[Hexagon] Custom-lower UADDO(x, 1) and USUBO(x, 1)

llvm-svn: 364790

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/isel-uaddo-1.ll b/llvm/test/CodeGen/Hexagon/isel-uaddo-1.ll
new file mode 100644
index 00000000000..092fb60e041
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/isel-uaddo-1.ll
@@ -0,0 +1,37 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+; Check that a hardware loop is generated.
+; CHECK: loop0
+
+target triple = "hexagon"
+
+; Function Attrs: norecurse nounwind
+define dso_local void @f0(i32* nocapture readonly %a0, i32* nocapture %a1) local_unnamed_addr #0 {
+b0:
+  br label %b1
+
+b1:                                               ; preds = %b1, %b0
+  %v0 = phi i32 [ %v3, %b1 ], [ 100, %b0 ]
+  %v1 = phi i32* [ %v6, %b1 ], [ %a1, %b0 ]
+  %v2 = phi i32* [ %v4, %b1 ], [ %a0, %b0 ]
+  %v3 = add nsw i32 %v0, -1
+  %v4 = getelementptr inbounds i32, i32* %v2, i32 1
+  %v5 = load i32, i32* %v2, align 4, !tbaa !1
+  %v6 = getelementptr inbounds i32, i32* %v1, i32 1
+  store i32 %v5, i32* %v1, align 4, !tbaa !1
+  %v7 = icmp eq i32 %v3, 0
+  br i1 %v7, label %b2, label %b1
+
+b2:                                               ; preds = %b1
+  ret void
+}
+
+attributes #0 = { norecurse nounwind "target-cpu"="hexagonv62" }
+
+!llvm.module.flags = !{!0}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{!2, !2, i64 0}
+!2 = !{!"int", !3, i64 0}
+!3 = !{!"omnipotent char", !4, i64 0}
+!4 = !{!"Simple C/C++ TBAA"}