[PhaseOrdering] add test for late simplifycfg with LTO; NFC

Part of D102002

diff --git a/llvm/test/Transforms/PhaseOrdering/X86/simplifycfg-late.ll b/llvm/test/Transforms/PhaseOrdering/X86/simplifycfg-late.ll
new file mode 100644 (file)
index 0000000..6a71445
--- /dev/null
+++ b/llvm/test/Transforms/PhaseOrdering/X86/simplifycfg-late.ll
@@ -0,0 +1,67 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes='lto<O2>' -S | FileCheck %s
+
+target datalayout = "i32:32:32-i64:64:64"
+target triple = "x86_64--"
+
+; Verify that the "late" simplifycfg options are set. This should get converted into a lookup table.
+
+define i32 @f(i32 %c) {
+; CHECK-LABEL: @f(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    switch i32 [[C:%.*]], label [[SW_DEFAULT:%.*]] [
+; CHECK-NEXT:    i32 42, label [[RETURN:%.*]]
+; CHECK-NEXT:    i32 43, label [[SW_BB1:%.*]]
+; CHECK-NEXT:    i32 44, label [[SW_BB2:%.*]]
+; CHECK-NEXT:    i32 45, label [[SW_BB3:%.*]]
+; CHECK-NEXT:    i32 46, label [[SW_BB4:%.*]]
+; CHECK-NEXT:    i32 47, label [[SW_BB5:%.*]]
+; CHECK-NEXT:    i32 48, label [[SW_BB6:%.*]]
+; CHECK-NEXT:    ]
+; CHECK:       sw.bb1:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.bb2:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.bb3:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.bb4:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.bb5:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.bb6:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       sw.default:
+; CHECK-NEXT:    br label [[RETURN]]
+; CHECK:       return:
+; CHECK-NEXT:    [[R:%.*]] = phi i32 [ 15, [[SW_DEFAULT]] ], [ 1, [[SW_BB6]] ], [ 62, [[SW_BB5]] ], [ 27, [[SW_BB4]] ], [ -1, [[SW_BB3]] ], [ 0, [[SW_BB2]] ], [ 123, [[SW_BB1]] ], [ 55, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+entry:
+  switch i32 %c, label %sw.default [
+  i32 42, label %return
+  i32 43, label %sw.bb1
+  i32 44, label %sw.bb2
+  i32 45, label %sw.bb3
+  i32 46, label %sw.bb4
+  i32 47, label %sw.bb5
+  i32 48, label %sw.bb6
+  ]
+
+sw.bb1:
+  br label %return
+sw.bb2:
+  br label %return
+sw.bb3:
+  br label %return
+sw.bb4:
+  br label %return
+sw.bb5:
+  br label %return
+sw.bb6:
+  br label %return
+sw.default:
+  br label %return
+return:
+  %r = phi i32 [ 15, %sw.default ], [ 1, %sw.bb6 ], [ 62, %sw.bb5 ], [ 27, %sw.bb4 ], [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
+  ret i32 %r
+}