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Jakob Stoklund Olesen 1a988004db Use a new strategy for preventing eviction loops in RAGreedy. 
Every live range is assigned a cascade number the first time it is
involved in an eviction. As the evictor, it gets a new cascade number.
Every evictee is assigned the same cascade number as the evictor.

Eviction is prohibited if the evictor has a lower assigned cascade
number than the evictee.

This means that assigned cascade numbers are monotonically increasing
with every eviction, yet they are bounded by NextCascade which can only
be incremented by new live ranges. Thus, infinite loops cannot happen,
but eviction cascades can still be triggered by new live ranges as we
want.

Thanks to Andy for explaining this to me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134303 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-02 01:37:09 +00:00
autoconf Add initial *-*-rtems* target, from Joel Sherrill 2011-07-01 22:41:06 +00:00
bindings
cmake Update CMake library dependencies. 2011-06-25 02:10:19 +00:00
docs Generalize @llvm.ctlz, @llvm.cttz, and @llvm.ctpop to work on vectors of integers, and fix the one optimization pass that I'm aware of that needs updating for this. At least one current target, ARM NEON, can implement these operations on vectors directly. 2011-07-01 21:52:38 +00:00
examples Modify comment. 2011-06-09 20:11:46 +00:00
include Add getFeatureBits to extract feature bits for a given CPU. 2011-07-02 00:43:44 +00:00
lib Use a new strategy for preventing eviction loops in RAGreedy. 2011-07-02 01:37:09 +00:00
projects
runtime Fix build for (some versions of?) MinGW. Patch by Ruben Van Boxem. 2011-06-23 18:24:27 +00:00
test TargetConstant immediates won't be placed into registers so tighten 2011-07-01 23:04:38 +00:00
tools Fix the ridiculous SubtargetFeatures API where it implicitly expects CPU name to 2011-06-30 01:53:36 +00:00
unittests Fix the implementation of ConstantRange::sub(ConstantRange). Patch by Xi Wang! 2011-06-22 21:13:46 +00:00
utils Rename TargetSubtarget to TargetSubtargetInfo for consistency. 2011-07-01 21:01:15 +00:00
website
.gitignore Ignore Vim swap files 2011-05-31 21:54:28 +00:00
build-for-llvm-top.sh
CMakeLists.txt Rename profile_rt.so to libprofile_rt.so under configure+make (it already was 2011-04-29 02:12:06 +00:00
configure Add initial *-*-rtems* target, from Joel Sherrill 2011-07-01 22:41:06 +00:00
CREDITS.TXT
LICENSE.TXT Happy new year. 2011-06-12 15:26:54 +00:00
llvm.spec.in
Makefile Install libprofile_rt.dylib where it's more available for gcov support. 2011-06-10 21:47:14 +00:00
Makefile.common
Makefile.config.in build/configure: Add support for --with-extra-ld-options flag (to provide extra 2011-06-16 22:30:38 +00:00
Makefile.rules Rename XXXGenSubtarget.inc to XXXGenSubtargetInfo.inc for consistency. 2011-07-01 22:36:09 +00:00
ModuleInfo.txt
README.txt reverting test commit 2011-05-12 17:38:08 +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,
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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
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If you're writing a package for LLVM, see docs/Packaging.html for our
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