[SDL] SDL (1.2.6) CPU identification bug

Sam Lantinga slouken at devolution.com
Mon Nov 24 15:11:07 PST 2003


> Pentium 4 Mobile chips may crash with an illegal instruction.

> The problem has to do with this code:

> 		f=CPU_Flags();
>                 if((f&(TDNOW_CPU|MMX_CPU))==(TDNOW_CPU|MMX_CPU))
> 		    return BlitRGBtoRGBPixelAlphaMMX3DNOW;

> Unfortunately, the P4M has those bits set, even though it's not an Athlon
> of any sort.  This results in SIGILL crashes.

This is fixed in CVS, along with a new API for CPU feature detection.
Feel free to check it out!
http://www.libsdl.org/cvs/SDL-1.2.tar.gz (PRERELEASE CODE)

See ya!
	-Sam Lantinga, Software Engineer, Blizzard Entertainment




More information about the SDL mailing list