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Re: Raster Control [message #15126 is a reply to message #15124]

Tue, 01 April 2008 21:57

mr_ped
Messages: 826
Registered: November 2005
Location: Czech Republic - Praha

Experienced Contributor

Not only it is divided into C/ASM, but both code paths are different.

The ASM version works purely with integers, while the C version with (double) will lead to decimal division at least, if not multiply (I'm not that big C guru to fully understand how that casting to double will propagate to the rest of calculations).

To get maybe identical version in C you may try:

return ((x * y) / z);

I'm not sure it will compile absolutely identically, but I think the chances are very good... feel free to compile into ASM firstly and check the result of GCC ASM (-S command line switch?).

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[Message index]

		Raster Control By: mdelfede on Thu, 20 March 2008 21:58
		Re: Raster Control By: mrjt on Tue, 01 April 2008 11:22
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 14:09
		Re: Raster Control By: mrjt on Tue, 01 April 2008 15:11
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 15:38
		Re: Raster Control By: mrjt on Tue, 01 April 2008 16:13
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 18:52
		Re: Raster Control By: mrjt on Tue, 01 April 2008 19:08
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 21:05
		Re: Raster Control By: mr_ped on Tue, 01 April 2008 21:57
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 22:14
		Re: Raster Control By: mdelfede on Tue, 01 April 2008 22:59
		Re: Raster Control By: mr_ped on Tue, 08 April 2008 17:34
		Re: Raster Control By: mdelfede on Wed, 09 April 2008 10:28
		Re: Raster Control By: mr_ped on Wed, 09 April 2008 10:59

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