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LLVM backend for 6502
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8c20158fb0
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Richard Sandiford 8c20158fb0 [SystemZ] Use SRST to optimize memchr 
SystemZTargetLowering::emitStringWrapper() previously loaded the character
into R0 before the loop and made R0 live on entry.  I'd forgotten that
allocatable registers weren't allowed to be live across blocks at this stage,
and it confused LiveVariables enough to cause a miscompilation of f3 in
memchr-02.ll.

This patch instead loads R0 in the loop and leaves LICM to hoist it
after RA.  This is actually what I'd tried originally, but I went for
the manual optimisation after noticing that R0 often wasn't being hoisted.
This bug forced me to go back and look at why, now fixed as r188774.

We should also try to optimize null checks so that they test the CC result
of the SRST directly.  The select between null and the SRST GPR result could
then usually be deleted as dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188779 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-20 09:38:48 +00:00
autoconf Recognize NetBSD's terminfo implementation. 2013-08-17 11:06:00 +00:00
bindings We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
cmake Suppress an annoying CMake warning in ChooseMSVCCRT.cmake 2013-08-19 20:25:26 +00:00
docs Add a llvm.copysign intrinsic 2013-08-19 23:35:46 +00:00
examples ExceptionDemo.cpp: Tweak a @param. [-Wdocumentation] 2013-07-29 11:03:50 +00:00
include [SystemZ] Use SRST to optimize memchr 2013-08-20 09:38:48 +00:00
lib [SystemZ] Use SRST to optimize memchr 2013-08-20 09:38:48 +00:00
projects Port the detection of zlib from the main autoconf system to the sample 2013-08-18 01:55:15 +00:00
runtime Use @rpath for libraries rather than @executable_path on OSX. 2013-08-02 01:51:52 +00:00
test [SystemZ] Use SRST to optimize memchr 2013-08-20 09:38:48 +00:00
tools llvm-symbolizer: add support for .gnu_debuglink section 2013-08-14 17:09:30 +00:00
unittests Introduce SpecialCaseList::isIn overload for GlobalAliases. 2013-08-19 19:00:35 +00:00
utils [lit] Rewrite TODO list, and elaborate on some things. 2013-08-16 23:30:23 +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 CMake: polish the Windows packaging rules 2013-08-15 23:44:31 +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 Recognize NetBSD's terminfo implementation. 2013-08-17 11:06:00 +00:00
CREDITS.TXT Test commit. 2013-08-16 18:09:06 +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 Makefile.rules: Avoid -fomit-frame-pointer also on cygwin due to PR14646. 2013-08-18 03:38:40 +00:00
README.txt test 2013-04-17 05:34:03 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
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