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Brag about function call vectorization in the docs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176292 91177308-0d34-0410-b5e6-96231b3b80d8
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Benjamin Kramer 2013-02-28 19:33:46 +00:00
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docs/Vectorizers.rst
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@ -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
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^