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docs: ASCII-fy

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170637 91177308-0d34-0410-b5e6-96231b3b80d8
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Sean Silva
2012-12-20 02:23:25 +00:00
parent d3071bb042
commit 68d5b27b36
1 changed files with 3 additions and 3 deletions
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docs/Vectorizers.rst
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@@ -15,7 +15,7 @@ The Loop Vectorizer
Usage Usage
^^^^^^ ^^^^^^
LLVM’s Loop Vectorizer is now available and will be useful for many people. LLVM's Loop Vectorizer is now available and will be useful for many people.
It is not enabled by default, but can be enabled through clang using the It is not enabled by default, but can be enabled through clang using the
command line flag: command line flag:
@@ -41,7 +41,7 @@ Loops with unknown trip count
The Loop Vectorizer supports loops with an unknown trip count. The Loop Vectorizer supports loops with an unknown trip count.
In the loop below, the iteration ``start`` and ``finish`` points are unknown, In the loop below, the iteration ``start`` and ``finish`` points are unknown,
and the Loop Vectorizer has a mechanism to vectorize loops that do not start and the Loop Vectorizer has a mechanism to vectorize loops that do not start
at zero. In this example, ‘n’ may not be a multiple of the vector width, and at zero. In this example, 'n' may not be a multiple of the vector width, and
the vectorizer has to execute the last few iterations as scalar code. Keeping the vectorizer has to execute the last few iterations as scalar code. Keeping
a scalar copy of the loop increases the code size. a scalar copy of the loop increases the code size.
@@ -79,7 +79,7 @@ Reductions
In this example the ``sum`` variable is used by consecutive iterations of In this example the ``sum`` variable is used by consecutive iterations of
the loop. Normally, this would prevent vectorization, but the vectorizer can the loop. Normally, this would prevent vectorization, but the vectorizer can
detect that ‘sum’ is a reduction variable. The variable ‘sum’ becomes a vector detect that 'sum' is a reduction variable. The variable 'sum' becomes a vector
of integers, and at the end of the loop the elements of the array are added of integers, and at the end of the loop the elements of the array are added
together to create the correct result. We support a number of different together to create the correct result. We support a number of different
reduction operations, such as addition, multiplication, XOR, AND and OR. reduction operations, such as addition, multiplication, XOR, AND and OR.