getisax - extract valid instruction set extensions
#include <sys/auxv.h> uint_t getisax(uint32_t * array, uint_t n);
The getisax() function sets the vector array of n 32–bit integers to contain the bits from the AV_xxx_ yyy namespace of the given instruction set architecture.
Values for AV_xxx_ yyy for SPARC and SPARCV9, and their associated descriptions, can be found in sys/auxv_SPARC.h.
Values for AV_xxx_ yyy for i386 and AMD64, and their associated descriptions, can be found in sys/auxv_386.h.
The getisax() function returns the number of array elements that contain non-zero values.
In the following example, if the message is written, the SSE2 instruction set is present and fully supported by the operating system.
uint_t ui; (void) getisax(&ui, 1); if (ui & AV_386_SSE2) printf("SSE2 instruction set extension is present.\n");
See attributes(5) for descriptions of the following attributes: