10-05-2010
... and we can pay attention to the most boring part the the flight, those "mostly useless" safety instructions!
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LEARN ABOUT SUNOS
getisax
getisax(2) System Calls 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 instruc-
tion set architecture.
Values for AV_xxx_yyy are as follows:
SPARC
AV_SPARC_MUL32 32x32-bit smul/umul is efficient
AV_SPARC_DIV32 32x32-bit sdiv/udiv is efficient
AV_SPARC_FSMULD fsmuld instruction is efficient
AV_SPARC_V8PLUS V9 instructions available to 32-bit apps
AV_SPARC_POPC popc instruction is efficient
AV_SPARC_VIS VIS instruction set is supported
AV_SPARC_VIS2 IS2 instruction set is supported
x86
AV_386_FPU x87-style floating point
AV_386_TSC rdtsc instruction
AV_386_CX8 cmpxchg8b instruction
AV_386_SEP sysenter and sysexit
AV_386_AMD_SYSC AMD's syscall and sysret
AV_386_CMOV conditional move instructions
AV_386_MMX MMX instructions
AV_386_AMD_MMX AMD's MMX instructions
AV_386_AMD_3DNow AMD's 3Dnow! instructions
AV_386_AMD_3DNowx AMD's 3Dnow! extended instructions
AV_386_FXSR fxsave and fxrstor
AV_386_SSE SSE instructions and regs
AV_386_SSE2 SSE2 instructions and regs
AV_386_PAUSE use pause instruction (in spin loops)
AV_386_SSE3 SSE3 instructions and regs
AV_386_MON monitor/mwait instructions
RETURN VALUES
The getisax() function returns the number of array elements that contain non-zero values.
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 supportred by the operating system.
uint_t ui;
(void) getisax(&ui, 1);
if (ui & AV_386_SSE2)
printf("SSE2 instruction set extension is present.
");
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Stable |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO
isainfo(1), ld(1), pargs(1), attributes(5)
Linker and Libraries Guide
SPARC Assembly Language Reference Manual
x86 Assembly Language Reference Manual
SunOS 5.10 4 Oct 2004 getisax(2)