Developer Guide and Reference

Contents

_rdrand16_step()
,
_rdrand32_step()
,
_rdrand64_step()

Generate random numbers of 16/32/64 bit wide random integers. These intrinsics are mapped to the hardware instruction
RDRAND
.

Syntax

extern int _rdrand16_step(unsigned short *random_val);
extern int _rdrand32_step(unsigned int *random_val);
extern int _rdrand64_step(unsigned __int64 *random_val);
Description
These intrinsics generate random numbers of 16/32/64 bit wide random integers. The generated random value is written to the given memory location and the success status is returned: '
1
' if the hardware returned a valid random value, and '
0
' otherwise.
Returns
1 : if the hardware returns a 16/32/64 random value.
0 : if the hardware does not return any random value.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804