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LLVM backend for 6502
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Jim Grosbach fc1a161d76 Switch the fixed-length disassembler to be table-driven. 
Refactor the TableGen'erated fixed length disassemblmer to use a
table-driven state machine rather than a massive set of nested
switch() statements.

As a result, the ARM Disassembler (ARMDisassembler.cpp) builds much more
quickly and generates a smaller end result. For a Release+Asserts build on
a 16GB 3.4GHz i7 iMac w/ SSD:

Time to compile at -O2 (averaged w/ hot caches):
  Previous: 35.5s
  New:       8.9s

TEXT size:
  Previous: 447,251
  New:      297,661

Builds in 25% of the time previously required and generates code 66% of
the size.

Execution time of the disassembler is only slightly slower (7% disassembling
10 million ARM instructions, 19.6s vs 21.0s). The new implementation has
not yet been tuned, however, so the performance should almost certainly
be recoverable should it become a concern.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161888 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-14 19:06:05 +00:00
autoconf [configure] Add a --enable-keep-symbols configure flag. 2012-08-14 18:14:20 +00:00
bindings
cmake revert my previous patch 2012-08-08 18:04:45 +00:00
docs Remove references to compression in llvm-ar. It has been a long time since we 2012-08-10 01:57:52 +00:00
examples
include Switch the fixed-length disassembler to be table-driven. 2012-08-14 19:06:05 +00:00
lib Switch the fixed-length disassembler to be table-driven. 2012-08-14 19:06:05 +00:00
projects
runtime
test [asan] insert crash basic blocks inline as opposed to inserting them at the end of the function. This doesn't seem to fix or break anything, but is considered to be more friendly to downstream passes (test change) 2012-08-14 14:05:50 +00:00
tools Remove references to compression in llvm-ar. It has been a long time since we 2012-08-10 01:57:52 +00:00
unittests Added test for non-static use of cl::opt (fixed in r160170) 2012-08-13 10:43:36 +00:00
utils Switch the fixed-length disassembler to be table-driven. 2012-08-14 19:06:05 +00:00
.gitignore
CMakeLists.txt Support for experimental targets 2012-08-09 01:13:59 +00:00
CODE_OWNERS.TXT
configure Update configure. 2012-08-14 18:14:22 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile Fix the make update target to work even when sub repo repositories are ignored. 2012-08-14 18:33:50 +00:00
Makefile.common
Makefile.config.in [configure] Add a --enable-keep-symbols configure flag. 2012-08-14 18:14:20 +00:00
Makefile.rules
README.txt

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