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

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/test/CodeGen/X86/atomic_op.ll b/llvm/test/CodeGen/X86/atomic_op.ll
index a378d6e8d68..b3045ed645b 100644
--- a/llvm/test/CodeGen/X86/atomic_op.ll
+++ b/llvm/test/CodeGen/X86/atomic_op.ll
@@ -101,11 +101,11 @@ entry:
 	%neg1 = sub i32 0, 10		; <i32> [#uses=1]
         ; CHECK: lock
         ; CHECK: cmpxchgl
-  %16 = cmpxchg i32* %val2, i32 %neg1, i32 1 monotonic
+  %16 = cmpxchg i32* %val2, i32 %neg1, i32 1 monotonic monotonic
 	store i32 %16, i32* %old
         ; CHECK: lock
         ; CHECK: cmpxchgl
-  %17 = cmpxchg i32* %val2, i32 1976, i32 1 monotonic
+  %17 = cmpxchg i32* %val2, i32 1976, i32 1 monotonic monotonic
 	store i32 %17, i32* %old
         ; CHECK: movl  [[R17atomic:.*]], %eax
         ; CHECK: movl	$1401, %[[R17mask:[a-z]*]]
@@ -133,6 +133,6 @@ entry:
 ; CHECK: lock
 ; CHECK:	cmpxchgl	%{{.*}}, %gs:(%{{.*}})
 
-  %0 = cmpxchg i32 addrspace(256)* %P, i32 0, i32 1 monotonic
+  %0 = cmpxchg i32 addrspace(256)* %P, i32 0, i32 1 monotonic monotonic
   ret void
 }