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meeshoo

something interesting about __int64

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hi there. i've found on an old power point presentatinon from GDC 2002 about the efficent graphics on ARM processor that the ARM ISA is supporting temporary 64 bit integers to use for not loosing data in multiplication operations and other operations where overflow may occur. is this true on this qualcomm chipsets? (i don't have the link any more, but i have the document itself, only 108 KB).

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Yeah... if you're doing multiplication or division with fixed point 32 bit integers, you should store the temporary intermediate values in 64 bit integers to avoid overflow. This is fully supported on our chipsets, since they use ARM 9 processors.

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