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[Docs] Improve SLP code snippet 

New C code snippet is more viable for SLP vectorization in most architectures.

Patch by: @lsandov1 (Leonardo Sandoval)

Differential Revision: https://reviews.llvm.org/D70866
This commit is contained in:
Sanjay Patel 2019-12-09 17:07:30 -05:00
parent 1b2842bf90
commit a0c558ee4c
1 changed files with 4 additions and 2 deletions
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6
llvm/docs/Vectorizers.rst
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@ -418,8 +418,10 @@ into vector operations.
.. code-block:: c++
void foo(int a1, int a2, int b1, int b2, int *A) {
A[0] = a1*(a1 + b1)/b1 + 50*b1/a1;
A[1] = a2*(a2 + b2)/b2 + 50*b2/a2;
A[0] = a1*(a1 + b1);
A[1] = a2*(a2 + b2);
A[2] = a1*(a1 + b1);
A[3] = a2*(a2 + b2);
}
The SLP-vectorizer processes the code bottom-up, across basic blocks, in search of scalars to combine.