1 files changed, 91 insertions, 0 deletions
diff --git a/test/CodeGen/Hexagon/early-if-merge-loop.ll b/test/CodeGen/Hexagon/early-if-merge-loop.ll
new file mode 100644
index 0000000000000..f45058f029dd0
--- /dev/null
+++ b/test/CodeGen/Hexagon/early-if-merge-loop.ll
@@ -0,0 +1,91 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; Make sure that the loop in the end has only one basic block.
+
+; CHECK-LABEL: fred
+; Rely on the comments, make sure the one for the loop header is present.
+; CHECK: %loop
+; CHECK-NOT: %should_merge
+
+target triple = "hexagon"
+
+define i32 @fred(i32 %a0, i64* nocapture readonly %a1) #0 {
+b2:
+  %v3 = bitcast i64* %a1 to i32*
+  %v4 = getelementptr inbounds i32, i32* %v3, i32 1
+  %v5 = zext i32 %a0 to i64
+  br label %loop
+
+loop:                                             ; preds = %should_merge, %b2
+  %v7 = phi i32 [ 0, %b2 ], [ %v49, %should_merge ]
+  %v8 = phi i32 [ 0, %b2 ], [ %v42, %should_merge ]
+  %v9 = phi i32* [ %v4, %b2 ], [ %v53, %should_merge ]
+  %v10 = phi i32 [ 0, %b2 ], [ %v30, %should_merge ]
+  %v11 = phi i32* [ %v3, %b2 ], [ %v51, %should_merge ]
+  %v12 = phi i32 [ 0, %b2 ], [ %v23, %should_merge ]
+  %v13 = phi i32 [ 2, %b2 ], [ %v54, %should_merge ]
+  %v14 = load i32, i32* %v11, align 4, !tbaa !0
+  %v15 = load i32, i32* %v9, align 4, !tbaa !0
+  %v16 = icmp ult i32 %v13, 30
+  %v17 = zext i32 %v12 to i64
+  %v18 = shl nuw i64 %v17, 32
+  %v19 = zext i32 %v14 to i64
+  %v20 = or i64 %v18, %v19
+  %v21 = tail call i64 @llvm.hexagon.A2.addp(i64 %v20, i64 %v5)
+  %v22 = lshr i64 %v21, 32
+  %v23 = trunc i64 %v22 to i32
+  %v24 = zext i32 %v10 to i64
+  %v25 = shl nuw i64 %v24, 32
+  %v26 = zext i32 %v15 to i64
+  %v27 = or i64 %v25, %v26
+  %v28 = tail call i64 @llvm.hexagon.A2.addp(i64 %v27, i64 %v5)
+  %v29 = lshr i64 %v28, 32
+  %v30 = trunc i64 %v29 to i32
+  %v31 = getelementptr inbounds i32, i32* %v3, i32 %v13
+  %v32 = load i32, i32* %v31, align 4, !tbaa !0
+  %v33 = or i32 %v13, 1
+  %v34 = getelementptr inbounds i32, i32* %v3, i32 %v33
+  %v35 = load i32, i32* %v34, align 4, !tbaa !0
+  %v36 = zext i32 %v8 to i64
+  %v37 = shl nuw i64 %v36, 32
+  %v38 = zext i32 %v32 to i64
+  %v39 = or i64 %v37, %v38
+  %v40 = tail call i64 @llvm.hexagon.A2.subp(i64 %v39, i64 %v5)
+  %v41 = lshr i64 %v40, 32
+  %v42 = trunc i64 %v41 to i32
+  %v43 = zext i32 %v7 to i64
+  %v44 = shl nuw i64 %v43, 32
+  %v45 = zext i32 %v35 to i64
+  %v46 = or i64 %v44, %v45
+  %v47 = tail call i64 @llvm.hexagon.A2.subp(i64 %v46, i64 %v5)
+  %v48 = lshr i64 %v47, 32
+  %v49 = trunc i64 %v48 to i32
+  br i1 %v16, label %should_merge, label %exit
+
+should_merge:                                     ; preds = %loop
+  %v50 = add nuw nsw i32 %v13, 2
+  %v51 = getelementptr inbounds i32, i32* %v3, i32 %v50
+  %v52 = add nuw nsw i32 %v13, 3
+  %v53 = getelementptr inbounds i32, i32* %v3, i32 %v52
+  %v54 = add nuw nsw i32 %v13, 4
+  br label %loop
+
+exit:                                             ; preds = %loop
+  %v57 = tail call i64 @llvm.hexagon.A2.combinew(i32 %v42, i32 %v23)
+  %v58 = tail call i64 @llvm.hexagon.A2.combinew(i32 %v49, i32 %v30)
+  %v59 = tail call i64 @llvm.hexagon.A2.addp(i64 %v57, i64 %v58)
+  %v60 = lshr i64 %v59, 32
+  %v61 = trunc i64 %v60 to i32
+  ret i32 %v61
+}
+
+declare i64 @llvm.hexagon.A2.addp(i64, i64) #1
+declare i64 @llvm.hexagon.A2.subp(i64, i64) #1
+declare i64 @llvm.hexagon.A2.combinew(i32, i32) #1
+
+attributes #0 = { nounwind readonly "target-cpu"="hexagonv60" "target-features"="-hvx,-hvx-double,-long-calls" }
+attributes #1 = { nounwind readnone }
+
+!0 = !{!1, !1, i64 0}
+!1 = !{!"long", !2, i64 0}
+!2 = !{!"omnipotent char", !3, i64 0}
+!3 = !{!"Simple C/C++ TBAA"}