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| -rw-r--r-- | docs/Vectorizers.rst | 11 |
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diff --git a/docs/Vectorizers.rst b/docs/Vectorizers.rst index 0894b1eb3f..e2d3667bc1 100644 --- a/docs/Vectorizers.rst +++ b/docs/Vectorizers.rst @@ -245,6 +245,17 @@ See the table below for a list of these functions. | | | fmuladd | +-----+-----+---------+ +The loop vectorizer knows about special instructions on the target and will +vectorize a loop containing a function call that maps to the instructions. For +example, the loop below will be vectorized on Intel x86 if the SSE4.1 roundps +instruction is available. + +.. code-block:: c++ + + void foo(float *f) { + for (int i = 0; i != 1024; ++i) + f[i] = floorf(f[i]); + } Partial unrolling during vectorization ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |