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| author | Stephen Hines <srhines@google.com> | 2014-04-23 16:57:46 -0700 |
|---|---|---|
| committer | Stephen Hines <srhines@google.com> | 2014-04-24 15:53:16 -0700 |
| commit | 36b56886974eae4f9c5ebc96befd3e7bfe5de338 (patch) | |
| tree | e6cfb69fbbd937f450eeb83bfb83b9da3b01275a /docs/Vectorizers.rst | |
| parent | 69a8640022b04415ae9fac62f8ab090601d8f889 (diff) | |
| download | external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.zip external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.gz external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.bz2 | |
Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
Diffstat (limited to 'docs/Vectorizers.rst')
| -rw-r--r-- | docs/Vectorizers.rst | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/Vectorizers.rst b/docs/Vectorizers.rst index 61ebca2..887ccaa 100644 --- a/docs/Vectorizers.rst +++ b/docs/Vectorizers.rst @@ -182,11 +182,14 @@ that scatter/gathers memory. .. code-block:: c++ - int foo(int *A, int *B, int n, int k) { - for (int i = 0; i < n; ++i) - A[i*7] += B[i*k]; + int foo(int * A, int * B, int n) { + for (intptr_t i = 0; i < n; ++i) + A[i] += B[i * 4]; } +In many situations the cost model will inform LLVM that this is not beneficial +and LLVM will only vectorize such code if forced with "-mllvm -force-vector-width=#". + Vectorization of Mixed Types ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |