Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/LoopUnroll/basic.ll b/llvm/test/Transforms/LoopUnroll/basic.ll
new file mode 100644
index 0000000..1ceac935
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnroll/basic.ll
@@ -0,0 +1,48 @@
+; RUN: opt < %s -loop-unroll -S | FileCheck %s
+; RUN: opt < %s -passes='require<opt-remark-emit>,unroll' -S | FileCheck %s
+
+
+; This should not unroll since the address of the loop header is taken.
+
+; CHECK-LABEL: @test1(
+; CHECK: store i8* blockaddress(@test1, %l1), i8** %P
+; CHECK: l1:
+; CHECK-NEXT: phi i32
+; rdar://8287027
+define i32 @test1(i8** %P) nounwind ssp {
+entry:
+ store i8* blockaddress(@test1, %l1), i8** %P
+ br label %l1
+
+l1: ; preds = %l1, %entry
+ %x.0 = phi i32 [ 0, %entry ], [ %inc, %l1 ]
+ %inc = add nsw i32 %x.0, 1
+ %exitcond = icmp eq i32 %inc, 3
+ br i1 %exitcond, label %l2, label %l1
+
+l2: ; preds = %l1
+ ret i32 0
+}
+
+; This should not unroll since the call is 'noduplicate'.
+
+; CHECK-LABEL: @test2(
+define i32 @test2(i8** %P) nounwind ssp {
+entry:
+ br label %l1
+
+l1: ; preds = %l1, %entry
+ %x.0 = phi i32 [ 0, %entry ], [ %inc, %l1 ]
+; CHECK: call void @f()
+; CHECK-NOT: call void @f()
+ call void @f() noduplicate
+ %inc = add nsw i32 %x.0, 1
+ %exitcond = icmp eq i32 %inc, 3
+ br i1 %exitcond, label %l2, label %l1
+
+l2: ; preds = %l1
+ ret i32 0
+; CHECK: }
+}
+
+declare void @f()