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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278598 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aditya Kumar 2016-08-13 11:56:50 +00:00
parent c819da39b5
commit 3ee4558631
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Scalar/GVNHoist.cpp
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@ -9,8 +9,10 @@
//
// This pass hoists expressions from branches to a common dominator. It uses
// GVN (global value numbering) to discover expressions computing the same
// values. The primary goal is to reduce the code size, and in some
// cases reduce critical path (by exposing more ILP).
// values. The primary goals of code-hoisting are:
// 1. To reduce the code size.
// 2. In some cases reduce critical path (by exposing more ILP).
//
// Hoisting may affect the performance in some cases. To mitigate that, hoisting
// is disabled in the following cases.
// 1. Scalars across calls.