The macro function intrinsics listed here are designed for the IntelŪ PentiumŪ 4 processor with Streaming SIMD Extensions 3 (SSE3).
The prototypes for these intrinsics are in the pmmintrin.h header file.
Macro arguments: one of __MM_DENORMALS_ZERO_ON,
This causes "denormals are zero" mode to be turned on or off by setting the appropriate bit of the control register.
No arguments. This returns the current value of the denormals are zero mode bit of the control register.