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LLVM backend for 6502
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df14a04b5c
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Chris Lattner df14a04b5c Fix a problem that Nate noticed with LSR: 
When inserting code for an addrec expression with a non-unit stride, be
more careful where we insert the multiply.  In particular, insert the multiply
in the outermost loop we can, instead of the requested insertion point.

This allows LSR to notice the mul in the right loop, reducing it when it gets
to it.  This allows it to reduce the multiply, where before it missed it.

This happens quite a bit in the test suite, for example, eliminating 2
multiplies in art, 3 in ammp, 4 in apsi, reducing from 1050 multiplies to
910 muls in galgel (!), from 877 to 859 in applu, and 36 to 30 in bzip2.

This speeds up galgel from 16.45s to 16.01s, applu from 14.21 to 13.94s and
fourinarow from 66.67s to 63.48s.

This implements Transforms/LoopStrengthReduce/nested-reduce.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24102 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-30 06:24:33 +00:00
autoconf For PR619: 2005-08-24 10:43:10 +00:00
docs Fix <> in html 2005-10-29 07:08:19 +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 Remove the LowerConstantExpressionsPass pass 2005-10-29 05:32:20 +00:00
lib Fix a problem that Nate noticed with LSR: 2005-10-30 06:24:33 +00:00
projects unbreak the build again 2005-10-27 16:30:44 +00:00
runtime This was never updated for the project makefile changes 2005-10-18 18:50:26 +00:00
test new testcase 2005-10-30 05:14:02 +00:00
tools Move some constant folding code shared by Analysis and Transform passes 2005-10-27 15:54:34 +00:00
utils Revert an accidental commit. 2005-10-29 17:01:41 +00:00
win32 More files deleted. 2005-10-29 16:51:48 +00:00
Xcode Remove the lowerconstantexprs pass 2005-10-29 05:34:40 +00:00
.cvsignore Ignore the configure.out file generated by "make reconfigure" 2005-06-18 23:01:25 +00:00
configure For PR616: 2005-08-24 10:07:20 +00:00
CREDITS.TXT Add a note, people are responsible for requesting that they be added to the 2005-08-02 22:10:21 +00:00
LICENSE.TXT Remove extraneous colons after program names for consistency 2005-05-12 21:39:01 +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 Two changes: 2005-04-22 17:14:14 +00:00
Makefile.rules Move some constant folding code shared by Analysis and Transform passes 2005-10-27 15:54:34 +00:00
README.txt

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.