1 files changed, 94 insertions, 0 deletions
diff --git a/test/Analysis/MemorySSA/volatile-clobber.ll b/test/Analysis/MemorySSA/volatile-clobber.ll
new file mode 100644
index 0000000000000..d6f960f3e382a
--- /dev/null
+++ b/test/Analysis/MemorySSA/volatile-clobber.ll
@@ -0,0 +1,94 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
+;
+; Ensures that volatile stores/loads count as MemoryDefs
+
+; CHECK-LABEL: define i32 @foo
+define i32 @foo() {
+  %1 = alloca i32, align 4
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: store volatile i32 4
+  store volatile i32 4, i32* %1, align 4
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: store volatile i32 8
+  store volatile i32 8, i32* %1, align 4
+; CHECK: 3 = MemoryDef(2)
+; CHECK-NEXT: %2 = load volatile i32
+  %2 = load volatile i32, i32* %1, align 4
+; CHECK: 4 = MemoryDef(3)
+; CHECK-NEXT: %3 = load volatile i32
+  %3 = load volatile i32, i32* %1, align 4
+  %4 = add i32 %3, %2
+  ret i32 %4
+}
+
+; Ensuring that we don't automatically hoist nonvolatile loads around volatile
+; loads
+; CHECK-LABEL define void @volatile_only
+define void @volatile_only(i32* %arg1, i32* %arg2) {
+  ; Trivially NoAlias/MustAlias
+  %a = alloca i32
+  %b = alloca i32
+
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: load volatile i32, i32* %a
+  load volatile i32, i32* %a
+; CHECK: MemoryUse(liveOnEntry)
+; CHECK-NEXT: load i32, i32* %b
+  load i32, i32* %b
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: load i32, i32* %a
+  load i32, i32* %a
+
+  ; MayAlias
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: load volatile i32, i32* %arg1
+  load volatile i32, i32* %arg1
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: load i32, i32* %arg2
+  load i32, i32* %arg2
+
+  ret void
+}
+
+; Ensuring that volatile atomic operations work properly.
+; CHECK-LABEL define void @volatile_atomics
+define void @volatile_atomics(i32* %arg1, i32* %arg2) {
+  %a = alloca i32
+  %b = alloca i32
+
+ ; Trivially NoAlias/MustAlias
+
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: load atomic volatile i32, i32* %a acquire, align 4
+  load atomic volatile i32, i32* %a acquire, align 4
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: load i32, i32* %b
+  load i32, i32* %b
+
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: load atomic volatile i32, i32* %a monotonic, align 4
+  load atomic volatile i32, i32* %a monotonic, align 4
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: load i32, i32* %b
+  load i32, i32* %b
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: load atomic i32, i32* %b unordered, align 4
+  load atomic i32, i32* %b unordered, align 4
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: load atomic i32, i32* %a unordered, align 4
+  load atomic i32, i32* %a unordered, align 4
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: load i32, i32* %a
+  load i32, i32* %a
+
+  ; MayAlias
+; CHECK: 3 = MemoryDef(2)
+; CHECK-NEXT: load atomic volatile i32, i32* %arg1 monotonic, align 4
+  load atomic volatile i32, i32* %arg1 monotonic, align 4
+; CHECK: MemoryUse(3)
+; CHECK-NEXT: load i32, i32* %arg2
+  load i32, i32* %arg2
+
+  ret void
+}