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Evan Cheng 4784f1fc73 Add a bit IsUndef to MachineOperand. This indicates the def / use register operand is defined by an implicit_def. That means it can def / use any register and passes (e.g. register scavenger) can feel free to ignore them. 
The register allocator, when it allocates a register to a virtual register defined by an implicit_def, can allocate any physical register without worrying about overlapping live ranges. It should mark all of operands of the said virtual register so later passes will do the right thing.

This is not the best solution. But it should be a lot less fragile to having the scavenger try to track what is defined by implicit_def.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74518 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-30 08:49:04 +00:00
autoconf Add a configure test for pthread_getspecific, and use it when building ThreadLocal. 2009-06-25 23:10:26 +00:00
bindings Fix the Ocaml bindings for the ExecutionEngine: with the change to build 2009-06-24 21:09:18 +00:00
cmake Fix CMake checks for pthread_getspecific and pthread_rwlock_init, from Xerxes Ranby 2009-06-29 16:25:22 +00:00
docs got confused again 2009-06-30 06:27:54 +00:00
examples make sure that JIT examples link in their appropriate target. 2009-06-17 16:48:44 +00:00
include Add a bit IsUndef to MachineOperand. This indicates the def / use register operand is defined by an implicit_def. That means it can def / use any register and passes (e.g. register scavenger) can feel free to ignore them. 2009-06-30 08:49:04 +00:00
lib Add a bit IsUndef to MachineOperand. This indicates the def / use register operand is defined by an implicit_def. That means it can def / use any register and passes (e.g. register scavenger) can feel free to ignore them. 2009-06-30 08:49:04 +00:00
projects remove dead makefile flags. 2009-06-24 05:29:56 +00:00
runtime Drop toy GC runtime. 2009-03-02 03:46:48 +00:00
test Add a bit IsUndef to MachineOperand. This indicates the def / use register operand is defined by an implicit_def. That means it can def / use any register and passes (e.g. register scavenger) can feel free to ignore them. 2009-06-30 08:49:04 +00:00
tools llvm-mc: Accept relocatable expressions for .org, assignments, .byte, etc. 2009-06-30 02:10:03 +00:00
unittests Fix order of arguments to EXPECT_EQ 2009-06-29 19:57:24 +00:00
utils Normalize SourceMgr messages. 2009-06-30 00:49:23 +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 Start flushing out MCContext. 2009-06-23 22:01:43 +00:00
configure Add a configure test for pthread_getspecific, and use it when building ThreadLocal. 2009-06-25 23:10:26 +00:00
CREDITS.TXT Add myself to the list. 2009-06-23 17:03:23 +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 Introduce new headers whose inclusion forces linking and 2009-06-16 20:12:29 +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 Make dynamic LLVMC plugins work on Windows (finally!). 2009-06-29 03:09:15 +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.