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man pages section 2: System Calls

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Updated: Thursday, June 13, 2019
 
 

getisax (2)

Name

getisax - extract valid instruction set extensions

Synopsis

#include <sys/auxv.h>

uint_t getisax(uint32_t *
array, uint_t n);

Description

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.

Return Values

The getisax() function returns the maximum number of array elements that contain non-zero values. This may be more than 'n'. The value n may be zero and array may be NULL, in which case the number of array elements will be returned and array will not be accessed.

Examples

Example 1 Use getisax() to determine if the SSE2 instruction set is present.

In the following example, if the message is written, the SSE2 instruction set is present and fully supported by the operating system.

uint_t n = getisax(NULL, 0);
uint_t *ui = calloc(n, sizeof(uint_t));
(void) getisax(ui, n);
if (ui[AV_HW1_IDX] & AV_386_SSE2) {
    printf("SSE2 instruction set extension is present.\n");
}

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
MT-Level
Safe

See Also

isainfo(1), ld(1), pargs(1), attributes(7)

Oracle Solaris 11.4 Linkers and Libraries Guide