PGO: preserve branch-weight metadata when simplifying Switch to a sub, an icmp

[oota-llvm.git] / test / Transforms / SimplifyCFG / preserve-branchweights.ll

diff --git a/test/Transforms/SimplifyCFG/preserve-branchweights.ll b/test/Transforms/SimplifyCFG/preserve-branchweights.ll
index 4b78747cb7a6b8ff49bd728a7ed5c83801e5dc08..beef5270082042cc61d754deeff57feb4f2be579 100644 (file)
--- a/test/Transforms/SimplifyCFG/preserve-branchweights.ll
+++ b/test/Transforms/SimplifyCFG/preserve-branchweights.ll
@@ -250,6 +250,49 @@ end:
     ret i1 %ret
 }
 
+define void @test10(i32 %x) nounwind readnone ssp noredzone {
+entry:
+ switch i32 %x, label %lor.rhs [
+   i32 2, label %lor.end
+   i32 1, label %lor.end
+   i32 3, label %lor.end
+ ], !prof !7
+
+lor.rhs:
+ call void @helper(i32 1) nounwind
+ ret void
+
+lor.end:
+ call void @helper(i32 0) nounwind
+ ret void
+
+; CHECK: test10
+; CHECK: %x.off = add i32 %x, -1
+; CHECK: %switch = icmp ult i32 %x.off, 3
+; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !8
+}
+
+; Remove dead cases from the switch.
+define void @test11(i32 %x) nounwind {
+  %i = shl i32 %x, 1
+  switch i32 %i, label %a [
+    i32 21, label %b
+    i32 24, label %c
+  ], !prof !8
+; CHECK: %cond = icmp eq i32 %i, 24
+; CHECK: br i1 %cond, label %c, label %a, !prof !9
+
+a:
+ call void @helper(i32 0) nounwind
+ ret void
+b:
+ call void @helper(i32 1) nounwind
+ ret void
+c:
+ call void @helper(i32 2) nounwind
+ ret void
+}
+
 !0 = metadata !{metadata !"branch_weights", i32 3, i32 5}
 !1 = metadata !{metadata !"branch_weights", i32 1, i32 1}
 !2 = metadata !{metadata !"branch_weights", i32 1, i32 2}
@@ -258,6 +301,7 @@ end:
 !5 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 5}
 !6 = metadata !{metadata !"branch_weights", i32 1, i32 3}
 !7 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8, i32 7}
+!8 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8}
 
 ; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11}
 ; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5}
@@ -267,4 +311,6 @@ end:
 ; CHECK: !5 = metadata !{metadata !"branch_weights", i32 17, i32 15} 
 ; CHECK: !6 = metadata !{metadata !"branch_weights", i32 9, i32 7}
 ; CHECK: !7 = metadata !{metadata !"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17}
-; CHECK-NOT: !8
+; CHECK: !8 = metadata !{metadata !"branch_weights", i32 24, i32 33}
+; CHECK: !9 = metadata !{metadata !"branch_weights", i32 8, i32 33}
+; CHECK-NOT: !9