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LLVM backend for 6502
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02c4285643
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Evan Cheng 02c4285643 Fixes a nasty dag combiner bug that causes a bunch of tests to fail at -O0. 
It's not safe to use the two value CombineTo variant to combine away a dead load.
e.g. 
v1, chain2 = load chain1, loc
v2, chain3 = load chain2, loc
v3         = add v2, c 
Now we replace use of v1 with undef, use of chain2 with chain1.
ReplaceAllUsesWith() will iterate through uses of the first load and update operands:
v1, chain2 = load chain1, loc
v2, chain3 = load chain1, loc
v3         = add v2, c 
Now the second load is the same as the first load, SelectionDAG cse will ensure
the use of second load is replaced with the first load.
v1, chain2 = load chain1, loc
v3         = add v1, c
Then v1 is replaced with undef and bad things happen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46099 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-16 23:11:54 +00:00
autoconf remove attribution from a variety of miscellaneous files. 2007-12-29 22:59:10 +00:00
bindings Modify Makefile.rules to allow makefiles to prepend to C.Flags and 2008-01-06 21:54:35 +00:00
docs Add description of 'llvm.trap' intrinsic. Also, minor fixes in formatting. 2008-01-15 22:31:34 +00:00
examples remove attributions from examples. 2007-12-29 20:37:57 +00:00
include Do not mark EH tables no-dead-strip unless the 2008-01-16 19:59:28 +00:00
lib Fixes a nasty dag combiner bug that causes a bunch of tests to fail at -O0. 2008-01-16 23:11:54 +00:00
projects remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
runtime With this patch, the LowerGC transformation becomes the 2008-01-07 01:30:53 +00:00
test Fixes a nasty dag combiner bug that causes a bunch of tests to fail at -O0. 2008-01-16 23:11:54 +00:00
tools - Introduces versioning macro LLVM_LTO_VERSION 2008-01-15 23:52:34 +00:00
utils Add files to windows project files. Also include <algorithm> explicitly so that vstudio build works 2008-01-15 21:43:17 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 Add files to windows project files. Also include <algorithm> explicitly so that vstudio build works 2008-01-15 21:43:17 +00:00
Xcode Removing obsolete files from the Xcode project. 2007-12-31 01:45:55 +00:00
build-for-llvm-top.sh Allow the configure options to be set according to the llvm-top options. 2007-08-31 19:53:42 +00:00
configure Do not build CBackend and MSIL regardless of configured targets 2007-12-13 01:18:52 +00:00
CREDITS.TXT Update credits. 2007-12-11 09:32:07 +00:00
LICENSE.TXT Updated source file headers to llvm coding standard. 2007-12-05 01:40:25 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.common remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.config.in improve compatibility with mingw, patch by Alain Frisch 2008-01-15 22:50:50 +00:00
Makefile.rules Commit a piece that I missed before, patch by Alain Frisch 2008-01-15 23:27:40 +00:00
ModuleInfo.txt Update to include clean and install commands. 2007-07-20 20:54:41 +00:00
README.txt test 2007-04-20 20:49:25 +00:00

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