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LLVM backend for 6502
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Philip Reames cce3c83917 Refine memory dependence's notion of volatile semantics 
According to my reading of the LangRef, volatiles are only ordered with respect to other volatiles. It is entirely legal and profitable to forward unrelated loads over the volatile load. This patch implements this for GVN by refining the transition rules MemoryDependenceAnalysis uses when encountering a volatile.

The added test cases show where the extra flexibility is profitable for local dependence optimizations. I have a related change (227110) which will extend this to non-local dependence (i.e. PRE), but that's essentially orthogonal to the semantic change in this patch. I have tested the two together and can confirm that PRE works over a volatile load with both changes.  I will be submitting a PRE w/volatiles test case seperately in the near future.

Differential Revision: http://reviews.llvm.org/D6901



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227112 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-26 18:54:27 +00:00
autoconf Teach the autoconf machinery about the PS4 triple. 2015-01-26 15:25:05 +00:00
bindings IR: Return unique_ptr from MDNode::getTemporary() 2015-01-19 21:30:18 +00:00
cmake Reverting r226937: lit: Make MCJIT's supported arch check case insensitive 2015-01-24 01:42:44 +00:00
docs [docs] Add link to the MIPS 64-bit ELF object file specification 2015-01-25 16:20:30 +00:00
examples Reorder. 2015-01-19 00:35:33 +00:00
include Pass QueryInst down through non-local dependency calculation 2015-01-26 18:39:52 +00:00
lib Refine memory dependence's notion of volatile semantics 2015-01-26 18:54:27 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test Refine memory dependence's notion of volatile semantics 2015-01-26 18:54:27 +00:00
tools [ELFYAML] Support mips64 relocation record format in yaml2obj/obj2yaml 2015-01-25 13:29:25 +00:00
unittests Teach raw_ostream to support hex formatting without a prefix '0x'. 2015-01-26 18:21:33 +00:00
utils [X86] Replace i32i8imm on SSE/AVX instructions with i32u8imm which will make the assembler bounds check them. It will also make them print as unsigned. 2015-01-25 02:21:16 +00:00
.arcconfig
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore .gitignore: add some rules for tagging programs 2015-01-10 19:11:29 +00:00
CMakeLists.txt Trunk is now 3.7.0svn 2015-01-14 17:38:03 +00:00
CODE_OWNERS.TXT BPF backend 2015-01-24 17:51:26 +00:00
configure Trunk is now 3.7.0svn 2015-01-14 17:38:03 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt Check commit access 2015-01-16 19:23:34 +00:00

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