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LLVM backend for 6502
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79590b8edf
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Evan Cheng 79590b8edf Instcombine was transforming: 
%shr = lshr i64 %key, 3
  %0 = load i64* %val, align 8
  %sub = add i64 %0, -1
  %and = and i64 %sub, %shr
  ret i64 %and

to:
  %shr = lshr i64 %key, 3
  %0 = load i64* %val, align 8
  %sub = add i64 %0, 2305843009213693951
  %and = and i64 %sub, %shr
  ret i64 %and

The demanded bit optimization is actually a pessimization because add -1 would
be codegen'ed as a sub 1. Teach the demanded constant shrinking optimization
to check for negated constant to make sure it is actually reducing the width
of the constant.

rdar://11793464


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160101 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-12 01:45:35 +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 Fixup broken doc link. Patch by Sean Silva <silvas@purdue.edu>. 2012-07-11 21:49:14 +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 Instcombine was transforming: 2012-07-12 01:45:35 +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 Instcombine was transforming: 2012-07-12 01:45:35 +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 Alphabetize. 2012-06-19 23:47:58 +00:00
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)
================================

This directory and its subdirectories contain source code for the Low Level
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the HTML documentation provided in docs/index.html for further
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If you're writing a package for LLVM, see docs/Packaging.html for our
suggestions.