1 files changed, 102 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/regp-underflow.ll b/llvm/test/CodeGen/Hexagon/regp-underflow.ll
new file mode 100644
index 00000000000..748f98d744f
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/regp-underflow.ll
@@ -0,0 +1,102 @@
+; RUN: llc -march=hexagon -O2 < %s
+; REQUIRES: asserts
+
+target triple = "hexagon-unknown--elf"
+
+@g0 = global i32 0, align 4
+@g1 = global i32 0, align 4
+@g2 = global i32 0, align 4
+@g3 = global i32 0, align 4
+@g4 = common global [100 x i32] zeroinitializer, align 8
+@g5 = common global [100 x i32] zeroinitializer, align 8
+@g6 = private unnamed_addr constant [13 x i8] c"ping started\00"
+@g7 = private unnamed_addr constant [13 x i8] c"pong started\00"
+
+; Function Attrs: nounwind
+define void @f0(i8* nocapture readnone %a0) #0 {
+b0:
+  tail call void @f1(i8* %a0, i32 0)
+  ret void
+}
+
+; Function Attrs: nounwind
+define internal void @f1(i8* nocapture readnone %a0, i32 %a1) #0 {
+b0:
+  %v0 = icmp eq i32 %a1, 1
+  br i1 %v0, label %b2, label %b1
+
+b1:                                               ; preds = %b0
+  %v1 = tail call i32 @f3(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @g6, i32 0, i32 0))
+  store volatile i32 1, i32* @g0, align 4, !tbaa !0
+  br label %b3
+
+b2:                                               ; preds = %b0
+  %v2 = tail call i32 @f3(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @g7, i32 0, i32 0))
+  store volatile i32 1, i32* @g1, align 4, !tbaa !0
+  br label %b3
+
+b3:                                               ; preds = %b3, %b2, %b1
+  %v3 = load volatile i32, i32* @g2, align 4, !tbaa !0
+  %v4 = icmp eq i32 %v3, 0
+  br i1 %v4, label %b3, label %b4
+
+b4:                                               ; preds = %b3
+  %v5 = select i1 %v0, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @g5, i32 0, i32 0), i32* getelementptr inbounds ([100 x i32], [100 x i32]* @g4, i32 0, i32 0)
+  br label %b5
+
+b5:                                               ; preds = %b5, %b4
+  %v6 = phi i32* [ %v5, %b4 ], [ %v29, %b5 ]
+  %v7 = phi i32 [ 0, %b4 ], [ %v27, %b5 ]
+  %v8 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v8, i32* %v6, align 4, !tbaa !0
+  %v9 = getelementptr i32, i32* %v6, i32 1
+  %v10 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v10, i32* %v9, align 4, !tbaa !0
+  %v11 = getelementptr i32, i32* %v6, i32 2
+  %v12 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v12, i32* %v11, align 4, !tbaa !0
+  %v13 = getelementptr i32, i32* %v6, i32 3
+  %v14 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v14, i32* %v13, align 4, !tbaa !0
+  %v15 = getelementptr i32, i32* %v6, i32 4
+  %v16 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v16, i32* %v15, align 4, !tbaa !0
+  %v17 = getelementptr i32, i32* %v6, i32 5
+  %v18 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v18, i32* %v17, align 4, !tbaa !0
+  %v19 = getelementptr i32, i32* %v6, i32 6
+  %v20 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v20, i32* %v19, align 4, !tbaa !0
+  %v21 = getelementptr i32, i32* %v6, i32 7
+  %v22 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v22, i32* %v21, align 4, !tbaa !0
+  %v23 = getelementptr i32, i32* %v6, i32 8
+  %v24 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v24, i32* %v23, align 4, !tbaa !0
+  %v25 = getelementptr i32, i32* %v6, i32 9
+  %v26 = tail call i32 asm sideeffect "1:     $0 = memw_locked($2)\0A       $0 = add($0, $3)\0A       memw_locked($2, p0) = $0\0A       if !p0 jump 1b\0A", "=&r,=*m,r,r,*m,~{p0}"(i32* @g3, i32* @g3, i32 1, i32* @g3), !srcloc !4
+  store i32 %v26, i32* %v25, align 4, !tbaa !0
+  %v27 = add nsw i32 %v7, 10
+  %v28 = icmp eq i32 %v27, 100
+  %v29 = getelementptr i32, i32* %v6, i32 10
+  br i1 %v28, label %b6, label %b5
+
+b6:                                               ; preds = %b5
+  tail call void @f2(i32 0) #1
+  ret void
+}
+
+; Function Attrs: nounwind
+declare void @f2(i32) #1
+
+; Function Attrs: nounwind
+declare i32 @f3(i8* nocapture readonly) #1
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-fatures"="+hvx,+hvx-length64b" }
+attributes #1 = { nounwind }
+
+!0 = !{!1, !1, i64 0}
+!1 = !{!"int", !2, i64 0}
+!2 = !{!"omnipotent char", !3, i64 0}
+!3 = !{!"Simple C/C++ TBAA"}
+!4 = !{i32 12730, i32 12771, i32 12807, i32 12851}