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327d0651f8
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Scott Michel 327d0651f8 This patch fixes a problem encountered by the CellSPU backend where variants 
were being pruned in patterns where a variable was used more than once, e.g.:

  (or (and R32C:$rA, R32C:$rC), (and R32C:$rB, (not R32C:$rC)))

In this example, $rC is used more than once and is actually significant to
instruction selection pattern matching when commuted variants are produced.
This patch scans the pattern's clauses and collects the variables, creating
a set of variables that are used more than once. TreePatternNode::isIsomorphicTo()
also understands that multiply-used variables are significant.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47950 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-05 17:49:05 +00:00
autoconf Use AC_PATH_PROG correctly: 2008-03-05 09:28:02 +00:00
bindings Fix a typo noticed by Erick Tryzelaar, 2008-03-04 14:52:05 +00:00
docs update to document new lto API 2008-02-29 19:34:52 +00:00
examples remove attributions from examples. 2007-12-29 20:37:57 +00:00
include Add a target lowering hook to control whether it's worthwhile to compress fp constant. 2008-03-05 01:30:59 +00:00
lib evan implemented this. 2008-03-05 17:11:51 +00:00
projects remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
runtime Fixing the stack walker. 2008-01-24 05:16:36 +00:00
test Fix test not to emit junk into source directory 2008-03-05 15:44:25 +00:00
tools Renable lto2 build. 2008-03-03 17:32:40 +00:00
utils This patch fixes a problem encountered by the CellSPU backend where variants 2008-03-05 17:49:05 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 Unbreak build for VC2008. Patch by Argiris Kirtzidis! 2008-02-22 10:11:21 +00:00
Xcode Rename CFEBuildInstrs.html to GCCFEBuildInstrs.html. 2008-02-14 17:53:22 +00:00
build-for-llvm-top.sh Allow the configure options to be set according to the llvm-top options. 2007-08-31 19:53:42 +00:00
configure Use AC_PATH_PROG correctly: 2008-03-05 09:28:02 +00:00
CREDITS.TXT Update credits. 2007-12-11 09:32:07 +00:00
LICENSE.TXT scoped_ptr.h was removed. 2008-02-09 22:50:06 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile Run 'svn info' in the C locale. Also appropriately escape spaces and ? for gawk in darwin. 2008-02-28 18:46:56 +00:00
Makefile.common remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.config.in improve compatibility with mingw, patch by Alain Frisch 2008-01-15 22:50:50 +00:00
Makefile.rules Remove inappropriate whitespace, change CVS to SVN where it makes sense. 2008-02-27 13:34:15 +00:00
ModuleInfo.txt Update to include clean and install commands. 2007-07-20 20:54:41 +00:00
README.txt test 2007-04-20 20:49:25 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level 
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments. 

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the HTML documentation provided in docs/index.html for further
assistance with LLVM.