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3 Commits

Author SHA1 Message Date
Tim Northover
ca396e391e 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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203559 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-03-11 10:48:52 +00:00
Benjamin Kramer
44aac553f6 FileCheck hygiene. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147580 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-05 00:43:34 +00:00
Eli Friedman
43f51aeca8 Add support for generating CMPXCHG16B on x86-64 for the cmpxchg IR instruction. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138660 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-08-26 21:21:21 +00:00