[test] pre-submission for the following SimpleLoopUnswitch update

llvm/test/Transforms/SimpleLoopUnswitch/PGO-nontrivial-unswitch2.ll

@@ -0,0 +1,77 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+
+; RUN: opt < %s -passes='require<profile-summary>,function(loop-mssa(simple-loop-unswitch<nontrivial>))' -S | FileCheck %s
+
+declare i32 @a()
+declare i32 @b()
+
+; Check loops will be applied non-trivial loop unswitch in a non-cold function,
+; even loop headers are cold
+
+define void @f1(i32 %i, i1 %cond, i1 %hot_cond, i1 %cold_cond, i1* %ptr) !prof !0 {
+; CHECK-LABEL: @f1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[ENTRY_COLD_LOOP:%.*]]
+; CHECK:       entry_cold_loop:
+; CHECK-NEXT:    br i1 [[COLD_COND:%.*]], label [[COLD_LOOP_BEGIN_PREHEADER:%.*]], label [[COLD_LOOP_EXIT:%.*]], !prof [[PROF15:![0-9]+]]
+; CHECK:       cold_loop_begin.preheader:
+; CHECK-NEXT:    br label [[COLD_LOOP_BEGIN:%.*]]
+; CHECK:       cold_loop_begin:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[COLD_LOOP_A:%.*]], label [[COLD_LOOP_B:%.*]]
+; CHECK:       cold_loop_a:
+; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @a()
+; CHECK-NEXT:    br label [[COLD_LOOP_LATCH:%.*]]
+; CHECK:       cold_loop_b:
+; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @b()
+; CHECK-NEXT:    br label [[COLD_LOOP_LATCH]]
+; CHECK:       cold_loop_latch:
+; CHECK-NEXT:    [[V2:%.*]] = load i1, i1* [[PTR:%.*]], align 1
+; CHECK-NEXT:    br i1 [[V2]], label [[COLD_LOOP_BEGIN]], label [[COLD_LOOP_EXIT_LOOPEXIT:%.*]]
+; CHECK:       cold_loop_exit.loopexit:
+; CHECK-NEXT:    br label [[COLD_LOOP_EXIT]]
+; CHECK:       cold_loop_exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %entry_cold_loop
+
+entry_cold_loop:
+  br i1 %cold_cond, label %cold_loop_begin, label %cold_loop_exit, !prof !16
+
+cold_loop_begin:
+  br i1 %cond, label %cold_loop_a, label %cold_loop_b
+
+cold_loop_a:
+  call i32 @a()
+  br label %cold_loop_latch
+
+cold_loop_b:
+  call i32 @b()
+  br label %cold_loop_latch
+
+cold_loop_latch:
+  %v2 = load i1, i1* %ptr
+  br i1 %v2, label %cold_loop_begin, label %cold_loop_exit
+
+cold_loop_exit:
+  ret void
+}
+
+!llvm.module.flags = !{!1}
+!0 = !{!"function_entry_count", i64 400}
+!1 = !{i32 1, !"ProfileSummary", !2}
+!2 = !{!3, !4, !5, !6, !7, !8, !9, !10}
+!3 = !{!"ProfileFormat", !"InstrProf"}
+!4 = !{!"TotalCount", i64 10000}
+!5 = !{!"MaxCount", i64 10}
+!6 = !{!"MaxInternalCount", i64 1}
+!7 = !{!"MaxFunctionCount", i64 1000}
+!8 = !{!"NumCounts", i64 3}
+!9 = !{!"NumFunctions", i64 3}
+!10 = !{!"DetailedSummary", !11}
+!11 = !{!12, !13, !14}
+!12 = !{i32 10000, i64 100, i32 1}
+!13 = !{i32 999000, i64 100, i32 1}
+!14 = !{i32 999999, i64 1, i32 2}
+!15 = !{!"branch_weights", i32 100, i32 0}
+!16 = !{!"branch_weights", i32 0, i32 100}