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Andrew Trick 64925c55c6 Enable LSR IV Chains with sufficient heuristics. 
These heuristics are sufficient for enabling IV chains by
default. Performance analysis has been done for i386, x86_64, and
thumbv7. The optimization is rarely important, but can significantly
speed up certain cases by eliminating spill code within the
loop. Unrolled loops are prime candidates for IV chains. In many
cases, the final code could still be improved with more target
specific optimization following LSR. The goal of this feature is for
LSR to make the best choice of induction variables.

Instruction selection may not completely take advantage of this
feature yet. As a result, there could be cases of slight code size
increase.

Code size can be worse on x86 because it doesn't support postincrement
addressing. In fact, when chains are formed, you may see redundant
address plus stride addition in the addressing mode. GenerateIVChains
tries to compensate for the common cases.

On ARM, code size increase can be mitigated by using postincrement
addressing, but downstream codegen currently misses some opportunities.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147826 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-10 01:45:08 +00:00
autoconf revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
bindings Update OCaml bindings for the new half float type. 2011-12-28 18:51:08 +00:00
cmake revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
docs Fix dead link 2012-01-07 04:11:27 +00:00
examples LLVMBuild: Remove trailing newline, which irked me. 2011-12-12 19:48:00 +00:00
include Enable LSR IV Chains with sufficient heuristics. 2012-01-10 01:45:08 +00:00
lib Enable LSR IV Chains with sufficient heuristics. 2012-01-10 01:45:08 +00:00
projects revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
runtime LLVMBuild: Remove trailing newline, which irked me. 2011-12-12 19:48:00 +00:00
test Enable LSR IV Chains with sufficient heuristics. 2012-01-10 01:45:08 +00:00
tools Remove the logging streamer. 2012-01-10 00:40:39 +00:00
unittests Undo the hack in r147427 and move this unittest to a better home. This 2012-01-02 09:19:48 +00:00
utils Use descriptive variable name and remove incorrect operand number check. 2012-01-09 21:30:46 +00:00
.gitignore git: Add tools/lldb to the ignore list. 2011-11-10 22:55:50 +00:00
CMakeLists.txt capitalize project name, reference bugzilla 2011-12-18 18:50:16 +00:00
configure revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
CREDITS.TXT CREDITS.TXT: Add a line. (test commit) 2011-10-29 23:42:14 +00:00
LICENSE.TXT Happy new year 2012! 2012-01-01 08:16:56 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile llvm-config: Replace with C++ version (was llvm-config-2). 2011-12-01 20:18:09 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in capitalize project name, reference bugzilla 2011-12-18 18:50:16 +00:00
Makefile.rules PR11642 has been fixed, enable -fvisibility-inlines-hidden everywhere. 2011-12-27 21:37:11 +00:00
README.txt Undo test commit 2011-11-22 20:05:48 +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.

If you're writing a package for LLVM, see docs/Packaging.html for our
suggestions.