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b6606e46ab
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Richard Sandiford b6606e46ab [SystemZ] Don't use LOAD and STORE REVERSED for volatile accesses 
Unlike most -- hopefully "all other", but I'm still checking -- memory
instructions we support, LOAD REVERSED and STORE REVERSED may access
the memory location several times.  This means that they are not suitable
for volatile loads and stores.

This patch is a prerequisite for better atomic load and store support.
The same principle applies there: almost all memory instructions we
support are inherently atomic ("block concurrent"), but LOAD REVERSED
and STORE REVERSED are exceptions.

Other instructions continue to allow volatile operands.  I will add
positive "allows volatile" tests at the same time as the "allows atomic
load or store" tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183002 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-31 13:25:22 +00:00
..
Analysis Fix ScalarEvolution::ComputeExitLimitFromCond for 'or' conditions. 2013-05-31 06:43:25 +00:00
Archive
AsmParser Add a new function attribute 'cold' to functions. 2013-05-24 12:26:52 +00:00
Bitcode Remove the Copied parameter from MemoryObject::readBytes. 2013-05-24 10:54:58 +00:00
CodeGen Fix rematerialization into physical registers. 2013-05-30 12:30:50 +00:00
DebugInfo Change how we iterate over relocations on ELF. 2013-05-30 03:05:14 +00:00
ExecutionEngine Change how we iterate over relocations on ELF. 2013-05-30 03:05:14 +00:00
IR Simplify logic by using the appropriate functions. 2013-05-29 17:33:31 +00:00
IRReader
Linker Extend RemapInstruction and friends to take an optional new parameter, a ValueMaterializer. 2013-05-28 15:17:05 +00:00
MC Remove debug print added in r182949. 2013-05-30 23:46:47 +00:00
Object Change how we iterate over relocations on ELF. 2013-05-30 03:05:14 +00:00
Option
Support Implement IEEE-754R 2008 nextUp/nextDown functions in the guise of the function APFloat::next(bool nextDown). 2013-05-30 18:07:13 +00:00
TableGen
Target [SystemZ] Don't use LOAD and STORE REVERSED for volatile accesses 2013-05-31 13:25:22 +00:00
Transforms [msan] Handle mixed track-origins and keep-going settings (llvm part). 2013-05-31 12:04:29 +00:00
CMakeLists.txt
LLVMBuild.txt
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