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LLVM backend for 6502
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ee4ea92358
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Chris Lattner ee4ea92358 Use the new TargetLowering::ComputeNumSignBits method to eliminate 
sign_extend_inreg operations.  Though ComputeNumSignBits is still rudimentary,
this is enough to compile this:

short test(short X, short x) {
  int Y = X+x;
  return (Y >> 1);
}
short test2(short X, short x) {
  int Y = (short)(X+x);
  return Y >> 1;
}

into:

_test:
        add r2, r3, r4
        srawi r3, r2, 1
        blr
_test2:
        add r2, r3, r4
        extsh r2, r2
        srawi r3, r2, 1
        blr

instead of:

_test:
        add r2, r3, r4
        srawi r2, r2, 1
        extsh r3, r2
        blr
_test2:
        add r2, r3, r4
        extsh r2, r2
        srawi r2, r2, 1
        extsh r3, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28146 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-06 09:30:03 +00:00
autoconf For PR747: 2006-04-27 07:49:24 +00:00
docs Actually, semantical doesn't appear to be a word. 2006-04-26 21:03:17 +00:00
examples Minor corrections. 2006-03-24 03:11:31 +00:00
include/llvm Add some new methods for computing sign bit information. 2006-05-06 09:26:22 +00:00
lib Use the new TargetLowering::ComputeNumSignBits method to eliminate 2006-05-06 09:30:03 +00:00
projects Have the AutoRegen.sh script prompt the user for the LLVM src and obj 2006-04-18 06:27:47 +00:00
runtime Invert the tests on LLVMGCC_MAJVERS to check for value 4 instead of value 2006-04-07 21:45:23 +00:00
test new testcase 2006-05-06 09:09:47 +00:00
tools wrap long line 2006-05-04 23:35:31 +00:00
utils Attempt to get this script working on Darwin. 2006-05-03 18:16:01 +00:00
win32 Keep Visual Studio happy. 2006-05-03 00:28:50 +00:00
Xcode Misc. project changes. html + build config changes supplied by Devang. 2006-04-08 06:04:56 +00:00
.cvsignore Ignore stuff built by "make dist". 2006-04-07 15:55:18 +00:00
configure For PR747: 2006-04-27 07:49:24 +00:00
CREDITS.TXT quick update 2006-04-13 02:05:30 +00:00
LICENSE.TXT Changing domain name 2006-04-20 05:51:53 +00:00
llvm.spec For PR723: 2006-04-07 16:07:37 +00:00
llvm.spec.in For PR723: 2006-04-07 16:07:37 +00:00
Makefile Include the win32 and Xcode directories in the distribution. 2006-04-12 20:53:14 +00:00
Makefile.common
Makefile.config.in Fix a comment. 2006-04-09 23:39:43 +00:00
Makefile.rules Remove traces of Burg utility now that its gone and not needed. 2006-04-20 18:42:24 +00:00
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README.txt 

Low Level Virtual Machine (LLVM)
================================

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