diff --git a/test/Transforms/CorrelatedValuePropagation/merge-range-and-undef.ll b/test/Transforms/CorrelatedValuePropagation/merge-range-and-undef.ll
new file mode 100644
index 00000000000..3e8ef5461e7
--- /dev/null
+++ b/test/Transforms/CorrelatedValuePropagation/merge-range-and-undef.ll
@@ -0,0 +1,296 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -correlated-propagation %s | FileCheck %s
+
+; Test case for PR44949.
+
+; We can remove `%res = and i64 %p, 255`, because %r = 0 and we can eliminate
+; %p as well.
+define i64 @constant_and_undef(i1 %c1, i64 %a) {
+; CHECK-LABEL: @constant_and_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 0
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    ret i64 0
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 0
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Check that we go to overdefined when merging a constant range with undef. We
+; cannot remove '%res = and i64 %p, 255'.
+; FIXME: should not remove '%res = and i64 %p, 255'
+define i64 @constant_range_and_undef(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ [[R]], [[BB2]] ]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+define i64 @constant_range_and_undef2(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[V1:%.*]] = add nuw nsw i64 undef, undef
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[V2:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[V1]], [[BB1]] ], [ [[V2]], [[BB2]] ]
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB4:%.*]], label [[BB5:%.*]]
+; CHECK:       bb4:
+; CHECK-NEXT:    br label [[BB6:%.*]]
+; CHECK:       bb5:
+; CHECK-NEXT:    [[V3:%.*]] = and i64 [[A]], 255
+; CHECK-NEXT:    br label [[BB6]]
+; CHECK:       bb6:
+; CHECK-NEXT:    [[P2:%.*]] = phi i64 [ [[P]], [[BB4]] ], [ [[V3]], [[BB5]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P2]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %v1 = add i64 undef, undef
+  br label %bb3
+
+bb2:
+  %v2 = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ %v1, %bb1 ], [ %v2, %bb2 ]
+  br i1 %c2, label %bb4, label %bb5
+
+bb4:
+  br label %bb6
+
+bb5:
+  %v3 = and i64 %a, 255
+  br label %bb6
+
+bb6:
+  %p2 = phi i64 [ %p, %bb4 ], [ %v3, %bb5 ]
+  %res = and i64 %p2, 255
+  ret i64 %res
+}
+
+define i1 @constant_range_and_undef_3(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ [[R]], [[BB2]] ]
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[P]], 256
+; CHECK-NEXT:    ret i1 [[C]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %c = icmp ult i64 %p, 256
+  ret i1 %c
+}
+
+; Same as @constant_range_and_undef, but with 3 incoming
+; values: undef, a constant and a constant range.
+define i64 @constant_range_and_undef_3_incoming_v1(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ 10, [[BB2]] ], [ undef, [[BB3]] ]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ %r, %bb1 ], [ 10, %bb2], [ undef, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Same as @constant_range_and_undef_3_incoming_v1, but with different order of
+; incoming values.
+define i64 @constant_range_and_undef_3_incoming_v2(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ 10, [[BB2]] ], [ [[R]], [[BB3]] ]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ undef, %bb1 ], [ 10, %bb2], [ %r, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Same as @constant_range_and_undef_3_incoming_v1, but with different order of
+; incoming values.
+define i64 @constant_range_and_undef_3_incoming_v3(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ undef, [[BB2]] ], [ 10, [[BB3]] ]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ %r, %bb1 ], [ undef, %bb2], [ 10, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+
+define i64 @constant_range_and_phi_constant_undef(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_phi_constant_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB5:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4:%.*]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    br label [[BB5]]
+; CHECK:       bb5:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ 10, [[BB4]] ]
+; CHECK-NEXT:    ret i64 [[P]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb5
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p.1 = phi i64 [ 10, %bb2 ], [ undef, %bb3]
+  br label %bb5
+
+bb5:
+  %p = phi i64 [ %r, %bb1 ], [ %p.1, %bb4]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
diff --git a/test/Transforms/SCCP/range-and-ip.ll b/test/Transforms/SCCP/range-and-ip.ll
new file mode 100644
index 00000000000..d3e7b2f54d3
--- /dev/null
+++ b/test/Transforms/SCCP/range-and-ip.ll
@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -ipsccp %s | FileCheck %s
+
+; Make sure IPSCCP does not assume %r < 256 for @f1. Undef is passed at a call
+; site, which won't be eliminated.
+
+define i1 @constant_and_undef(i64 %a) {
+; CHECK-LABEL: @constant_and_undef(
+; CHECK-NEXT:    [[C_1:%.*]] = call i1 @f1(i64 undef)
+; CHECK-NEXT:    br label [[BB1:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[C_2:%.*]] = call i1 @f1(i64 10)
+; CHECK-NEXT:    br label [[BB2:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[RANGE:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    [[C_3:%.*]] = call i1 @f1(i64 [[RANGE]])
+; CHECK-NEXT:    [[R_1:%.*]] = and i1 [[C_1]], [[C_2]]
+; CHECK-NEXT:    [[R_2:%.*]] = and i1 [[R_1]], [[C_3]]
+; CHECK-NEXT:    ret i1 [[R_2]]
+;
+  %c.1 = call i1 @f1(i64 undef)
+  br label %bb1
+
+bb1:
+  %c.2 = call i1 @f1(i64 10)
+  br label %bb2
+
+bb2:
+  %range = and i64 %a, 255
+  %c.3 = call i1 @f1(i64 %range)
+  %r.1 = and i1 %c.1, %c.2
+  %r.2 = and i1 %r.1, %c.3
+  ret i1 %r.2
+}
+
+declare void @sideeffect(i1, i64 %a)
+
+define internal i1 @f1(i64 %r) {
+; CHECK-LABEL: define {{.*}} @f1(
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[R:%.*]], 256
+; CHECK-NEXT:    call void @sideeffect(i1 [[C]], i64 [[R]])
+; CHECK-NEXT:    ret i1 [[C]]
+;
+  %c = icmp ult i64 %r, 256
+  call void @sideeffect(i1 %c, i64 %r)
+  ret i1 %c
+}
diff --git a/test/Transforms/SCCP/range-and.ll b/test/Transforms/SCCP/range-and.ll
new file mode 100644
index 00000000000..1ca089f4aa8
--- /dev/null
+++ b/test/Transforms/SCCP/range-and.ll
@@ -0,0 +1,396 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -sccp %s | FileCheck %s
+
+; Test case for PR44949.
+
+; We can remove `%res = and i64 %p, 255`, because %r = 0 and we can eliminate
+; %p as well.
+define i64 @constant_and_undef(i1 %c1, i64 %a) {
+; CHECK-LABEL: @constant_and_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    ret i64 0
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 0
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Check that we go to overdefined when merging a constant range with undef. We
+; cannot remove '%res = and i64 %p, 255'.
+define i64 @constant_range_and_undef(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ [[R]], [[BB2]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Same as @constant_range_and_undef, with the undef coming from the other
+; block.
+define i64 @constant_range_and_undef_switched_incoming(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_switched_incoming(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ undef, [[BB2]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb2:
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ %r, %bb1 ], [ undef, %bb2 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+define i1 @constant_range_and_255_100(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_255_100(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R_1:%.*]] = and i64 [[A:%.*]], 100
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R_2:%.*]] = and i64 [[A]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R_1]], [[BB1]] ], [ [[R_2]], [[BB2]] ]
+; CHECK-NEXT:    [[P_AND:%.*]] = and i64 [[P]], 512
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[P_AND]], 256
+; CHECK-NEXT:    ret i1 [[C]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  %r.1 = and i64 %a, 100
+  br label %bb3
+
+bb2:
+  %r.2 = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ %r.1, %bb1 ], [ %r.2, %bb2 ]
+  %p.and = and i64 %p, 512
+  %c = icmp ult i64 %p.and, 256
+  ret i1 %c
+}
+
+
+define i64 @constant_range_and_undef2(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[V1:%.*]] = add i64 undef, undef
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[V2:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[V1]], [[BB1]] ], [ [[V2]], [[BB2]] ]
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB4:%.*]], label [[BB5:%.*]]
+; CHECK:       bb4:
+; CHECK-NEXT:    br label [[BB6:%.*]]
+; CHECK:       bb5:
+; CHECK-NEXT:    [[V3:%.*]] = and i64 [[A]], 255
+; CHECK-NEXT:    br label [[BB6]]
+; CHECK:       bb6:
+; CHECK-NEXT:    [[P2:%.*]] = phi i64 [ [[P]], [[BB4]] ], [ [[V3]], [[BB5]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P2]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %v1 = add i64 undef, undef
+  br label %bb3
+
+bb2:
+  %v2 = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ %v1, %bb1 ], [ %v2, %bb2 ]
+  br i1 %c2, label %bb4, label %bb5
+
+bb4:
+  br label %bb6
+
+bb5:
+  %v3 = and i64 %a, 255
+  br label %bb6
+
+bb6:
+  %p2 = phi i64 [ %p, %bb4 ], [ %v3, %bb5 ]
+  %res = and i64 %p2, 255
+  ret i64 %res
+}
+
+define i1 @constant_range_and_undef_3(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ [[R]], [[BB2]] ]
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[P]], 256
+; CHECK-NEXT:    ret i1 [[C]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  br label %bb3
+
+bb2:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ undef, %bb1 ], [ %r, %bb2 ]
+  %c = icmp ult i64 %p, 256
+  ret i1 %c
+}
+
+define i1 @constant_range_and_undef_3_switched_incoming(i1 %cond, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_switched_incoming(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ undef, [[BB2]] ]
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[P]], 256
+; CHECK-NEXT:    ret i1 [[C]]
+;
+entry:
+  br i1 %cond, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb3
+
+bb2:
+  br label %bb3
+
+bb3:
+  %p = phi i64 [ %r, %bb1 ], [ undef, %bb2 ]
+  %c = icmp ult i64 %p, 256
+  ret i1 %c
+}
+
+; Same as @constant_range_and_undef, but with 3 incoming
+; values: undef, a constant and a constant range.
+define i64 @constant_range_and_undef_3_incoming_v1(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ 10, [[BB2]] ], [ undef, [[BB3]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ %r, %bb1 ], [ 10, %bb2], [ undef, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Same as @constant_range_and_undef_3_incoming_v1, but with different order of
+; incoming values.
+define i64 @constant_range_and_undef_3_incoming_v2(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ undef, [[BB1]] ], [ 10, [[BB2]] ], [ [[R]], [[BB3]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ undef, %bb1 ], [ 10, %bb2], [ %r, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+; Same as @constant_range_and_undef_3_incoming_v1, but with different order of
+; incoming values.
+define i64 @constant_range_and_undef_3_incoming_v3(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_undef_3_incoming_v3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB4:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ undef, [[BB2]] ], [ 10, [[BB3]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb4
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p = phi i64 [ %r, %bb1 ], [ undef, %bb2], [ 10, %bb3 ]
+  %res = and i64 %p, 255
+  ret i64 %res
+}
+
+
+define i64 @constant_range_and_phi_constant_undef(i1 %c1, i1 %c2, i64 %a) {
+; CHECK-LABEL: @constant_range_and_phi_constant_undef(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[R:%.*]] = and i64 [[A:%.*]], 255
+; CHECK-NEXT:    br label [[BB5:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 [[C2:%.*]], label [[BB3:%.*]], label [[BB4:%.*]]
+; CHECK:       bb3:
+; CHECK-NEXT:    br label [[BB4]]
+; CHECK:       bb4:
+; CHECK-NEXT:    br label [[BB5]]
+; CHECK:       bb5:
+; CHECK-NEXT:    [[P:%.*]] = phi i64 [ [[R]], [[BB1]] ], [ 10, [[BB4]] ]
+; CHECK-NEXT:    [[RES:%.*]] = and i64 [[P]], 255
+; CHECK-NEXT:    ret i64 [[RES]]
+;
+entry:
+  br i1 %c1, label %bb1, label %bb2
+
+bb1:
+  %r = and i64 %a, 255
+  br label %bb5
+
+bb2:
+  br i1 %c2, label %bb3, label %bb4
+
+bb3:
+  br label %bb4
+
+bb4:
+  %p.1 = phi i64 [ 10, %bb2 ], [ undef, %bb3]
+  br label %bb5
+
+bb5:
+  %p = phi i64 [ %r, %bb1 ], [ %p.1, %bb4]
+  %res = and i64 %p, 255
+  ret i64 %res
+}