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LLVM backend for 6502
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c739cd6d07
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Chris Lattner c739cd6d07 my recent change caused a failure in a bswap testcase, because it changed 
the order that instcombine processed instructions in the testcase.  The end
result is that instcombine finished with:

define i16 @test1(i16 %a) {
        %tmp = zext i16 %a to i32               ; <i32> [#uses=2]
        %tmp21 = lshr i32 %tmp, 8               ; <i32> [#uses=1]
        %tmp5 = shl i32 %tmp, 8         ; <i32> [#uses=1]
        %tmp.upgrd.32 = or i32 %tmp21, %tmp5            ; <i32> [#uses=1]
        %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16           ; <i16> [#uses=1]
        ret i16 %tmp.upgrd.3
}

which can't get matched as a bswap.

This patch makes instcombine more sophisticated about removing truncating
casts, allowing it to turn this into:

define i16 @test2(i16 %a) {
        %tmp211 = lshr i16 %a, 8
        %tmp52 = shl i16 %a, 8
        %tmp.upgrd.323 = or i16 %tmp211, %tmp52
        ret i16 %tmp.upgrd.323
}

which then matches as bswap.  This fixes bswap.ll and implements
InstCombine/cast2.ll:test[12].  This also implements cast elimination of
add/sub.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34870 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-03 05:27:34 +00:00
autoconf Add possibility to set memory limit for binaries run via libSystem. This 2007-02-16 19:11:07 +00:00
docs grammaro 2007-03-02 02:57:34 +00:00
examples eliminate vector-related ctors 2007-02-13 06:06:26 +00:00
include Add isPositive for symmetry with isNegative. 2007-03-03 00:24:39 +00:00
lib my recent change caused a failure in a bswap testcase, because it changed 2007-03-03 05:27:34 +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: instcombine should remove all the casts. 2007-03-03 05:24:06 +00:00
tools Make output for ConstantInt construction correct for any bitwidth. 2007-03-01 20:55:43 +00:00
utils rename some CCActions 2007-02-28 05:29:06 +00:00
win32 Unbreak VC++ build. 2007-01-15 20:27:18 +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 Regenerate for getrlimit/setrlimit. 2007-02-16 19:17:20 +00:00
CREDITS.TXT Added myself 2007-02-27 10:44:42 +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 revert r1.68. This breaks 'make install' without doing 'make' first, but 2007-02-21 06:23:20 +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 PR739: 2007-01-17 20:24:45 +00:00
Makefile.rules correct dependency 2007-02-28 05:10:40 +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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