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--- roberto.alfieri:pub:vectorization [13/06/2017 19:54] – roberto.alfieri
+++ roberto.alfieri:pub:vectorization [14/06/2017 11:30] (versione attuale) – roberto.alfieri
@@ Linea 1: / Linea 1: @@
 ====== Vectorization ======
+[[ http://www.training.prace-ri.eu/uploads/tx_pracetmo/intel_mic_optimization.pdf | Vectorization and Code Optimization ]]
 Processor peak performance includes the speed-up provided by the vector instructions,
@@ Linea 16: / Linea 19: @@
-Auto-vectorization is the easiest and more portable way to get vectorization , but not all loops can be vectorized:
+Auto-vectorization is the easiest and more portable way to get vectorization.
+The compiler recognize several vectiorization options.
+Main vectorization options:
+^     ^  Intel compiler   ^
+^ KNL      | -xMIC-AVX512  |
+^ BDW      | -xCORE-AVX2   |
+^ Disable  | -no-vec       |
+Not all loops can be vectorized:
 Some examples:
@@ Linea 35: / Linea 49: @@
       for (int i = 0; i < N; i++)   a[i] = foo(b[i]);
-  * Loops on data that are not aligned in the memory
+  * Loops on data that are not aligned in memory