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Re: "better" version of Iscale functions [message #15138 is a reply to message #15129]

Wed, 02 April 2008 15:11

mirek
Messages: 14265
Registered: November 2005

Ultimate Member

mdelfede wrote on Tue, 01 April 2008 17:10

BTW, we could completely drop the assembly code, as-is it's not portable between compilers with greater integer width.

Yes, but int64 does not come cheap on non-64 architecture. Maybe even that FP computation could be faster. Of course, as long as FP is performed by HW. For ARM this new iscale can be good.

Quote:

My version is also *not* portable on compilers with 64 bit wide integers, but can be made ok just changing function prototype :

int32_t iscale(int32_t x, int32_t y, int32_t z)

Leaving so to the compiler the integer width check and warnings.

IMO, that really is not that bug trouble, as any serious portable code should work with 32-bit int.

Mirek

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[Message index]

		"better" version of Iscale functions By: mdelfede on Tue, 01 April 2008 23:10
		Re: "better" version of Iscale functions By: mirek on Wed, 02 April 2008 15:11
		Re: "better" version of Iscale functions By: mdelfede on Wed, 02 April 2008 16:48
		Re: "better" version of Iscale functions By: mirek on Sun, 06 April 2008 04:47
		Re: "better" version of Iscale functions By: mdelfede on Sun, 06 April 2008 19:36
		Re: "better" version of Iscale functions By: mdelfede on Sun, 06 April 2008 20:05
		Re: "better" version of Iscale functions By: mdelfede on Sun, 06 April 2008 20:14
		Re: "better" version of Iscale functions By: mirek on Thu, 10 April 2008 02:44
		Re: "better" version of Iscale functions By: mirek on Thu, 10 April 2008 02:46
		Re: "better" version of Iscale functions By: mdelfede on Thu, 10 April 2008 15:07
		Re: "better" version of Iscale functions By: mirek on Thu, 10 April 2008 18:01
		Re: "better" version of Iscale functions By: mdelfede on Fri, 11 April 2008 09:26
		Re: "better" version of Iscale functions By: mirek on Sun, 06 April 2008 04:51

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