Jonas Maebe schrieb:
On 30 Aug 2012, at 23:50, Dimitrios Chr. Ioannidis wrote:
"The MMX and floating-point stack registers (MM0-MM7/ST0-ST7) are
preserved across context switches. There is no explicit calling
convention for these registers. The use of these registers is
strictly prohibited in kernel mode code."
That is unrelated to whether or not their use is deprecated. If they
weren't preserved across context switches, virtually no 32 bit
Windows program would still work on 64 bit Windows.
Thanks for the detailed information.
One thing seems to be clear: the instructions to save the CPU state have
to be used in context switches. Now it depends on the available
instructions, whether the FPU state is always included; this again may
be different for the 32 and 64 bit instructions or drivers (dunno).
DoDi
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