1 files changed, 80 insertions, 0 deletions
diff --git a/test/Transforms/GVN/atomic.ll b/test/Transforms/GVN/atomic.ll
new file mode 100644
index 0000000..094e22b
--- /dev/null
+++ b/test/Transforms/GVN/atomic.ll
@@ -0,0 +1,80 @@
+; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-macosx10.7.0"
+
+@x = common global i32 0, align 4
+@y = common global i32 0, align 4
+
+; GVN across unordered store (allowed)
+define i32 @test1() nounwind uwtable ssp {
+; CHECK: test1
+; CHECK: add i32 %x, %x
+entry:
+  %x = load i32* @y
+  store atomic i32 %x, i32* @x unordered, align 4
+  %y = load i32* @y
+  %z = add i32 %x, %y
+  ret i32 %z
+}
+
+; GVN across seq_cst store (allowed in theory; not implemented ATM)
+define i32 @test2() nounwind uwtable ssp {
+; CHECK: test2
+; CHECK: add i32 %x, %y
+entry:
+  %x = load i32* @y
+  store atomic i32 %x, i32* @x seq_cst, align 4
+  %y = load i32* @y
+  %z = add i32 %x, %y
+  ret i32 %z
+}
+
+; GVN across unordered load (allowed)
+define i32 @test3() nounwind uwtable ssp {
+; CHECK: test3
+; CHECK: add i32 %x, %x
+entry:
+  %x = load i32* @y
+  %y = load atomic i32* @x unordered, align 4
+  %z = load i32* @y
+  %a = add i32 %x, %z
+  %b = add i32 %y, %a
+  ret i32 %b
+}
+
+; GVN across acquire load (load after atomic load must not be removed)
+define i32 @test4() nounwind uwtable ssp {
+; CHECK: test4
+; CHECK: load atomic i32* @x
+; CHECK: load i32* @y
+entry:
+  %x = load i32* @y
+  %y = load atomic i32* @x seq_cst, align 4
+  %x2 = load i32* @y
+  %x3 = add i32 %x, %x2
+  %y2 = add i32 %y, %x3
+  ret i32 %y2
+}
+
+; GVN load to unordered load (allowed)
+define i32 @test5() nounwind uwtable ssp {
+; CHECK: test5
+; CHECK: add i32 %x, %x
+entry:
+  %x = load atomic i32* @x unordered, align 4
+  %y = load i32* @x
+  %z = add i32 %x, %y
+  ret i32 %z
+}
+
+; GVN unordered load to load (unordered load must not be removed)
+define i32 @test6() nounwind uwtable ssp {
+; CHECK: test6
+; CHECK: load atomic i32* @x unordered
+entry:
+  %x = load i32* @x
+  %x2 = load atomic i32* @x unordered, align 4
+  %x3 = add i32 %x, %x2
+  ret i32 %x3
+}