[Hexagon] Pick the right branch opcode depending on branch probabilities
Specifically, pick the opcode with the correct branch prediction, i.e.
jump:t or jump:nt.
llvm-svn: 296821
diff --git a/llvm/test/CodeGen/Hexagon/builtin-expect.ll b/llvm/test/CodeGen/Hexagon/builtin-expect.ll
new file mode 100644
index 0000000..9945da1
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/builtin-expect.ll
@@ -0,0 +1,44 @@
+; RUN: llc -march=hexagon -disable-block-placement < %s | FileCheck %s
+
+; Check that the branch to the block b10 is marked as taken (i.e. ":t").
+; CHECK-LABEL: foo
+; CHECK: if ({{.*}}) jump:t .LBB0_[[LAB:[0-9]+]]
+; CHECK: [[LAB]]:
+; CHECK: add({{.*}},#65)
+
+target triple = "hexagon"
+
+define i32 @foo(i32 %a0) local_unnamed_addr #0 {
+b1:
+ %v2 = icmp eq i32 %a0, 0
+ br i1 %v2, label %b3, label %b10, !prof !0
+
+b3: ; preds = %b1
+ br label %b4
+
+b4: ; preds = %b4, %b3
+ %v5 = phi i32 [ %v6, %b4 ], [ 0, %b3 ]
+ %v6 = add nuw nsw i32 %v5, 1
+ %v7 = mul nuw nsw i32 %v5, 67
+ %v8 = tail call i32 @bar(i32 %v7) #0
+ %v9 = icmp eq i32 %v6, 10
+ br i1 %v9, label %b13, label %b4
+
+b10: ; preds = %b1
+ %v11 = add nsw i32 %a0, 65
+ %v12 = tail call i32 @bar(i32 %v11) #0
+ br label %b14
+
+b13: ; preds = %b4
+ br label %b14
+
+b14: ; preds = %b13, %b10
+ %v15 = phi i32 [ %v12, %b10 ], [ 0, %b13 ]
+ ret i32 %v15
+}
+
+declare i32 @bar(i32) local_unnamed_addr #0
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvx,-hvx-double,-long-calls" }
+
+!0 = !{!"branch_weights", i32 1, i32 2000}