Vendor import of llvm trunk r132879:

http://llvm.org/svn/llvm-project/llvm/trunk@132879

1 files changed, 29 insertions, 0 deletions

diff --git a/test/Transforms/GlobalOpt/memset-null.ll b/test/Transforms/GlobalOpt/memset-null.ll
new file mode 100644
index 0000000..01534025
--- /dev/null
+++ b/test/Transforms/GlobalOpt/memset-null.ll
@@ -0,0 +1,29 @@
+; RUN: opt -globalopt %s -S -o - | FileCheck %s
+; PR10047
+
+%0 = type { i32, void ()* }
+%struct.A = type { [100 x i32] }
+
+; CHECK: @a
+@a = global %struct.A zeroinitializer, align 4
+@llvm.global_ctors = appending global [2 x %0] [%0 { i32 65535, void ()* @_GLOBAL__I_a }, %0 { i32 65535, void ()* @_GLOBAL__I_b }]
+
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
+
+; CHECK-NOT: GLOBAL__I_a
+define internal void @_GLOBAL__I_a() nounwind {
+entry:
+  tail call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.A* @a to i8*), i8 0, i64 400, i32 4, i1 false) nounwind
+  ret void
+}
+
+%struct.X = type { i8 }
+@y = global i8* null, align 8
+@x = global %struct.X zeroinitializer, align 1
+
+define internal void @_GLOBAL__I_b() nounwind {
+entry:
+  %tmp.i.i.i = load i8** @y, align 8
+  tail call void @llvm.memset.p0i8.i64(i8* %tmp.i.i.i, i8 0, i64 10, i32 1, i1 false) nounwind
+  ret void
+}