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LLVM backend for 6502
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9379557478
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Richard Sandiford 9379557478 [SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences 
This patch just uses a peephole test for "add; compare; branch" sequences
within a single block.  The IR optimizers already convert loops to
decrement-and-branch-on-nonzero form in some cases, so even this
simplistic test triggers many times during a clang bootstrap and
projects/test-suite run.  It looks like there are still cases where we
need to more strongly prefer branches on nonzero though.  E.g. I saw a
case where a loop that started out with a check for 0 ended up with a
check for -1.  I'll try to look at that sometime.

I ended up adding the Reference class because MachineInstr::readsRegister()
doesn't check for subregisters (by design, as far as I could tell).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187723 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-05 11:23:46 +00:00
autoconf Link with -rdynamic instead of -Wl,-export-dynamic. 2013-08-02 22:51:06 +00:00
bindings We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
cmake Pass -G argument to cmake with the same generator's name as used for the 2013-08-01 18:04:07 +00:00
docs Update the release notes about the status of the vectorizers. 2013-08-05 04:31:05 +00:00
examples ExceptionDemo.cpp: Tweak a @param. [-Wdocumentation] 2013-07-29 11:03:50 +00:00
include Don't leak passes if added outside of the area determined by Started/Stopped flags. 2013-08-05 11:11:11 +00:00
lib [SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences 2013-08-05 11:23:46 +00:00
projects Build with the $RDYNAMIC flag on Darwin as well as other platforms. 2013-08-04 22:06:11 +00:00
runtime Use @rpath for libraries rather than @executable_path on OSX. 2013-08-02 01:51:52 +00:00
test [SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences 2013-08-05 11:23:46 +00:00
tools Unbreak llvm-rtdyld build. 2013-08-03 22:18:45 +00:00
unittests Make one of the AttributeSet ctors maintain the invariant that the 2013-08-02 22:29:40 +00:00
utils Fix handling of CHECK-DAG combined with CHECK-NOT 2013-08-02 11:32:50 +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
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 with changes for -rdynamic. 2013-08-02 22:51:11 +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
LLVMBuild.txt
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 Build with the $RDYNAMIC flag on Darwin as well as other platforms. 2013-08-04 22:06:11 +00:00
README.txt test 2013-04-17 05:34:03 +00:00

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