modf

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-ECEFE3BB-D144-413B-8483-EF62C5092518

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modf

Computes the element-wise truncated integral and remaining fractional parts of vector elements.

Description
API
Examples

Description

The modf(a) function computes a truncated integer value and the remaining fraction part for each vector element.

Argument	Result 1	Result 2
+0	+0	+0
-0	-0	-0
+	+	+0
-	-	-0
SNAN	QNAN	QNAN
QNAN	QNAN	QNAN

The modf function does not generate any errors.

API

Syntax

Buffer API

namespace oneapi::mkl::vm {

sycl::event modf(sycl::queue & exec_queue,
      std::int64_t n,
      sycl::buffer<T> & a,
      sycl::buffer<T> & y,
      sycl::buffer<T> & z,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

namespace oneapi::mkl::vm {

sycl::event modf(sycl::queue & exec_queue,
      sycl::buffer<T> & a,
      oneapi::mkl::slice sa,
      sycl::buffer<T> & y,
      oneapi::mkl::slice sy,
      sycl::buffer<T> & z,
      oneapi::mkl::slice sz,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

USM API

namespace oneapi::mkl::vm {

sycl::event modf(sycl::queue & exec_queue,
      std::int64_t n,
      T const * a,
      T * y,
      T * z,
      std::vector<sycl::event> const & depends = {},
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

namespace oneapi::mkl::vm {

sycl::event modf(sycl::queue & exec_queue,
      T const * a,
      oneapi::mkl::slice sa,
      T * y,
      oneapi::mkl::slice sy,
      T * z,
      oneapi::mkl::slice sz,
      std::vector<sycl::event> const & depends = {},
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

modf supports the following precisions and devices:

T	Devices supported
`sycl::half`	GPU
`_Float16`	CPU
`float`	CPU and GPU
`double`	CPU and GPU

Input Parameters

Buffer API

exec_queue: The queue where the routine will be executed.
n: Specifies the number of elements to be calculated.
a: The buffer containing the input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
sz: Slice selector for z. See Data Types for a description of the oneMKL slice type.
mode: Overrides the global VM mode setting for this function call. See set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.

USM API

exec_queue: The queue where the routine will be executed.
n: Specifies the number of elements to be calculated.
a: Pointer to the input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
sz: Slice selector for z. See Data Types for a description of the oneMKL slice type.
depends: Vector of dependent events (to wait for input data to be ready). This is an optional parameter. The default is an empty vector.
mode: Overrides the global VM mode setting for this function call. See the set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.

Output Parameters

Buffer API

y: The buffer containing the output vector for truncated integer values.
z: The buffer containing the output vector for remaining fraction parts.
return value (event): Computation end event.

USM API

y: Pointer to the output vector for truncated integer values.
z: Pointer to the output vector for remaining fraction parts.
return value (event): Computation end event.

Examples

An example of how to use modf can be found in the oneMKL installation directory, under:

share/doc/mkl/examples/sycl/vml/source/vmodf.cpp

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oneMKL - Data Parallel C++ Developer Reference

modf

Description

API

Examples