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LLVM backend for 6502
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Dan Gohman 707e018423 Drop ISD::MEMSET, ISD::MEMMOVE, and ISD::MEMCPY, which are not Legal 
on any current target and aren't optimized in DAGCombiner. Instead
of using intermediate nodes, expand the operations, choosing between
simple loads/stores, target-specific code, and library calls,
immediately.

Previously, the code to emit optimized code for these operations
was only used at initial SelectionDAG construction time; now it is
used at all times. This fixes some cases where rep;movs was being
used for small copies where simple loads/stores would be better.

This also cleans up code that checks for alignments less than 4;
let the targets make that decision instead of doing it in
target-independent code. This allows x86 to use rep;movs in
low-alignment cases.

Also, this fixes a bug that resulted in the use of rep;stos for
memsets of 0 with non-constant memory size when the alignment was
at least 4. It's better to use the library in this case, which
can be significantly faster when the size is large.

This also preserves more SourceValue information when memory
intrinsics are lowered into simple loads/stores.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49572 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-12 04:36:06 +00:00
autoconf
bindings Expose Function::viewCFG and Function::viewCFGOnly to bindings. 2008-03-31 16:22:09 +00:00
docs The Ada front-end from the LLVM 2.2 release 2008-04-11 13:24:43 +00:00
examples silence warning when assertions are disabled. 2008-04-08 05:49:09 +00:00
include Drop ISD::MEMSET, ISD::MEMMOVE, and ISD::MEMCPY, which are not Legal 2008-04-12 04:36:06 +00:00
lib Drop ISD::MEMSET, ISD::MEMMOVE, and ISD::MEMCPY, which are not Legal 2008-04-12 04:36:06 +00:00
projects
runtime
test Drop ISD::MEMSET, ISD::MEMMOVE, and ISD::MEMCPY, which are not Legal 2008-04-12 04:36:06 +00:00
tools Move memcpy / memset optimization pass after GVN. 2008-04-10 01:33:05 +00:00
utils Change llvm tools install location. 2008-04-11 17:45:39 +00:00
website
win32 Removed a deleted file from the VStudio System project. Also added custom build commands to engage 64 bit assembler for compilation callback on 64 bit configurations only. 2008-04-03 20:28:40 +00:00
Xcode Update project to reflect deleted files. 2008-03-23 16:49:47 +00:00
build-for-llvm-top.sh
configure
CREDITS.TXT Add Mikhail to credits file 2008-03-23 08:58:32 +00:00
LICENSE.TXT
llvm.spec.in
Makefile
Makefile.common
Makefile.config.in Reverting r48974. See PR2183 for details. 2008-03-31 16:46:23 +00:00
Makefile.rules
ModuleInfo.txt
README.txt

README.txt 

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

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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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