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3219c7fbe5
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Evan Cheng 3219c7fbe5 Part 1. 
- Change register allocation hint to a pair of unsigned integers. The hint type is zero (which means prefer the register specified as second part of the pair) or entirely target dependent.
- Allow targets to specify alternative register allocation orders based on allocation hint.

Part 2.
- Use the register allocation hint system to implement more aggressive load / store multiple formation.
- Aggressively form LDRD / STRD. These are formed *before* register allocation. It has to be done this way to shorten live interval of base and offset registers. e.g.
v1025 = LDR v1024, 0
v1026 = LDR v1024, 0
=>
v1025,v1026 = LDRD v1024, 0

If this transformation isn't done before allocation, v1024 will overlap v1025 which means it more difficult to allocate a register pair.

- Even with the register allocation hint, it may not be possible to get the desired allocation. In that case, the post-allocation load / store multiple pass must fix the ldrd / strd instructions. They can either become ldm / stm instructions or back to a pair of ldr / str instructions.

This is work in progress, not yet enabled.

llvm-svn: 73381
2009-06-15 08:28:29 +00:00
autoconf Add a flag to permit disabling libffi. 2009-06-06 06:24:44 +00:00
bindings Give embedded metadata its own type instead of relying on EmptyStructTy. 2009-05-30 05:06:04 +00:00
cmake CMake: New variable LLVM_LIBDIR_SUFFIX. 2009-06-12 02:49:53 +00:00
docs remove some old CVS-specific arguments that don't work with SVN. 2009-06-15 04:18:54 +00:00
examples silence a warning. 2009-04-15 00:16:05 +00:00
include Part 1. 2009-06-15 08:28:29 +00:00
lib Part 1. 2009-06-15 08:28:29 +00:00
projects Revert r67655 and r67656, as they are breaking the build. I'm 2009-03-25 00:52:11 +00:00
runtime Drop toy GC runtime. 2009-03-02 03:46:48 +00:00
test Part 1. 2009-06-15 08:28:29 +00:00
tools Bug fix: 2009-06-09 21:14:25 +00:00
unittests Reversed order of args in EXPECT_EQ() macros to be in the correct order: 2009-06-09 21:48:57 +00:00
utils Add output of the SFINAE bit for Clang's diagnostics 2009-06-14 07:24:49 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 Add a new codegen pass that normalizes dwarf exception handling 2009-05-22 20:36:31 +00:00
Xcode Remove Stacker.html from Xcode project. 2008-10-14 23:23:59 +00:00
build-for-llvm-top.sh Patch to build llvm with srcdir != objdir from 2009-01-23 08:42:38 +00:00
CMakeLists.txt CMake: New variable LLVM_LIBDIR_SUFFIX. 2009-06-12 02:49:53 +00:00
configure Regenerate. 2009-06-06 06:25:09 +00:00
CREDITS.TXT Add myself, test commit 2009-06-14 02:03:17 +00:00
LICENSE.TXT Now that we have atomics support properly detected by configure, 2009-05-19 00:08:29 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile Change 'make install' to install tblgen, for better support of out-of-tree targets, 2009-05-08 17:32:47 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in Add a --enable-profiling option to configure to build Debug+Profile and 2009-04-17 14:49:22 +00:00
Makefile.rules On platforms like Sparc64 you need to pass -r to 2009-06-05 15:05:19 +00:00
ModuleInfo.txt Patch to build llvm with srcdir != objdir from 2009-01-23 08:42:38 +00:00
README.txt README.txt: test commit w/blank line appended 2009-03-23 21:00:45 +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.