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LLVM backend for 6502
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Evan Cheng 875913439c InstrEmitter::EmitSubregNode() optimize extract_subreg in this case: 
r1025 = s/zext r1024, 4
r1026 = extract_subreg r1025, 4

to a copy:
r1026 = copy r1024

This is correct. However it uses TII->isCoalescableExtInstr() which can return
true for instructions which essentially does a sext_in_reg so this can end up
with an illegal copy where the source and destination register classes do not
match. Add a check to avoid it. Sorry, no test case possible at this time.

rdar://11849816


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160059 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-11 18:55:07 +00:00
autoconf Remove autoconf support for runtest and tclsh, some of the last vestigal 2012-06-27 23:53:41 +00:00
bindings
cmake LLVMConfig.cmake.in: Quote around @LLVM_INSTALL_PREFIX@, or it would not accept whitespace paths. 2012-07-07 03:12:28 +00:00
docs Since SmallMap was removed in r158644, remove documentation in ProgrammersManual.html. 2012-07-06 23:06:47 +00:00
examples Move llvm/Support/IRBuilder.h -> llvm/IRBuilder.h 2012-06-29 12:38:19 +00:00
include Teach the LiveInterval::join function to use the fast merge algorithm, 2012-07-10 22:25:21 +00:00
lib InstrEmitter::EmitSubregNode() optimize extract_subreg in this case: 2012-07-11 18:55:07 +00:00
projects Remove 'check-dg', a wrapper around 'check-local-dg' which was just 2012-06-28 00:03:13 +00:00
runtime
test PR13326: Fix a subtle edge case in the udiv -> magic multiply generator. 2012-07-11 18:31:59 +00:00
tools Target option DisableJumpTables is a gross hack. Move it to TargetLowering instead. 2012-07-02 22:39:56 +00:00
unittests Revert "IntRange:" as it appears to be breaking self hosting. 2012-07-02 23:22:21 +00:00
utils Machine model: allow itineraries to be shared by different processor models. 2012-07-09 20:43:03 +00:00
.gitignore
CMakeLists.txt Hoist LLVM's lit testsuite infrastructure into module so that it can be 2012-06-30 10:14:14 +00:00
configure Regenerate. 2012-06-28 20:35:00 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Remove autoconf support for runtest and tclsh, some of the last vestigal 2012-06-27 23:53:41 +00:00
Makefile.rules Remove 'check-dg', a wrapper around 'check-local-dg' which was just 2012-06-28 00:03:13 +00:00
README.txt test commit 2012-07-11 17:34:12 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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