avx512

问题 I'm currently writing some code targeting Intel's forthcoming AVX-512 SIMD instructions, which supports 512-bit operations. Now assuming there's a matrix represented by 16 SIMD registers, each holding 16 32-bit integers (corresponds to a row), how can I transpose the matrix with purely SIMD instructions? There're already solutions to transposing 4x4 or 8x8 matrices with SSE and AVX2 respectively. But I couldn't figure out how to extend it to 16x16 with AVX-512. Any ideas? 回答1: For two operand

问题 I'm currently writing some code targeting Intel's forthcoming AVX-512 SIMD instructions, which supports 512-bit operations. Now assuming there's a matrix represented by 16 SIMD registers, each holding 16 32-bit integers (corresponds to a row), how can I transpose the matrix with purely SIMD instructions? There're already solutions to transposing 4x4 or 8x8 matrices with SSE and AVX2 respectively. But I couldn't figure out how to extend it to 16x16 with AVX-512. Any ideas? 回答1: For two operand

问题 In designing forward looking algorithms for AVX256, AVX512 and one day AVX1024 and considering the potential implementation complexity/cost of fully generic permutes for large SIMD width I wondered if it is better to generally keep to isolated 128bit operations even within AVX512? Especially given that AVX had 128bit units to execute 256bit operations. To that end I wanted to know if there was a performance difference between AVX512 permute type operations across all of the 512bit vector as

问题 Assuming AVX2-targeted compilation and with C++ intrinsics, if I write an nbody algorithm using 17 registers per body-body computation, can 17th register be indirectly(register rename hardware) or directly(visual studio compiler, gcc compiler) be mapped on an AVX-512 register to cut memory dependency off? For example, skylake architecture has 1 or 2 AVX-512 fma units. Does this number change total registers available too? (specifically, a xeon silver 4114 cpu) If this works, how does it work?

问题 I'm trying to write some inline assembly code with KNC instructions for Xeon Phi platform, using the k1om-mpss-linux-gcc compiler. I want to use a mask register into my code in order to vectorize my computation. Here it is my code: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/time.h> #include <assert.h> #include <stdint.h> void* aligned_malloc(size_t size, size_t alignment) { uintptr_t r = (uintptr_t)malloc(size + --alignment + sizeof(uintptr_t)); uintptr_t t = r +

问题 I am new to use XeonPhi Intel co-processor. I want to write code for a simple Vector sum using AVX 512 bit instructions. I use k1om-mpss-linux-gcc as a compiler and want to write inline assembly. Here it is my code: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/time.h> #include <assert.h> #include <stdint.h> void* aligned_malloc(size_t size, size_t alignment) { uintptr_t r = (uintptr_t)malloc(size + --alignment + sizeof(uintptr_t)); uintptr_t t = r + sizeof(uintptr

问题 I am trying to learn AVX instructions and while running a basic code I recieve Illegal instruction (core dumped) The code is mentioned below and I am compiling it using g++ -mavx512f 1.cpp What exactly is the problem and how to overcome it? Thank You! #include <immintrin.h> #include<iostream> using namespace std; void add(const float a[], const float b[], float res[], int n) { int i = 0; for(; i < (n&(~0x31)) ; i+=32 ) { __m512 x = _mm512_loadu_ps( &a[i] ); __m512 y = _mm512_loadu_ps( &b[i] )

问题 $ make i have worked with cygwin but got compile error. I am not sure what is invalid register for .seh_savexmm please help me. I searched this problem on google but not find there are many problems but not soultion. Please help me. perl ./generate-functions.pl -file operationMetadata.csv g++ -std=c++14 -O3 -Wall -g -mavx512vl -mavx512f -mavx512pf -mavx512er -mavx512cd -fno-common -c int-test.c -o int-test.o g++ -std=c++14 -O3 -Wall -g -mavx512vl -mavx512f -mavx512pf -mavx512er -mavx512cd

问题 this is my code for 'strlen' function in AVX512BW vxorps zmm0, zmm0, zmm0 ; ZMM0 = 0 vpcmpeqb k0, zmm0, [ebx] ; ebx is string and it's aligned at 64-byte boundary kortestq k0, k0 ; 0x00 found ? jnz .chk_0x00 now for 'chk_0x00', in x86_64 systems, there is no problem and we can handle it like this: chk_0x00: kmovq rbx, k0 tzcnt rbx, rbx add rax, rbx here we have a 64-bit register so we can store the mask into it but my question is about x86 systems where we don't have any 64-bit register so we

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I'm trying to learn x86-64 's new AVX-512 instructions, but neither of my computers have support for them. I tried using various disassemblers (from Visual Studio to online ones: 1, 2) to see the instructions for specific opcode encodings, but I'm getting somewhat conflicting results. Plus, it would've been nice