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Dan Gohman d692070372 When the coalescer is doing rematerializing, have it remove 
the copy instruction from the instruction list before asking the
target to create the new instruction. This gets the old instruction
out of the way so that it doesn't interfere with the target's
rematerialization code. In the case of x86, this helps it find
more cases where EFLAGS is not live.

Also, in the X86InstrInfo.cpp, teach isSafeToClobberEFLAGS to check
to see if it reached the end of the block after scanning each
instruction, instead of just before. This lets it notice when the
end of the block is only two instructions away, without doing any
additional scanning.

These changes allow rematerialization to clobber EFLAGS in more
cases, for example using xor instead of mov to set the return value
to zero in the included testcase.

llvm-svn: 57872
2008-10-21 03:24:31 +00:00
autoconf Fix configure issue where configure 2008-10-07 22:21:03 +00:00
bindings PR2731: C and Ocaml bindings for setTailCall and isTailCall. 2008-08-30 16:34:54 +00:00
cmake CMake: Builds all targets. 2008-09-26 04:40:32 +00:00
docs Fix spelling error. 2008-10-20 08:45:34 +00:00
examples CMake: Builds all examples. Corrected name of CBackend target. 2008-09-26 19:48:03 +00:00
include Add skeleton for the pre-register allocation live interval splitting pass. 2008-10-20 21:44:59 +00:00
lib When the coalescer is doing rematerializing, have it remove 2008-10-21 03:24:31 +00:00
projects Add "sample" documentation to sample project. 2008-09-15 05:31:29 +00:00
runtime Fixing the stack walker. 2008-01-24 05:16:36 +00:00
test When the coalescer is doing rematerializing, have it remove 2008-10-21 03:24:31 +00:00
tools Re-apply Makefile changes. Fix build with srcdir != objdir. 2008-10-16 14:02:29 +00:00
utils Add RCBarriers to TargetInstrDesc. It's a list of register classes the given instruction can "clobber". For example, on x86 the call instruction can modify all of the XMM and fp stack registers. 2008-10-17 21:00:09 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 update win32 project file, patch provided by OvermindDL1 on llvmdev. 2008-10-11 22:14:59 +00:00
Xcode Remove Stacker.html from Xcode project. 2008-10-14 23:23:59 +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
CMakeLists.txt Fun x86 encoding tricks: when adding an immediate value of 128, 2008-10-17 01:33:43 +00:00
configure Fix configure issue where configure 2008-10-07 22:21:03 +00:00
CREDITS.TXT Add another description to my entry. 2008-08-28 23:16:37 +00:00
LICENSE.TXT llvmc doesn't exist anymore, and llvmc2 doesn't have a special license file. 2008-06-20 20:05:57 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile Add support for Canadian Cross builds where the host executables are not 2008-10-02 22:56:44 +00:00
Makefile.common remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.config.in Add support for Canadian Cross builds where the host executables are not 2008-10-02 22:56:44 +00:00
Makefile.rules Fun x86 encoding tricks: when adding an immediate value of 128, 2008-10-17 01:33:43 +00:00
ModuleInfo.txt Update to include clean and install commands. 2007-07-20 20:54:41 +00:00
README.txt Remove extra lines 2008-07-28 20:50:25 +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.