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Add global structure vectorization to docs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175965 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Renato Golin 2013-02-23 13:25:41 +00:00
parent 4ff470e608
commit abafaba4d5
1 changed files with 19 additions and 0 deletions
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docs/Vectorizers.rst
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@ -206,6 +206,25 @@ vectorization is profitable.
A[i] += 4 * B[i]; A[i] += 4 * B[i];
} }
Global Structures Alias Analysis
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Access to global structures can also be vectorized, with alias analysis being
used to make sure accesses don't alias. Run-time checks can also be added on
pointer access to structure members.
Many variations are supported, but some that rely on undefined behaviour being
ignored (as other compilers do) are still being left un-vectorized.
.. code-block:: c++
struct { int A[100], K, B[100]; } Foo;
int foo() {
for (int i = 0; i < 100; ++i)
Foo.A[i] = Foo.B[i] + 100;
}
Vectorization of function calls Vectorization of function calls
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^