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Expand a little on the description of what InstructionSimplify does.

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llvm-svn: 120016
This commit is contained in:
Duncan Sands 2010-11-23 10:50:08 +00:00
parent 809b3e3634
commit 97ada840ed
2 changed files with 9 additions and 5 deletions
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8
include/llvm/Analysis/InstructionSimplify.h
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@ -7,9 +7,11 @@
//
//===----------------------------------------------------------------------===//
//
// This file declares routines for folding instructions into simpler forms that
// do not require creating new instructions. For example, this does constant
// folding, and can handle identities like (X&0)->0.
// This file declares routines for folding instructions into simpler forms
// that do not require creating new instructions. This does constant folding
// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
// ("and i32 %x, %x" -> "%x").
//
//===----------------------------------------------------------------------===//

6
lib/Analysis/InstructionSimplify.cpp
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@ -8,8 +8,10 @@
//===----------------------------------------------------------------------===//
//
// This file implements routines for folding instructions into simpler forms
// that do not require creating new instructions. For example, this does
// constant folding, and can handle identities like (X&0)->0.
// that do not require creating new instructions. This does constant folding
// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
// ("and i32 %x, %x" -> "%x").
//
//===----------------------------------------------------------------------===//