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fix typos in comments

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
2014-08-26 00:59:15 +00:00
parent 44b3a0b411
commit 18637beefe
1 changed files with 4 additions and 4 deletions
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8
lib/Transforms/Vectorize/LoopVectorize.cpp
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@@ -5436,13 +5436,13 @@ LoopVectorizationCostModel::selectUnrollFactor(bool OptForSize,
// -- The unroll heuristics -- // -- The unroll heuristics --
// We unroll the loop in order to expose ILP and reduce the loop overhead. // We unroll the loop in order to expose ILP and reduce the loop overhead.
// There are many micro-architectural considerations that we can't predict // There are many micro-architectural considerations that we can't predict
// at this level. For example frontend pressure (on decode or fetch) due to // at this level. For example, frontend pressure (on decode or fetch) due to
// code size, or the number and capabilities of the execution ports. // code size, or the number and capabilities of the execution ports.
// //
// We use the following heuristics to select the unroll factor: // We use the following heuristics to select the unroll factor:
// 1. If the code has reductions the we unroll in order to break the cross // 1. If the code has reductions, then we unroll in order to break the cross
// iteration dependency. // iteration dependency.
// 2. If the loop is really small then we unroll in order to reduce the loop // 2. If the loop is really small, then we unroll in order to reduce the loop
// overhead. // overhead.
// 3. We don't unroll if we think that we will spill registers to memory due // 3. We don't unroll if we think that we will spill registers to memory due
// to the increased register pressure. // to the increased register pressure.
@@ -5452,7 +5452,7 @@ LoopVectorizationCostModel::selectUnrollFactor(bool OptForSize,
if (UserUF != 0) if (UserUF != 0)
return UserUF; return UserUF;
// When we optimize for size we don't unroll. // When we optimize for size, we don't unroll.
if (OptForSize) if (OptForSize)
return 1; return 1;