoPoint { float x; float y; };

and it gets passed as a parameter on the stack as:

	y
	x

Wouldn't it be easier to leave everything in its proper order? What's the rationale behind this?

 Any clues would be greatly appreciated.

Cheers,
-- M. Uli Kusterer
http://www.zathras.de

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