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Re: "better" version of Iscale functions [message #15231 is a reply to message #15227]

Thu, 10 April 2008 18:01

mirek is currently offline

mirek
Messages: 14267
Registered: November 2005

Ultimate Member

mdelfede wrote on Thu, 10 April 2008 09:07

luzr wrote on Thu, 10 April 2008 02:44

Now, this is an argument Smile

Smile

Applied. (I have deleted float version altogether - either it is MSC on Win32 which is unable to do it right using int64, or it is GCC or MSC on ARM and ARM does not have FP).

Mirek

Well, even if usually MSC optimizes better than GCC

Actually, this is no longer true. I am not sure when it happened (IMO sometime around 4.1 version Smile

Smile

, but current GCC produces faster code on average.

Quote:

BTW, I'm surprised on how bad does it MSC, having hardware instruction on x86 processors for 32x32->64 bit multiply (signed AND unsigned) and 64/32->32 bit divide. Maybe they're still anchored to good old 8088 assembly code... Smile

Smile

I guess they just do not detect that it is 32x32... and just use normal 64x64 routine.

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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