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Floating-Point Support for Older Code (Visual C++)
Visual Studio 2015
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The latest version of this topic can be found at Floating-Point Support for Older Code (Visual C++).
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.
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