From abafaba4d546352d37f8ccae895b0234b6c735f2 Mon Sep 17 00:00:00 2001 From: Renato Golin Date: Sat, 23 Feb 2013 13:25:41 +0000 Subject: [PATCH] Add global structure vectorization to docs git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175965 91177308-0d34-0410-b5e6-96231b3b80d8 --- docs/Vectorizers.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/docs/Vectorizers.rst b/docs/Vectorizers.rst index 07486347e37..0894b1eb3f1 100644 --- a/docs/Vectorizers.rst +++ b/docs/Vectorizers.rst @@ -206,6 +206,25 @@ vectorization is profitable. 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 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -- 2.34.1