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LLVM backend for 6502
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aedb288d86
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Richard Sandiford aedb288d86 Add TargetLowering::prepareVolatileOrAtomicLoad 
One unusual feature of the z architecture is that the result of a
previous load can be reused indefinitely for subsequent loads, even if
a cache-coherent store to that location is performed by another CPU.
A special serializing instruction must be used if you want to force
a load to be reattempted.

Since volatile loads are not supposed to be omitted in this way,
we should insert a serializing instruction before each such load.
The same goes for atomic loads.

The patch implements this at the IR->DAG boundary, in a similar way
to atomic fences.  It is a no-op for targets other than SystemZ.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196906 91177308-0d34-0410-b5e6-96231b3b80d8
2013-12-10 10:49:34 +00:00
autoconf Update to reflect the next release. 2013-11-20 10:10:50 +00:00
bindings [OCaml] Add a slash accidentally omitted from Makefile 2013-11-28 09:03:28 +00:00
cmake [CMake] add_lit_target: Let lit.site.cfg free from "--param build_mode" on single configuration builds, like autoconf build. 2013-12-04 11:15:17 +00:00
docs Remove the notion of primitive types. 2013-12-07 19:34:20 +00:00
examples [weak vtables] Place class definitions into anonymous namespaces to prevent weak vtables. 2013-11-19 03:08:35 +00:00
include Add TargetLowering::prepareVolatileOrAtomicLoad 2013-12-10 10:36:34 +00:00
lib Add TargetLowering::prepareVolatileOrAtomicLoad 2013-12-10 10:49:34 +00:00
projects Revert "Revert "Windows: Add support for unicode command lines"" 2013-10-07 01:00:07 +00:00
test Add TargetLowering::prepareVolatileOrAtomicLoad 2013-12-10 10:49:34 +00:00
tools [CMake] lli/CMakeLists.txt: Move add_subdirectory(ChildTarget) to the front. It depends on nothing described in LLVM_LINK_COMPONENTS. 2013-12-10 10:30:08 +00:00
unittests [asan] rewrite asan's stack frame layout 2013-12-06 09:00:17 +00:00
utils Correct word hyphenations 2013-12-05 05:44:44 +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
.clang-format Add a clang-format file so that the tool can automatically detect the 2013-09-02 07:19:04 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt CMake : optionaly enable LLVM to be compiled with -std=c++11 (default: off) 2013-11-26 10:33:53 +00:00
CODE_OWNERS.TXT Update email address. 2013-12-04 09:42:49 +00:00
configure Update to reflect the next release. 2013-11-20 10:10:50 +00:00
CREDITS.TXT Update CREDITS 2013-11-17 11:44:36 +00:00
LICENSE.TXT Be more specific and capitalize filenames. 2013-05-21 21:22:34 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +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 Teach the Makefile build system how to handle SOURCES which include 2013-11-14 23:51:29 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +00:00

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