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5052940c27
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Robin Morisset 5052940c27 Restore "[ARM, Fix] Fix emitLeading/TrailingFence on old ARM processors" 
Summary:
This patch was originally in D5304 (I could not find a way to reopen that revision).
It was accepted, commited and broke the build bots because the overloading of
the constructor of ArrayRef for braced initializer lists is not supported by all
toolchains. I then reverted it, and propose this fixed version that uses a plain
C array instead in makeDMB (that array is then converted implicitly to an
ArrayRef, but that is not behind an ifdef). Could someone confirm me whether
initialization lists for plain C arrays are supported by every toolchain used
to build llvm ? Otherwise I can just initialize the array in the old way:
args[0] = ...; .. ; args[5] = ...;

Below is the description of the original patch:
```
I had only tested this code for ARMv7 and ARMv8. This patch adds several
fallback paths if the processor does not support dmb ish:
- dmb sy if a cortex-M with support for dmb
- mcr p15, #0, r0, c7, c10, #5 for ARMv6 (special instruction equivalent to a DMB)
These fallback paths were chosen based on the code for fence seq_cst.

Thanks to luqmana for having noticed this bug.
```

Test Plan: Added more cases to atomic-load-store.ll + make check-all

Reviewers: jfb, t.p.northover, luqmana

Subscribers: llvm-commits, aemerson

Differential Revision: http://reviews.llvm.org/D5386

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218066 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-18 18:56:04 +00:00
autoconf
bindings
cmake Add CMake check for libatomic. 2014-09-12 11:08:59 +00:00
docs [docs] Mention character array constants in docs/LangRef.rst 2014-09-11 12:02:59 +00:00
examples Add doInitialization/doFinalization to DataLayoutPass. 2014-09-10 21:27:43 +00:00
include Add a new pass FunctionTargetTransformInfo. This pass serves as a 2014-09-18 00:34:14 +00:00
lib Restore "[ARM, Fix] Fix emitLeading/TrailingFence on old ARM processors" 2014-09-18 18:56:04 +00:00
projects
test Restore "[ARM, Fix] Fix emitLeading/TrailingFence on old ARM processors" 2014-09-18 18:56:04 +00:00
tools Alternative (to r216344) fix of gcc -Wpedantic. 2014-09-18 11:52:57 +00:00
unittests LineIterator: Provide a variant that keeps blank lines 2014-09-17 15:43:01 +00:00
utils [lit] Parse all strings as UTF-8 rather than ASCII. 2014-09-12 16:46:05 +00:00
.arcconfig
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy
.gitignore
CMakeLists.txt
CODE_OWNERS.TXT Add Tom Stellard's role as 3.5 release manager. 2014-09-12 08:07:31 +00:00
configure Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in
Makefile.rules Disable GCC's -Woverloaded-virtual in the configure+make build. Clang's is better. 2014-09-18 16:34:25 +00:00
README.txt

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