1 files changed, 75 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/PowerPC/no-dup-of-bdnz.ll b/llvm/test/CodeGen/PowerPC/no-dup-of-bdnz.ll
new file mode 100644
index 00000000000..7d72242aa45
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/no-dup-of-bdnz.ll
@@ -0,0 +1,75 @@
+; RUN: opt -early-cse-memssa -loop-rotate -licm -loop-rotate -S %s -o - | FileCheck %s
+; ModuleID = 'bugpoint-reduced-simplified.bc'
+source_filename = "bugpoint-output-8903f29.bc"
+target datalayout = "e-m:e-i64:64-n32:64"
+target triple = "powerpc64le-unknown-linux-gnu"
+
+define void @test(i64 %arg.ssa, i64 %arg.nb) local_unnamed_addr {
+; Ensure that loop rotation doesn't duplicate the call to
+; llvm.ppc.is.decremented.ctr.nonzero
+; CHECK-LABEL: test
+; CHECK: call i1 @llvm.ppc.is.decremented.ctr.nonzero
+; CHECK-NOT: call i1 @llvm.ppc.is.decremented.ctr.nonzero
+; CHECK: declare i1 @llvm.ppc.is.decremented.ctr.nonzero
+entry:
+  switch i32 undef, label %BB_8 [
+    i32 -2, label %BB_9
+    i32 0, label %BB_9
+  ]
+
+BB_1:                                    ; preds = %BB_12, %BB_4
+  %bcount.1.us = phi i64 [ %.810.us, %BB_4 ], [ 0, %BB_12 ]
+  %0 = add i64 %arg.ssa, %bcount.1.us
+  %.568.us = load i32, i32* undef, align 4
+  %.15.i.us = icmp slt i32 0, %.568.us
+  br i1 %.15.i.us, label %BB_3, label %BB_2
+
+BB_2:                                          ; preds = %BB_1
+  %.982.us = add nsw i64 %0, 1
+  unreachable
+
+BB_3:                                          ; preds = %BB_1
+  %1 = add i64 %arg.ssa, %bcount.1.us
+  %2 = add i64 %1, 1
+  %3 = call i1 @llvm.ppc.is.decremented.ctr.nonzero()
+  br i1 %3, label %BB_4, label %BB_7
+
+BB_4:                                          ; preds = %BB_3
+  %.810.us = add nuw nsw i64 %bcount.1.us, 1
+  br label %BB_1
+
+BB_5:                                         ; preds = %BB_7, %BB_5
+  %lsr.iv20.i116 = phi i64 [ %2, %BB_7 ], [ %lsr.iv.next21.i126, %BB_5 ]
+  %lsr.iv.next21.i126 = add i64 %lsr.iv20.i116, 1
+  br i1 undef, label %BB_5, label %BB_6
+
+BB_6:                                         ; preds = %BB_5
+  ret void
+
+BB_7:                                     ; preds = %BB_3
+  br label %BB_5
+
+BB_8:                                           ; preds = %entry
+  ret void
+
+BB_9:                                        ; preds = %entry, %entry
+  br label %BB_10
+
+BB_10:                               ; preds = %BB_9
+  br label %BB_11
+
+BB_11:                                         ; preds = %BB_11, %BB_10
+  br i1 undef, label %BB_11, label %BB_12
+
+BB_12:                                         ; preds = %BB_11
+  call void @llvm.ppc.mtctr.i64(i64 %arg.nb)
+  br label %BB_1
+}
+
+; Function Attrs: nounwind
+declare void @llvm.ppc.mtctr.i64(i64) #0
+
+; Function Attrs: nounwind
+declare i1 @llvm.ppc.is.decremented.ctr.nonzero() #0
+
+attributes #0 = { nounwind }