Overview: Intrinsics for 3rd Generation Intel® Core™ Processor Instruction Extensions

The 3rd Generation Intel® Core™ Processor Instruction Extension intrinsics are assembly-coded functions that call on 3rd Generation Intel® Core™ Processor Instructions that include new vector SIMD and scalar instructions targeted for Intel® 64 architecture processors in process technology smaller than 32nm.

To use these intrinsics, include the immintrin.h file as follows:

#include <immintrin.h>

Functional Overview

The 3rd Generation Intel® Core™ Processor Instruction Extensions include:

  • Four intrinsics that map to two hardware instructions VCVTPS2PH and VCVTPH2PS performing 16-bit floating-point data type conversion to and from single-precision floating-point data type. The intrinsics for conversion to packed 16-bit floating-point values from packed single-precision floating-point values also provide rounding control using an immediate byte.
  • Three intrinsics that map to the hardware instruction RDRAND. The intrinsics generate random numbers of 16/32/64 bit wide random integers.
  • Eight intrinsics that map to the hardware instructions RDFSBASE, RDGSBASE, WRFSBASE, and WRGSBASE. The intrinsics allow software that works in the 64-bit environment to read and write the FS base and GS base registers at all privileged levels.

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.