sse2rvv

A C/C++ header file that converts Intel SSE intrinsics to RISCV-V Extension intrinsics.

Introduction

sse2rvv is a translator of Intel SSE (Streaming SIMD Extensions) intrinsics to RISCV-V Extension, shortening the time needed to get an RISCV working program that then can be used to extract profiles and to identify hot paths in the code. The header file sse2rvv.h contains several of the functions provided by Intel intrinsic headers such as <xmmintrin.h>, only implemented with RISCV-based counterparts to produce the exact semantics of the intrinsics.

This project is based on sse2neon, and modify it to RISCV version.

Mapping and Coverage

Header file	Extension
<mmintrin.h>	MMX
<xmmintrin.h>	SSE
<emmintrin.h>	SSE2
<pmmintrin.h>	SSE3
<tmmintrin.h>	SSSE3
<smmintrin.h>	SSE4.1
<nmmintrin.h>	SSE4.2
<wmmintrin.h>	AES

sse2rvv aims to support SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 and AES extension.

In order to deliver RVV-equivalent intrinsics for all SSE intrinsics used widely, please be aware that some SSE intrinsics exist a direct mapping with a concrete RVV-equivalent intrinsic. Others, unfortunately, lack a 1:1 mapping, meaning that their equivalents are built utilizing a number of RVV intrinsics.

For example, SSE intrinsic _mm_add_epi16 has a direct RVV mapping (__riscv_vadd_vv_i16m1), but SSE intrinsic _mm_maddubs_epi16 has to be implemented with multiple RVV instructions.

Floating-point compatibility

Some conversions require several RVV intrinsics, which may produce inconsistent results compared to their SSE counterparts due to differences in the arithmetic rules of IEEE-754.

Usage

• Put the file sse2rvv.h in to your source code directory.

• Locate the following SSE header files included in the code:

#include <xmmintrin.h>
#include <emmintrin.h>

{p,t,s,n,w}mmintrin.h could be replaceable as well.

• Replace them with:

#include "sse2rvv.h"

• Explicitly specify platform-specific options to gcc/clang compilers.
  • On riscv64

  -march=r64gcv_zba

Run Built-in Test Suite

sse2rvv provides a unified interface for developing test cases. These test cases are located in tests directory, and the input data is specified at runtime. Use the following commands to perform test cases:

$ make test

Reference

• sse2neon
• neon2rvv
• Intel Intrinsics Guide
• Microsoft: x86 intrinsics list
• riscv-v-spec
• rvv-intrinsic-doc
• riscv-c-api

Licensing

sse2rvv is freely redistributable under the MIT License.