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# Yeppp! F.A.Q

## What is Yeppp!?

Yeppp! is a high-performance SIMD-optimized mathematical library for x86, ARM, PowerPC, and MIPS processors on Windows, Android, Mac OS X, and GNU/Linux systems. Yeppp! contains versions of its functions for multiple architectures and instruction sets and chooses the optimal implementation during initialization to guarantee the best performance on the host machine.

## Which vector operations are supported?

Yeppp! aims to provide an orthogonal set of vector operations. By *orthogonal* we mean that Yeppp! supports all possible variations of operands. For example, for subtraction Yeppp! has 7 variants:

- Subtraction of two arrays (z[i] := x[i] - y[i])
- Subtraction of constant from array (z[i] := x[i] - c)
- Subtraction of array from constant (z[i] := c - x[i])
- In-place subtraction of two arrays, overwrite first array (x[i] := x[i] - y[i])
- In-place subtraction of two arrays, overwrite second array (y[i] := x[i] - y[i])
- In-place subtraction of constant from array (x[i] := x[i] - c)
- In-place subtraction of array from constant (x[i] := c - x[i])

Moreover, there is a complete set of the above functions for different data types:

- 8-bit, 16-bit, 32-bit, and 64-bit integers (signed and unsigned)
- Single precision (32-bit) and double precision (64-bit) floating-point numbers

Besides basic arithmetic operations (addition, subtraction, multiplication) Yeppp! provides high-performance mathematical functions, such as *log*, *exp*, *sin*, which operate on vectors.

## What other functionality is supported?

Yeppp! provides a number of functions to retrieve information about the processor (supported instruction extensions, architecture and microarchitecture, canonical processor name), measure processor cycles, access high-performance system timer, and processor energy counters.

## Do I have to write in C++ to use Yeppp?

No. Yeppp! functions can be called from C, C++, C#, Java, FORTRAN.

## Which architectures and operating systems are supported?

As of Yeppp! 1.0.1, the library supports 15 platforms:

- Windows on x86 (32-bit) architecture
- Windows on x86-64 (64-bit) architecture
- Mac OS X on x86 (Intel 32 bit) architecture
- Mac OS X on x86-64 (Intel 64 bit) architecture
- Linux on x86 architecture
- Linux on x86-64 architecture
- Linux on armel ABI (ARMv5T architecture, Soft-Float EABI)
- Linux on armhf ABI (ARMv7-A architecture, Hard-Float EABI)
- Linux on k1om architecture (Xeon Phi)
- Linux on PowerPC 64 architecture
- Linux on Blue Gene/Q architecture
- Android "armeabi" ABI (ARMv5TE architecture)
- Android "armeabi-v7a" ABI (ARMv7-A architecture)
- Android "x86" ABI
- Android "mips" ABI

## What is the license?

Yeppp! is licensed under the New BSD license (AKA 3-clause BSD), an OSI-approved permissive open source license. In particular, the license allows you to

- Use Yeppp! in closed-source projects
- Distribute Yeppp! as a part of your commercial product
- Modify Yeppp! source code