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3 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
Benjamin Kramer
e5589bccdd FileCheck hygiene. 
llvm-svn: 147580
 2012-01-05 00:43:34 +00:00
Eli Friedman
9f95c7d381 Add support for generating CMPXCHG16B on x86-64 for the cmpxchg IR instruction. 
llvm-svn: 138660
 2011-08-26 21:21:21 +00:00