vendor/llvm/llvm-trunk-r300422

1 files changed, 42 insertions, 0 deletions

diff --git a/test/Transforms/LoopDeletion/invalidation.ll b/test/Transforms/LoopDeletion/invalidation.ll
new file mode 100644
index 000000000000..5564f90e1ea7
--- /dev/null
+++ b/test/Transforms/LoopDeletion/invalidation.ll
@@ -0,0 +1,42 @@
+; Ensure we don't run analyses over loops after they've been deleted. We run
+; one version with a no-op loop pass to make sure that the loop doesn't get
+; simplified away.
+;
+; RUN: opt < %s -passes='require<ivusers>,no-op-loop,require<ivusers>' -S \
+; RUN:     | FileCheck %s --check-prefixes=CHECK,BEFORE
+; RUN: opt < %s -passes='require<ivusers>,loop-deletion,require<ivusers>' -S \
+; RUN:     | FileCheck %s --check-prefixes=CHECK,AFTER
+
+
+define void @foo(i64 %n, i64 %m) nounwind {
+; CHECK-LABEL: @foo(
+
+entry:
+  br label %bb
+; CHECK:       entry:
+; BEFORE-NEXT:   br label %bb
+; AFTER-NEXT:    br label %return
+
+bb:
+  %x.0 = phi i64 [ 0, %entry ], [ %t0, %bb2 ]
+  %t0 = add i64 %x.0, 1
+  %t1 = icmp slt i64 %x.0, %n
+  br i1 %t1, label %bb2, label %return
+; BEFORE:      bb:
+; BEFORE:        br i1 {{.*}}, label %bb2, label %return
+; AFTER-NOT:   bb:
+; AFTER-NOT:     br
+
+bb2:
+  %t2 = icmp slt i64 %x.0, %m
+  br i1 %t1, label %bb, label %return
+; BEFORE:      bb2:
+; BEFORE:        br i1 {{.*}}, label %bb, label %return
+; AFTER-NOT:   bb2:
+; AFTER-NOT:     br
+
+return:
+  ret void
+; CHECK:       return:
+; CHECK-NEXT:    ret void
+}