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LLVM backend for 6502
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5d52135a14
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Chris Lattner 5d52135a14 Upgrade the ugly darwin 64-bit bswap idiom (bswap %eax / bswap %edx / 
xchgl %eax, %edx) to llvm.bswap.i64.  This compiles:

long long test2(long long A) {
  return _OSSwapInt64(A);
}

to:

_test2:
        movl 8(%esp), %eax
        movl 4(%esp), %edx
        bswapl %eax
        bswapl %edx
        ret

instead of:

_test2:
        movl 8(%esp), %edx
        movl 4(%esp), %eax
        bswap   %eax
        bswap   %edx
        xchgl   %eax, %edx
        ret

GCC manages (with -fomit-frame-pointer) the uglier:

_test2:
        subl    $4, %esp
        movl    8(%esp), %eax
        movl    12(%esp), %edx
        bswap   %eax
        bswap   %edx
        xchgl   %eax, %edx
        addl    $4, %esp
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32001 91177308-0d34-0410-b5e6-96231b3b80d8
2006-11-29 01:48:01 +00:00
autoconf Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +00:00
docs remove dead tag 2006-11-27 21:53:28 +00:00
examples Replacing std::iostreams with llvm iostreams. Some of these changes involve 2006-11-29 00:19:40 +00:00
include/llvm add a hook to allow targets to hack on inline asms to lower them to llvm 2006-11-29 01:12:32 +00:00
lib Upgrade the ugly darwin 64-bit bswap idiom (bswap %eax / bswap %edx / 2006-11-29 01:48:01 +00:00
projects Replacing std::iostreams with llvm iostreams. Some of these changes involve 2006-11-29 00:19:40 +00:00
runtime Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +00:00
test Fix a typo. 2006-11-28 06:14:06 +00:00
tools Replacing std::iostreams with llvm iostreams. Some of these changes involve 2006-11-29 00:19:40 +00:00
utils Only show the first few lines of difference. 2006-11-25 04:07:06 +00:00
win32 Remove obsolete VS project. 2006-11-05 19:38:20 +00:00
Xcode Try again. 2006-11-05 21:21:20 +00:00
.cvsignore Add llvm.spec, a generated file. 2006-10-18 19:23:56 +00:00
configure Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +00:00
CREDITS.TXT The list is sorted by name. 2006-08-29 01:42:47 +00:00
LICENSE.TXT burg is gone 2006-09-11 17:28:11 +00:00
llvm.spec.in Minor technical correction in documentation. 2006-08-21 01:58:57 +00:00
Makefile Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +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 Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +00:00
Makefile.rules Undo removal of the runtime libraries. While this may have been a bit 2006-11-17 03:32:33 +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 
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.