From 5e018f9e29a2b7e67e82dfa17f32662f18a9bdf7 Mon Sep 17 00:00:00 2001
From: Alexey Bataev <a.bataev@hotmail.com>
Date: Thu, 23 Apr 2015 06:35:10 +0000
Subject: [OPENMP] Codegen for 'atomic capture'.

Adds codegen for 'atomic capture' constructs with the following forms of expressions/statements:

v = x binop= expr;
v = x++;
v = ++x;
v = x--;
v = --x;
v = x = x binop expr;
v = x = expr binop x;
{v = x; x = binop= expr;}
{v = x; x++;}
{v = x; ++x;}
{v = x; x--;}
{v = x; --x;}
{x = x binop expr; v = x;}
{x binop= expr; v = x;}
{x++; v = x;}
{++x; v = x;}
{x--; v = x;}
{--x; v = x;}
{x = x binop expr; v = x;}
{x = expr binop x; v = x;}
{v = x; x = expr;}
If x and expr are integer and binop is associative or x is a LHS in a RHS of the assignment expression, and atomics are allowed for type of x on the target platform atomicrmw instruction is emitted.
Otherwise compare-and-swap sequence is emitted.
Update of 'v' is not required to be be atomic with respect to the read or write of the 'x'.

bb:
...
atomic load <x>
cont:
<expected> = phi [ <x>, label %bb ], [ <new_failed>, %cont ]
<desired> = <expected> binop <expr>
<res> = cmpxchg atomic &<x>, desired, expected
<new_failed> = <res>.field1;
br <res>field2, label %exit, label %cont
exit:
atomic store <old/new x>, <v>
...
Differential Revision: http://reviews.llvm.org/D9049

llvm-svn: 235573
---
 clang/test/OpenMP/atomic_messages.cpp | 1 -
 1 file changed, 1 deletion(-)

(limited to 'clang/test/OpenMP/atomic_messages.cpp')

diff --git a/clang/test/OpenMP/atomic_messages.cpp b/clang/test/OpenMP/atomic_messages.cpp
index 7466509b275..73068141633 100644
--- a/clang/test/OpenMP/atomic_messages.cpp
+++ b/clang/test/OpenMP/atomic_messages.cpp
@@ -672,7 +672,6 @@ int capture() {
 #pragma omp atomic capture capture
   b = a /= b;
 
-  // expected-note@+1 {{in instantiation of function template specialization 'capture<int>' requested here}}
   return capture<int>();
 }
 
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