From 97f70add3ca7005411a3ffc685ab81a50ab9382a Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Tue, 19 May 2009 20:37:36 +0000 Subject: [PATCH] Add some more comments to the top of this file. llvm-svn: 72131 --- llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 15b1506700cf..3a71d279772a 100644 --- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -7,8 +7,15 @@ // //===----------------------------------------------------------------------===// // +// This transformation analyzes and transforms the induction variables (and +// computations derived from them) into forms suitable for efficient execution +// on the target. +// // This pass performs a strength reduction on array references inside loops that -// have as one or more of their components the loop induction variable. +// have as one or more of their components the loop induction variable, it +// rewrites expressions to take advantage of scaled-index addressing modes +// available on the target, and it performs a variety of other optimizations +// related to loop induction variables. // //===----------------------------------------------------------------------===//