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4 Commits

Author SHA1 Message Date
Tim Northover
68c567a38a IR: add a second ordering operand to cmpxhg for failure 
The syntax for "cmpxchg" should now look something like:

	cmpxchg i32* %addr, i32 42, i32 3 acquire monotonic

where the second ordering argument gives the required semantics in the case
that no exchange takes place. It should be no stronger than the first ordering
constraint and cannot be either "release" or "acq_rel" (since no store will
have taken place).

rdar://problem/15996804

llvm-svn: 203559
 2014-03-11 10:48:52 +00:00
Eli Friedman
3db429c878 Convert a bunch more tests over to the new atomic instructions. 
llvm-svn: 140582
 2011-09-26 23:15:09 +00:00
Andrew Trick
5361f35978 PR8297 
llvm-svn: 116223
 2010-10-11 21:08:42 +00:00
Andrew Trick
5704a15e36 Fixes bug 8297: i386 cmpxchg8b, missing MachineMemOperand 
llvm-svn: 116214
 2010-10-11 19:02:04 +00:00