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Subject: windows for AMD64 - MMX not 64-bit threadsafe

Author: Gerd Isenberg

Date: 14:42:42 08/26/03

Hmm... that makes using these register impossible - at least with a
multithreading approach. Eight bitboard (or float) register for nothing, or only
a few percent faster context switch. Ok, there are still the 16 (14) general
purpose bitboards and 32 XMM bitboards, nevertheless...

Gerd


Porting Windows® Device
Drivers to AMD64 Platforms

Page 7

• Convert media instruction to SSE/SSE2 Instructions

Microsoft Windows for AMD64 will not context switch x87, 3Dnow!, MMX for 64-bit
native threads. This code may be converted to SSE/SSE2 through the use of
intrinsic functions.

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Last modified: Thu, 15 Apr 21 08:11:13 -0700

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