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LLVM backend for 6502
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895c4ab564
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Chris Lattner 895c4ab564 Fold (x << c1)>> c2 into a single shift if the bits shifted out aren't used. 
This compiles:
int baz(long long a) { return (short)(((int)(a >>24)) >> 9); }

into:
_baz:
        srwi r2, r3, 1
        extsh r3, r2
        blr

on PPC, instead of:
_baz:
        slwi r2, r3, 8
        srwi r2, r2, 9
        extsh r3, r2
        blr

GCC produces:
_baz:
        srwi r10,r4,24
        insrwi r10,r3,24,0
        srawi r9,r3,24
        srawi r3,r10,9
        extsh r3,r3
        blr

This implements CodeGen/PowerPC/shl_elim.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36221 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-17 21:14:16 +00:00
autoconf Hack the shared library extension for dylib. The existing code just looks 2007-04-11 00:33:43 +00:00
docs Remove "ModulePasses requiring FunctionPasses" from the list of future 2007-04-17 00:17:11 +00:00
examples Revert last patch. The examples build now. 2007-03-06 17:26:14 +00:00
include Copy coalescing change to prevent a physical register from being pin to a 2007-04-17 20:32:26 +00:00
lib Fold (x << c1)>> c2 into a single shift if the bits shifted out aren't used. 2007-04-17 21:14:16 +00:00
projects avoid collision with /usr/bin/sample if this ever gets installed. 2007-02-18 03:03:41 +00:00
runtime crtend is only for llvm-gcc3, remove it. 2007-02-23 19:34:09 +00:00
test new testcase 2007-04-17 21:12:26 +00:00
tools Regenerate. 2007-04-16 03:05:01 +00:00
utils For PR1328: 2007-04-16 06:54:34 +00:00
win32 Track new header file. 2007-04-08 21:19:52 +00:00
Xcode Update project 2007-01-29 18:45:08 +00:00
.cvsignore Add llvm.spec, a generated file. 2006-10-18 19:23:56 +00:00
configure Hopefully fix LTDL_SHLIB_EXT on Darwin 2007-04-11 00:27:39 +00:00
CREDITS.TXT Add Roman to credits 2007-03-21 21:45:25 +00:00
LICENSE.TXT remove these. 2007-02-25 02:28:21 +00:00
llvm.spec.in Minor technical correction in documentation. 2006-08-21 01:58:57 +00:00
Makefile Echo command lines only if the user wants them. 2007-04-15 06:22:48 +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 For PR789: 2007-03-29 19:05:44 +00:00
Makefile.rules Removed tabs everywhere except autogenerated & external files. Add make 2007-04-16 18:10:23 +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)
================================

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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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