Add a test for performing GVNPRE on select instructions.

llvm-svn: 37782

llvm/test/Transforms/GVNPRE/select.ll

@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | opt -gvnpre | llvm-dis | grep b.gvnpre
+
+define i32 @extract() {
+entry:		; preds = %cond_false, %entry
+	br i1 true, label %cond_true, label %cond_false
+
+cond_true:
+  br label %end
+
+cond_false:
+  %a = select i1 true, i32 0, i32 1
+  br label %end
+
+end:
+  %b = select i1 true, i32 0, i32 1
+  ret i32 %b
+}