diff --git a/llvm/test/Analysis/ValueTracking/knownbits-div.ll b/llvm/test/Analysis/ValueTracking/knownbits-div.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Analysis/ValueTracking/knownbits-div.ll
@@ -0,0 +1,269 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=instsimplify -S < %s | FileCheck %s
+
+define i1 @sdiv_neg_neg_high_bits(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_neg_neg_high_bits(
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[X:%.*]], -128
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], -125
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], -128
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = or i8 %x, 128
+  %denum = or i8 %y, 131
+  %div = sdiv i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 128
+  ret i1 %r
+}
+
+define i1 @sdiv_pos_neg_high_bits(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_pos_neg_high_bits(
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[X:%.*]], 127
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[XX]], 49
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], -15
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %xx = and i8 %x, 127
+  %num = or i8 %xx, 49
+  %denum = or i8 %y, 241
+  %div = sdiv i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_pos_neg_high_bits_fail_maybez(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_pos_neg_high_bits_fail_maybez(
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[X:%.*]], 127
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[XX]], 49
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], -64
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %xx = and i8 %x, 127
+  %num = or i8 %xx, 49
+  %denum = or i8 %y, 192
+  %div = sdiv i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_exact_pos_neg_high_bits(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_exact_pos_neg_high_bits(
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[X:%.*]], 127
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[XX]], 49
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], -64
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %xx = and i8 %x, 127
+  %num = or i8 %xx, 49
+  %denum = or i8 %y, 192
+  %div = sdiv exact i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_neg_pos_high_bits(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_neg_pos_high_bits(
+; CHECK-NEXT:    [[XX:%.*]] = and i8 [[X:%.*]], -97
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[XX]], -127
+; CHECK-NEXT:    [[YY:%.*]] = and i8 [[Y:%.*]], 15
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[YY]], 9
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %xx = and i8 %x, 159
+  %num = or i8 %xx, 129
+  %yy = and i8 %y, 15
+  %denum = or i8 %yy, 9
+  %div = sdiv i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_neg_pos_high_bits_fail_maybez(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_neg_pos_high_bits_fail_maybez(
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[X:%.*]], -128
+; CHECK-NEXT:    [[YY:%.*]] = and i8 [[Y:%.*]], 15
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[YY]], 9
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], -128
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = or i8 %x, 128
+  %yy = and i8 %y, 15
+  %denum = or i8 %yy, 9
+  %div = sdiv i8 %num, %denum
+  %and = and i8 %div, 128
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_exact_odd_odd(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_exact_odd_odd(
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[X:%.*]], 1
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], 1
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = or i8 %x, 1
+  %denum = or i8 %y, 1
+  %div = sdiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @sdiv_exact_even_odd(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_exact_even_odd(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], 1
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = or i8 %y, 1
+  %div = sdiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 1
+  ret i1 %r
+}
+
+define i1 @sdiv_exact_even_even_fail_unknown(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_exact_even_even_fail_unknown(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = and i8 [[Y:%.*]], -2
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = and i8 %y, -2
+  %div = sdiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 1
+  ret i1 %r
+}
+
+define i1 @sdiv_exact_even_even_fail_unknown2(i8 %x, i8 %y) {
+; CHECK-LABEL: @sdiv_exact_even_even_fail_unknown2(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = and i8 [[Y:%.*]], -2
+; CHECK-NEXT:    [[DIV:%.*]] = sdiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = and i8 %y, -2
+  %div = sdiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @udiv_high_bits(i8 %x, i8 %y) {
+; CHECK-LABEL: @udiv_high_bits(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -127
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], 31
+; CHECK-NEXT:    [[DIV:%.*]] = udiv i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 8
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 8
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, 129
+  %denum = or i8 %y, 31
+  %div = udiv i8 %num, %denum
+  %and = and i8 %div, 8
+  %r = icmp eq i8 %and, 8
+  ret i1 %r
+}
+
+define i1 @udiv_exact_odd_odd(i8 %x, i8 %y) {
+; CHECK-LABEL: @udiv_exact_odd_odd(
+; CHECK-NEXT:    [[NUM:%.*]] = or i8 [[X:%.*]], 1
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], 1
+; CHECK-NEXT:    [[DIV:%.*]] = udiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = or i8 %x, 1
+  %denum = or i8 %y, 1
+  %div = udiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}
+
+define i1 @udiv_exact_even_odd(i8 %x, i8 %y) {
+; CHECK-LABEL: @udiv_exact_even_odd(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = or i8 [[Y:%.*]], 1
+; CHECK-NEXT:    [[DIV:%.*]] = udiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = or i8 %y, 1
+  %div = udiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 1
+  ret i1 %r
+}
+
+define i1 @udiv_exact_even_even_fail_unknown(i8 %x, i8 %y) {
+; CHECK-LABEL: @udiv_exact_even_even_fail_unknown(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = and i8 [[Y:%.*]], -2
+; CHECK-NEXT:    [[DIV:%.*]] = udiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = and i8 %y, -2
+  %div = udiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 1
+  ret i1 %r
+}
+
+define i1 @udiv_exact_even_even_fail_unknown2(i8 %x, i8 %y) {
+; CHECK-LABEL: @udiv_exact_even_even_fail_unknown2(
+; CHECK-NEXT:    [[NUM:%.*]] = and i8 [[X:%.*]], -2
+; CHECK-NEXT:    [[DENUM:%.*]] = and i8 [[Y:%.*]], -2
+; CHECK-NEXT:    [[DIV:%.*]] = udiv exact i8 [[NUM]], [[DENUM]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[DIV]], 1
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[AND]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %num = and i8 %x, -2
+  %denum = and i8 %y, -2
+  %div = udiv exact i8 %num, %denum
+  %and = and i8 %div, 1
+  %r = icmp eq i8 %and, 0
+  ret i1 %r
+}