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LLVM backend for 6502
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97f37a439c
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Chris Lattner 97f37a439c Fix a problem that Nate noticed that boils down to an over conservative check 
in the code that does "select C, (X+Y), (X-Y) --> (X+(select C, Y, (-Y)))".
We now compile this loop:

LBB1_1: ; no_exit
        add r6, r2, r3
        subf r3, r2, r3
        cmpwi cr0, r2, 0
        addi r7, r5, 4
        lwz r2, 0(r5)
        addi r4, r4, 1
        blt cr0, LBB1_4 ; no_exit
LBB1_3: ; no_exit
        mr r3, r6
LBB1_4: ; no_exit
        cmpwi cr0, r4, 16
        mr r5, r7
        bne cr0, LBB1_1 ; no_exit

into this instead:

LBB1_1: ; no_exit
        srawi r6, r2, 31
        add r2, r2, r6
        xor r6, r2, r6
        addi r7, r5, 4
        lwz r2, 0(r5)
        addi r4, r4, 1
        add r3, r3, r6
        cmpwi cr0, r4, 16
        mr r5, r7
        bne cr0, LBB1_1 ; no_exit


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26356 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-24 18:05:58 +00:00
autoconf don't build the skeleton target 2006-02-16 21:11:49 +00:00
docs Match the case of other mailing lists in the list 2006-02-23 16:18:29 +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 Add pointer and reference types. Added short-term code to ignore NULL types 2006-02-24 16:46:40 +00:00
lib Fix a problem that Nate noticed that boils down to an over conservative check 2006-02-24 18:05:58 +00:00
projects Convert over to the new way of handling lex/bison checked into cvs 2006-02-15 07:26:07 +00:00
runtime fix make install/uninstall of libcrtend. 2006-01-30 02:03:56 +00:00
test Add a test case for 'lea'. 2006-02-23 00:12:12 +00:00
tools Turn on loop unswitching tonight 2006-02-22 07:33:49 +00:00
utils Select inline asm memory operands. 2006-02-24 02:13:31 +00:00
win32 Inform Visual Studio of deleted file. 2006-02-17 02:11:34 +00:00
Xcode Catch up on some of the file addition/deletions. 2006-01-27 13:24:20 +00:00
.cvsignore Ignore the configure.out file generated by "make reconfigure" 2005-06-18 23:01:25 +00:00
configure remove skeleton target 2006-02-16 21:12:54 +00:00
CREDITS.TXT Add an entry 2006-01-08 08:25:38 +00:00
LICENSE.TXT Happy New Year, LLVM. 2006-01-03 14:42:06 +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 Implement fix for PR471: 2005-12-21 03:31:53 +00:00
Makefile.rules Fix a minor makefile bug with lex/yacc handling that nate noticed. We don't 2006-02-16 05:10:48 +00:00
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