[UnifyLoopExits] Precommit test with phis selecting only undef

Author: jdoerfert

llvm/test/Transforms/UnifyLoopExits/undef-phis.ll

@@ -0,0 +1,59 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes='unify-loop-exits' -S | FileCheck %s
+
+define fastcc void @undef_phi(i64 %i5247, i1 %i4530, i1 %i4936.not) {
+; CHECK-LABEL: define fastcc void @undef_phi(
+; CHECK-SAME: i64 [[I5247:%.*]], i1 [[I4530:%.*]], i1 [[I4936_NOT:%.*]]) {
+; CHECK-NEXT:  [[BB:.*:]]
+; CHECK-NEXT:    br label %[[MBB3932:.*]]
+; CHECK:       [[MBB3932]]:
+; CHECK-NEXT:    br label %[[MBB4454:.*]]
+; CHECK:       [[MBB4321:.*]]:
+; CHECK-NEXT:    [[TMP0:%.*]] = trunc i64 [[I5247]] to i32
+; CHECK-NEXT:    [[I5290:%.*]] = icmp eq i32 [[TMP0]], 0
+; CHECK-NEXT:    br i1 [[I5290]], label %[[MBB3932]], label %[[LOOP_EXIT_GUARD:.*]]
+; CHECK:       [[MBB4454]]:
+; CHECK-NEXT:    br i1 [[I4530]], label %[[MBB4535:.*]], label %[[LOOP_EXIT_GUARD1:.*]]
+; CHECK:       [[MBB4531:.*]]:
+; CHECK-NEXT:    ret void
+; CHECK:       [[MBB4535]]:
+; CHECK-NEXT:    br i1 [[I4936_NOT]], label %[[LOOP_EXIT_GUARD1]], label %[[MBB4454]]
+; CHECK:       [[MBB5291:.*]]:
+; CHECK-NEXT:    [[I5293:%.*]] = insertvalue [2 x i32] zeroinitializer, i32 [[DOTMOVED:%.*]], 1
+; CHECK-NEXT:    store volatile [2 x i32] [[I5293]], ptr addrspace(5) null, align 4
+; CHECK-NEXT:    ret void
+; CHECK:       [[LOOP_EXIT_GUARD]]:
+; CHECK-NEXT:    [[DOTMOVED]] = phi i32 [ [[TMP0]], %[[MBB4321]] ], [ [[DOTMOVED_MOVED:%.*]], %[[LOOP_EXIT_GUARD1]] ]
+; CHECK-NEXT:    [[GUARD_MBB4531:%.*]] = phi i1 [ false, %[[MBB4321]] ], [ [[GUARD_MBB4531_MOVED:%.*]], %[[LOOP_EXIT_GUARD1]] ]
+; CHECK-NEXT:    br i1 [[GUARD_MBB4531]], label %[[MBB4531]], label %[[MBB5291]]
+; CHECK:       [[LOOP_EXIT_GUARD1]]:
+; CHECK-NEXT:    [[GUARD_MBB4531_MOVED]] = phi i1 [ true, %[[MBB4454]] ], [ undef, %[[MBB4535]] ]
+; CHECK-NEXT:    [[DOTMOVED_MOVED]] = phi i32 [ poison, %[[MBB4454]] ], [ undef, %[[MBB4535]] ]
+; CHECK-NEXT:    [[GUARD_LOOP_EXIT_GUARD:%.*]] = phi i1 [ true, %[[MBB4454]] ], [ false, %[[MBB4535]] ]
+; CHECK-NEXT:    br i1 [[GUARD_LOOP_EXIT_GUARD]], label %[[LOOP_EXIT_GUARD]], label %[[MBB4321]]
+;
+mbb:
+  br label %mbb3932
+
+mbb3932:                                           ; preds = %mbb4321, %mbb
+  br label %mbb4454
+
+mbb4321:                                           ; preds = %mbb4535
+  %0 = trunc i64 %i5247 to i32
+  %i5290 = icmp eq i32 %0, 0
+  br i1 %i5290, label %mbb3932, label %mbb5291
+
+mbb4454:                                           ; preds = %mbb4535, %mbb3932
+  br i1 %i4530, label %mbb4535, label %mbb4531
+
+mbb4531:                                           ; preds = %mbb4454
+  ret void
+
+mbb4535:                                           ; preds = %mbb4454
+  br i1 %i4936.not, label %mbb4321, label %mbb4454
+
+mbb5291:                                           ; preds = %mbb4321
+  %i5293 = insertvalue [2 x i32] zeroinitializer, i32 %0, 1
+  store volatile [2 x i32] %i5293, ptr addrspace(5) null, align 4
+  ret void
+}