Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/LoopRotate/phi-duplicate.ll

@@ -0,0 +1,40 @@
+; RUN: opt -S -loop-rotate < %s | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0"
+
+; PR5837
+define void @test(i32 %N, double* %G) nounwind ssp {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.body, %entry
+  %j.0 = phi i64 [ 1, %entry ], [ %inc, %for.body ] ; <i64> [#uses=5]
+  %cmp = icmp slt i64 %j.0, 1000                  ; <i1> [#uses=1]
+  br i1 %cmp, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  %arrayidx = getelementptr inbounds double, double* %G, i64 %j.0 ; <double*> [#uses=1]
+  %tmp3 = load double, double* %arrayidx                  ; <double> [#uses=1]
+  %sub = sub i64 %j.0, 1                          ; <i64> [#uses=1]
+  %arrayidx6 = getelementptr inbounds double, double* %G, i64 %sub ; <double*> [#uses=1]
+  %tmp7 = load double, double* %arrayidx6                 ; <double> [#uses=1]
+  %add = fadd double %tmp3, %tmp7                 ; <double> [#uses=1]
+  %arrayidx10 = getelementptr inbounds double, double* %G, i64 %j.0 ; <double*> [#uses=1]
+  store double %add, double* %arrayidx10
+  %inc = add nsw i64 %j.0, 1                      ; <i64> [#uses=1]
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  ret void
+}
+
+; Should only end up with one phi.
+; CHECK-LABEL:      define void @test(
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   br label %for.body
+; CHECK:      for.body:
+; CHECK-NEXT:   %j.01 = phi i64
+; CHECK-NOT:  br
+; CHECK:   br i1 %cmp, label %for.body, label %for.end
+; CHECK:      for.end:
+; CHECK-NEXT:        ret void