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-rw-r--r--test/Transforms/IRCE/bug-loop-varying-upper-limit.ll31
1 files changed, 31 insertions, 0 deletions
diff --git a/test/Transforms/IRCE/bug-loop-varying-upper-limit.ll b/test/Transforms/IRCE/bug-loop-varying-upper-limit.ll
new file mode 100644
index 0000000..4635bb4
--- /dev/null
+++ b/test/Transforms/IRCE/bug-loop-varying-upper-limit.ll
@@ -0,0 +1,31 @@
+; RUN: opt -irce-print-changed-loops -S -irce -verify < %s 2>&1 | FileCheck %s
+
+; CHECK-NOT: constrained loop
+
+define void @single_access_no_preloop_no_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
+ entry:
+ %first.itr.check = icmp sgt i32 %n, 0
+ br i1 %first.itr.check, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
+ %idx.next = add i32 %idx, 1
+ %len = load i32, i32* %a_len_ptr, !range !0
+ %abc = icmp slt i32 %idx, %len
+ br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
+
+ in.bounds:
+ %addr = getelementptr i32, i32* %arr, i32 %idx
+ store i32 0, i32* %addr
+ %next = icmp slt i32 %idx.next, %n
+ br i1 %next, label %loop, label %exit
+
+ out.of.bounds:
+ ret void
+
+ exit:
+ ret void
+}
+
+!0 = !{i32 0, i32 2147483647}
+!1 = !{!"branch_weights", i32 64, i32 4}