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LLVM backend for 6502
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0416e3c599
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Richard Sandiford 0416e3c599 [SystemZ] Move compare-and-branch generation even later 
r187116 moved compare-and-branch generation from the instruction-selection
pass to the peephole optimizer (via optimizeCompare).  It turns out that even
this is a bit too early.  Fused compare-and-branch instructions don't
interact well with predication, where a CC result is needed.  They also
make it harder to reuse the CC side-effects of earlier instructions
(not yet implemented, but the subject of a later patch).

Another problem was that the AnalyzeBranch family of routines weren't
handling compares and branches, so we weren't able to reverse the fused
form in cases where we would reverse a separate branch.  This could have
been fixed by extending AnalyzeBranch, but given the other problems,
I've instead moved the fusing to the long-branch pass, which is also
responsible for the opposite transformation: splitting out-of-range
compares and branches into separate compares and long branches.

I've added a test for the AnalyzeBranch problem.  A test for the
predication problem is included in the next patch, which fixes a bug
in the choice of CC mask.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187494 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-31 12:11:07 +00:00
autoconf Remove dead or useless header checks from cmake and autoconf 2013-07-26 16:54:23 +00:00
bindings We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
cmake Make sure that -gsplit-dwarf isn't passed to the linker. 2013-07-30 22:34:30 +00:00
docs Fix underscore to be the proper length. 2013-07-30 08:26:24 +00:00
examples ExceptionDemo.cpp: Tweak a @param. [-Wdocumentation] 2013-07-29 11:03:50 +00:00
include Make these just inline, not static inline. 2013-07-30 22:35:06 +00:00
lib [SystemZ] Move compare-and-branch generation even later 2013-07-31 12:11:07 +00:00
projects [PowerPC] Support powerpc64le as a syntax-checking target. 2013-07-26 01:35:43 +00:00
runtime Remove dead code from the makefile build system. 2013-07-25 20:25:31 +00:00
test [SystemZ] Move compare-and-branch generation even later 2013-07-31 12:11:07 +00:00
tools Add support for the 's' operation to llvm-ar. 2013-07-29 12:40:31 +00:00
unittests Fix ptr vector inconsistency in CreatePointerCast 2013-07-31 00:17:33 +00:00
utils Fix register pressure tables on ARM. 2013-07-31 03:24:31 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt Add capability for building with -gsplit-dwarf to the cmake build. 2013-07-30 21:44:10 +00:00
CODE_OWNERS.TXT Add more owners to CODE_OWNERS.TXT (Kostya Serebryany: AddressSanitizer and ThreadSanitizer; Evgeniy Stepanov: MemorySanitizer) 2013-06-27 08:47:12 +00:00
configure Regenerate. 2013-07-26 17:13:47 +00:00
CREDITS.TXT Identify me on IRC. 2013-06-18 22:09:36 +00:00
LICENSE.TXT Be more specific and capitalize filenames. 2013-05-21 21:22:34 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile Fix regular expression used by 'make update' to only look for 'I' and '?' at the start of svn info results and to check for spaces after 'I' instead of just after '?'. 2013-07-03 14:48:37 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add an autoconf option for turning on -gsplit-dwarf by default 2013-06-25 01:12:25 +00:00
Makefile.rules Remove dead code from the makefile build system. 2013-07-25 20:25:31 +00:00
README.txt test 2013-04-17 05:34:03 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
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