VectorCamp / simd-examples

Simple SIMD examples for training purposes

simd-examples

Simple SIMD examples for training purposes

TODO

Add makefile

Examples

average_sse.c

Calculates the average of N values in scalar and using SSE on x86

$ gcc -O3 average_sse.c -o average_sse

$ ./average_sse
updated diff1 tv_sec:2 tv_usec:151147
updated diff2 tv_sec:1 tv_usec:337442
average of 1073741824 elements = 16777216.000000 (scalar), 16777216.000000 (SSE)
scalar: 2 sec, usec: 151147
SSE: 1 sec, usec: 337442

average_avx2.c

Calculates the average of N values in scalar and using AVX2 on x86

$ gcc -mavx2 -O3 average_avx2.c -o average_avx2

$ ./average_avx2 
updated diff1 tv_sec:2 tv_usec:549127
average of 1073741824 elements = 16777216.000000 (scalar), 16777216.000000 (AVX2)
scalar: 2 sec, usec: 549127
avx2   : 1 sec, usec: 337110

average_avx512.c

Calculates the average of N values in scalar and using AVX512 on x86

$ gcc -mavx512f -O3 average_avx512.c -o average_avx512

$ ./average_avx512
updated diff1 tv_sec:2 tv_usec:550474
average of 1073741824 elements = 16777216.000000 (scalar), 16777216.000000 (AVX512)
scalar: 2 sec, usec: 550474
avx512   : 1 sec, usec: 336621