llvm-6502

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LLVM backend for 6502

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Chris Lattner cd81639d2e Fix a deficiency in the spiller that Evan noticed. In particular, consider this code: store [stack slot #0], R10 = add R14, [stack slot #0] The spiller didn't know that the store made the value of [stackslot#0] available in R10 IF the store came from a copy instruction with the store folded into it. This patch teaches VirtRegMap to look at these stores and recognize the values they make available. In one case Evan provided, this code: divsd %XMM0, %XMM1 movsd %XMM1, QWORD PTR [%ESP + 40] 1) movsd QWORD PTR [%ESP + 48], %XMM1 2) movsd %XMM1, QWORD PTR [%ESP + 48] addsd %XMM1, %XMM0 3) movsd QWORD PTR [%ESP + 48], %XMM1 movsd QWORD PTR [%ESP + 4], %XMM0 turns into: divsd %XMM0, %XMM1 movsd %XMM1, QWORD PTR [%ESP + 40] addsd %XMM1, %XMM0 3) movsd QWORD PTR [%ESP + 48], %XMM1 movsd QWORD PTR [%ESP + 4], %XMM0 In this case, instruction #2 was removed because of the value made available by #1, and inst #1 was later deleted because it is now never used before the stack slot is redefined by #3. This occurs here and there in a lot of code with high spilling, on PPC most of the removed loads/stores are LSU-reject-causing loads, which is nice. On X86, things are much better (because it spills more), where we nuke about 1% of the instructions from SMG2000 and several hundred from eon. More improvements to come... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25917 91177308-0d34-0410-b5e6-96231b3b80d8		2006-02-02 23:29:36 +00:00
autoconf	don't need this any more; the "#define hashes to trees" hack is coming	2006-01-23 06:47:56 +00:00
docs	Remove FAKE_SOURCES	2006-01-27 22:06:01 +00:00
examples	When a function takes a variable number of pointer arguments, with a zero	2005-10-23 04:37:20 +00:00
include/llvm	Move isLoadFrom/StoreToStackSlot from MRegisterInfo to TargetInstrInfo,	2006-02-02 20:11:55 +00:00
lib	Fix a deficiency in the spiller that Evan noticed. In particular, consider	2006-02-02 23:29:36 +00:00
projects	Fixed Makefile so it does, indeed, build a dynamic library.	2006-01-06 22:51:19 +00:00
runtime	fix make install/uninstall of libcrtend.	2006-01-30 02:03:56 +00:00
test	new testcase	2006-02-02 06:35:38 +00:00
tools	Pass plugins on to children when optimizing.	2006-01-26 18:37:21 +00:00
utils	add a note, ya knoe	2006-02-01 19:12:23 +00:00
win32	Add _CRT_SECURE_NO_DEPRECATE preprocessor symbol to make VS2005 happy.	2006-01-30 04:07:08 +00:00
Xcode	Catch up on some of the file addition/deletions.	2006-01-27 13:24:20 +00:00
.cvsignore	Ignore the configure.out file generated by "make reconfigure"	2005-06-18 23:01:25 +00:00
configure	Update for including additional function tests.	2006-01-23 08:15:53 +00:00
CREDITS.TXT	Add an entry	2006-01-08 08:25:38 +00:00
LICENSE.TXT	Happy New Year, LLVM.	2006-01-03 14:42:06 +00:00
llvm.spec	Onward to LLVM-1.6 and beyond!	2005-05-18 20:23:20 +00:00
llvm.spec.in	Onward to LLVM-1.6 and beyond!	2005-05-18 20:23:20 +00:00
Makefile	For PR614:	2005-08-25 04:59:49 +00:00
Makefile.common	Update comments to reflect new variable names. Patch contributed by	2005-02-14 16:02:19 +00:00
Makefile.config.in	Implement fix for PR471:	2005-12-21 03:31:53 +00:00
Makefile.rules	* Eliminate FAKE_SOURCES	2006-01-27 22:13:12 +00:00
README.txt	Make the text of this file a little more useful.	2004-09-02 22:49:27 +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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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.