Developer Reference

Contents

v?InvSqrt

Computes an inverse square root of vector elements.

Syntax

vsInvSqrt
(
n
,
a
,
y
)
;
vsInvSqrtI(n, a, inca, y, incy);
vmsInvSqrt
(
n
,
a
,
y
,
mode
)
;
vmsInvSqrtI(n, a, inca, y, incy, mode);
vdInvSqrt
(
n
,
a
,
y
)
;
vdInvSqrtI(n, a, inca, y, incy);
vmdInvSqrt
(
n
,
a
,
y
,
mode
)
;
vmdInvSqrtI(n, a, inca, y, incy, mode);
Include Files
  • mkl.h
Input Parameters
Name
Type
Description
n
const MKL_INT
Specifies the number of elements to be calculated.
a
const float*
for
vsInvSqrt
,
vmsInvSqrt
const double*
for
vdInvSqrt
,
vmdInvSqrt
Pointer to an array that contains the input vector
a
.
inca
,
incy
const MKL_INT
Specifies increments for the elements of
a
and
y
.
mode
const MKL_INT64
Overrides global VM mode setting for this function call. See
vmlSetMode
for possible values and their description.
Output Parameters
Name
Type
Description
y
float*
for
vsInvSqrt
,
vmsInvSqrt
double*
for
vdInvSqrt
,
vmdInvSqrt
Pointer to an array that contains the output vector
y
.
Description
The
v?InvSqrt
function computes an inverse square root of vector elements.
Special Values for Real Function
v?InvSqrt(x)
Argument
Result
VM Error Status
Exception
X < +0
QNAN
VML_STATUS_ERRDOM
INVALID
+0
+
VML_STATUS_SING
ZERODIVIDE
-0
-
VML_STATUS_SING
ZERODIVIDE
-
QNAN
VML_STATUS_ERRDOM
INVALID
+
+0
 
 
QNAN
QNAN
 
 
SNAN
QNAN
 
INVALID

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.