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Update comments and documentation to reflect that GCSE and ValueNumbering are

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deprecated by the GVN and GVNPRE passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51983 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthijs Kooijman 2008-06-05 07:55:49 +00:00
parent 67944fc427
commit 845f524c25
5 changed files with 34 additions and 3 deletions
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22
docs/Passes.html
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@ -298,7 +298,7 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if !
<!-------------------------------------------------------------------------- -->
<div class="doc_subsection">
<a name="basicvn">Basic Value Numbering (default GVN impl)</a>
<a name="basicvn">Basic Value Numbering (default Value Numbering impl)</a>
</div>
<div class="doc_text">
<p>
@ -307,6 +307,12 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if !
lexically identical expressions. This does not require any ahead of time
analysis, so it is a very fast default implementation.
</p>
<p>
The ValueNumbering analysis passes are mostly deprecated. They are only used
by the <a href="#gcse">Global Common Subexpression Elimination pass</a>, which
is deprecated by the <a href="#gvn">Global Value Numbering pass</a> (which
does its value numbering on its own).
</p>
</div>
<!-------------------------------------------------------------------------- -->
@ -859,9 +865,13 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if !
<p>
This pass is designed to be a very quick global transformation that
eliminates global common subexpressions from a function. It does this by
using an existing value numbering implementation to identify the common
using an existing value numbering analysis pass to identify the common
subexpressions, eliminating them when possible.
</p>
<p>
This pass is deprecated by the <a href="#gvn">Global Value Numbering pass</a>
(which does a better job with its own value numbering).
</p>
</div>
<!-------------------------------------------------------------------------- -->
@ -899,6 +909,10 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if !
This pass performs global value numbering to eliminate fully redundant
instructions. It also performs simple dead load elimination.
</p>
<p>
Note that this pass does the value numbering itself, it does not use the
ValueNumbering analysis passes.
</p>
</div>
<!-------------------------------------------------------------------------- -->
@ -916,6 +930,10 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if !
live ranges, and should be used with caution on platforms that are very
sensitive to register pressure.
</p>
<p>
Note that this pass does the value numbering itself, it does not use the
ValueNumbering analysis passes.
</p>
</div>
<!-------------------------------------------------------------------------- -->

4
lib/Analysis/ValueNumbering.cpp
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@ -10,6 +10,10 @@
// This file implements the non-abstract Value Numbering methods as well as a
// default implementation for the analysis group.
//
// The ValueNumbering analysis pass is mostly deprecated. It is only used by the
// Global Common Subexpression Elimination pass, which is deprecated by the
// Global Value Numbering pass (which does its value numbering on its own).
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"

5
lib/Transforms/Scalar/GCSE.cpp
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@ -9,9 +9,12 @@
//
// This pass is designed to be a very quick global transformation that
// eliminates global common subexpressions from a function. It does this by
// using an existing value numbering implementation to identify the common
// using an existing value numbering analysis pass to identify the common
// subexpressions, eliminating them when possible.
//
// This pass is deprecated by the Global Value Numbering pass (which does a
// better job with its own value numbering).
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "gcse"

3
lib/Transforms/Scalar/GVN.cpp
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@ -10,6 +10,9 @@
// This pass performs global value numbering to eliminate fully redundant
// instructions. It also performs simple dead load elimination.
//
// Note that this pass does the value numbering itself, it does not use the
// ValueNumbering analysis passes.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "gvn"

3
lib/Transforms/Scalar/GVNPRE.cpp
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@ -16,6 +16,9 @@
// live ranges, and should be used with caution on platforms that are very
// sensitive to register pressure.
//
// Note that this pass does the value numbering itself, it does not use the
// ValueNumbering analysis passes.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "gvnpre"