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Example code for gettings started with library #122

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7030af3
Update gitignore to include object codes and executables
sahmad98 May 19, 2018
2e5c046
Example for vector addition of two arrays
sahmad98 May 19, 2018
b371681
Update vector-add.cpp
sahmad98 Jul 22, 2019
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2 changes: 2 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -12,3 +12,5 @@ libsimdpp.files
build*
venv
pywiki
*.o
*.out
6 changes: 6 additions & 0 deletions examples/Makefile
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CXXFLAGS = -std=c++11 -I../ -lstdc++

all: vector-add

vector-add:
g++ $(CXXFLAGS) -DSIMDPP_ARCH_X86_SSE4_1 -msse4 vector-add.cpp
36 changes: 36 additions & 0 deletions examples/vector-add.cpp
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#include <simdpp/simd.h>
#include <iostream>

// Initializes vector to store values
void init_vector(float* a, float* b, size_t size) {
for (int i=0; i<size; i++) {
a[i] = i;
b[i] = size - i - 1;
}
}

// Test result of SIMD operations on vector
void test_result(float* result, size_t size) {
for (int i=0; i<size; i++) {
assert(result[i] == size - 1);
}
}

using namespace simdpp;
int main() {
const size_t SIZE = 1024;
float vec_a[SIZE];
float vec_b[SIZE];
float result[SIZE];
init_vector(vec_a, vec_b, SIZE);

for (int i=0; i<SIZE; i+=4) {
float32<4> xmmA = load(vec_a + i); //loads 4 floats into xmmA
float32<4> xmmB = load(vec_b + i); //loads 4 floats into xmmB
float32<4> xmmC = add(xmmA, xmmB); //Vector add of xmmA and xmmB
store(result + i, xmmC); //Store result into the vector
}

test_result(result, SIZE);
return 0;
}