vendor/llvm/llvm-trunk-r304149

1 files changed, 71 insertions, 0 deletions

diff --git a/test/Transforms/GVNSink/struct.ll b/test/Transforms/GVNSink/struct.ll
new file mode 100644
index 000000000000..2228cf2803ae
--- /dev/null
+++ b/test/Transforms/GVNSink/struct.ll
@@ -0,0 +1,71 @@
+; RUN: opt -gvn-sink -S < %s | FileCheck %s
+
+%struct = type {i32, i32}
+%struct2 = type { [ 2 x i32], i32 }
+
+; Struct indices cannot be variant.
+
+; CHECK-LABEL: @f() {
+; CHECK: getelementptr
+; CHECK: getelementptr
+define void @f() {
+bb:
+  br i1 undef, label %bb2, label %bb1
+
+bb1:                                              ; preds = %bb
+  %tmp = getelementptr inbounds %struct, %struct* null, i64 0, i32 1
+  br label %bb4
+
+bb2:                                              ; preds = %bb
+  %tmp3 = getelementptr inbounds %struct, %struct* null, i64 0, i32 0
+  br label %bb4
+
+bb4:                                              ; preds = %bb2, %bb1
+  %tmp5 = phi i32 [ 1, %bb1 ], [ 0, %bb2 ]
+  ret void
+}
+
+; Struct indices cannot be variant.
+
+; CHECK-LABEL: @g() {
+; CHECK: getelementptr
+; CHECK: getelementptr
+define void @g() {
+bb:
+  br i1 undef, label %bb2, label %bb1
+
+bb1:                                              ; preds = %bb
+  %tmp = getelementptr inbounds %struct2, %struct2* null, i64 0, i32 0, i32 1
+  br label %bb4
+
+bb2:                                              ; preds = %bb
+  %tmp3 = getelementptr inbounds %struct2, %struct2* null, i64 0, i32 0, i32 0
+  br label %bb4
+
+bb4:                                              ; preds = %bb2, %bb1
+  %tmp5 = phi i32 [ 1, %bb1 ], [ 0, %bb2 ]
+  ret void
+}
+
+
+; ... but the first parameter to a GEP can.
+
+; CHECK-LABEL: @h() {
+; CHECK: getelementptr
+; CHECK-NOT: getelementptr
+define void @h() {
+bb:
+  br i1 undef, label %bb2, label %bb1
+
+bb1:                                              ; preds = %bb
+  %tmp = getelementptr inbounds %struct, %struct* null, i32 0, i32 0
+  br label %bb4
+
+bb2:                                              ; preds = %bb
+  %tmp3 = getelementptr inbounds %struct, %struct* null, i32 1, i32 0
+  br label %bb4
+
+bb4:                                              ; preds = %bb2, %bb1
+  %tmp5 = phi i32 [ 0, %bb1 ], [ 1, %bb2 ]
+  ret void
+}
\ No newline at end of file