diff --git a/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll b/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll
new file mode 100644
index 000000000000..b314e59b5cb2
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll
@@ -0,0 +1,448 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+declare i3 @llvm.uadd.sat.i3(i3, i3)
+declare i8 @llvm.uadd.sat.i8(i8, i8)
+declare <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8>, <2 x i8>)
+declare <2 x i9> @llvm.uadd.sat.v2i9(<2 x i9>, <2 x i9>)
+
+declare i8 @llvm.sadd.sat.i8(i8, i8)
+declare <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8>, <2 x i8>)
+
+declare i8 @llvm.usub.sat.i8(i8, i8)
+declare i8 @llvm.ssub.sat.i8(i8, i8)
+declare <2 x i8> @llvm.usub.sat.v2i8(<2 x i8>, <2 x i8>)
+declare <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8>, <2 x i8>)
+
+define i8 @uadd_scalar_0(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_0(
+; CHECK-NEXT:    [[X1:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A:%.*]], i8 0)
+; CHECK-NEXT:    ret i8 [[X1]]
+;
+  %x1 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 0)
+  ret i8 %x1
+}
+
+define <2 x i8> @uadd_vector_0(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_0(
+; CHECK-NEXT:    [[X1V:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> zeroinitializer)
+; CHECK-NEXT:    ret <2 x i8> [[X1V]]
+;
+  %x1v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> zeroinitializer)
+  ret <2 x i8> %x1v
+}
+
+define i3 @uadd_scalar_0_commute(i3 %a) {
+; CHECK-LABEL: @uadd_scalar_0_commute(
+; CHECK-NEXT:    [[X2:%.*]] = call i3 @llvm.uadd.sat.i3(i3 0, i3 [[A:%.*]])
+; CHECK-NEXT:    ret i3 [[X2]]
+;
+  %x2 = call i3 @llvm.uadd.sat.i3(i3 0, i3 %a)
+  ret i3 %x2
+}
+
+define <2 x i8> @uadd_vector_0_commute(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_0_commute(
+; CHECK-NEXT:    [[X2V:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> <i8 0, i8 undef>, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[X2V]]
+;
+  %x2v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> <i8 0, i8 undef>, <2 x i8> %a)
+  ret <2 x i8> %x2v
+}
+
+define i8 @uadd_scalar_maxval(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_maxval(
+; CHECK-NEXT:    [[X3:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A:%.*]], i8 -1)
+; CHECK-NEXT:    ret i8 [[X3]]
+;
+  %x3 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 255)
+  ret i8 %x3
+}
+
+define <2 x i9> @uadd_vector_maxval(<2 x i9> %a) {
+; CHECK-LABEL: @uadd_vector_maxval(
+; CHECK-NEXT:    [[X3V:%.*]] = call <2 x i9> @llvm.uadd.sat.v2i9(<2 x i9> [[A:%.*]], <2 x i9> <i9 -1, i9 -1>)
+; CHECK-NEXT:    ret <2 x i9> [[X3V]]
+;
+  %x3v = call <2 x i9> @llvm.uadd.sat.v2i9(<2 x i9> %a, <2 x i9> <i9 511, i9 511>)
+  ret <2 x i9> %x3v
+}
+
+define i3 @uadd_scalar_maxval_commute(i3 %a) {
+; CHECK-LABEL: @uadd_scalar_maxval_commute(
+; CHECK-NEXT:    [[X4:%.*]] = call i3 @llvm.uadd.sat.i3(i3 -1, i3 [[A:%.*]])
+; CHECK-NEXT:    ret i3 [[X4]]
+;
+  %x4 = call i3 @llvm.uadd.sat.i3(i3 7, i3 %a)
+  ret i3 %x4
+}
+
+define <2 x i8> @uadd_vector_maxval_commute(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_maxval_commute(
+; CHECK-NEXT:    [[X4V:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> <i8 -1, i8 -1>, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[X4V]]
+;
+  %x4v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> <i8 255, i8 255>, <2 x i8> %a)
+  ret <2 x i8> %x4v
+}
+
+define i8 @uadd_scalar_undef(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_undef(
+; CHECK-NEXT:    [[X5:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[A:%.*]], i8 undef)
+; CHECK-NEXT:    ret i8 [[X5]]
+;
+  %x5 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 undef)
+  ret i8 %x5
+}
+
+define <2 x i8> @uadd_vector_undef(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_undef(
+; CHECK-NEXT:    [[X5V:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> undef)
+; CHECK-NEXT:    ret <2 x i8> [[X5V]]
+;
+  %x5v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 undef, i8 undef>)
+  ret <2 x i8> %x5v
+}
+
+define i8 @uadd_scalar_undef_commute(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_undef_commute(
+; CHECK-NEXT:    [[X6:%.*]] = call i8 @llvm.uadd.sat.i8(i8 undef, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[X6]]
+;
+  %x6 = call i8 @llvm.uadd.sat.i8(i8 undef, i8 %a)
+  ret i8 %x6
+}
+
+define <2 x i8> @uadd_vector_undef_commute(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_undef_commute(
+; CHECK-NEXT:    [[X5V:%.*]] = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> undef, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[X5V]]
+;
+  %x5v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> undef, <2 x i8> %a)
+  ret <2 x i8> %x5v
+}
+
+define i8 @sadd_scalar_0(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_0(
+; CHECK-NEXT:    [[Y1:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 0)
+; CHECK-NEXT:    ret i8 [[Y1]]
+;
+  %y1 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 0)
+  ret i8 %y1
+}
+
+define <2 x i8> @sadd_vector_0(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_0(
+; CHECK-NEXT:    [[Y1V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 undef, i8 0>)
+; CHECK-NEXT:    ret <2 x i8> [[Y1V]]
+;
+  %y1v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 undef, i8 0>)
+  ret <2 x i8> %y1v
+}
+
+define i8 @sadd_scalar_0_commute(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_0_commute(
+; CHECK-NEXT:    [[Y2:%.*]] = call i8 @llvm.sadd.sat.i8(i8 0, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[Y2]]
+;
+  %y2 = call i8 @llvm.sadd.sat.i8(i8 0, i8 %a)
+  ret i8 %y2
+}
+
+define <2 x i8> @sadd_vector_0_commute(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_0_commute(
+; CHECK-NEXT:    [[Y2V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> zeroinitializer, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[Y2V]]
+;
+  %y2v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> zeroinitializer, <2 x i8> %a)
+  ret <2 x i8> %y2v
+}
+
+define i8 @sadd_scalar_maxval(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_maxval(
+; CHECK-NEXT:    [[Y3:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 127)
+; CHECK-NEXT:    ret i8 [[Y3]]
+;
+  %y3 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 127)
+  ret i8 %y3
+}
+
+define <2 x i8> @sadd_vector_maxval(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_maxval(
+; CHECK-NEXT:    [[Y3V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 127, i8 127>)
+; CHECK-NEXT:    ret <2 x i8> [[Y3V]]
+;
+  %y3v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 127, i8 127>)
+  ret <2 x i8> %y3v
+}
+
+define i8 @sadd_scalar_maxval_commute(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_maxval_commute(
+; CHECK-NEXT:    [[Y4:%.*]] = call i8 @llvm.sadd.sat.i8(i8 127, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[Y4]]
+;
+  %y4 = call i8 @llvm.sadd.sat.i8(i8 127, i8 %a)
+  ret i8 %y4
+}
+
+define <2 x i8> @sadd_vector_maxval_commute(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_maxval_commute(
+; CHECK-NEXT:    [[Y4V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> <i8 undef, i8 127>, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[Y4V]]
+;
+  %y4v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> <i8 undef, i8 127>, <2 x i8> %a)
+  ret <2 x i8> %y4v
+}
+
+define i8 @sadd_scalar_undef(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_undef(
+; CHECK-NEXT:    [[Y5:%.*]] = call i8 @llvm.sadd.sat.i8(i8 [[A:%.*]], i8 undef)
+; CHECK-NEXT:    ret i8 [[Y5]]
+;
+  %y5 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 undef)
+  ret i8 %y5
+}
+
+define <2 x i8> @sadd_vector_undef(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_undef(
+; CHECK-NEXT:    [[Y5V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> undef)
+; CHECK-NEXT:    ret <2 x i8> [[Y5V]]
+;
+  %y5v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> undef)
+  ret <2 x i8> %y5v
+}
+
+define i8 @sadd_scalar_undef_commute(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_undef_commute(
+; CHECK-NEXT:    [[Y6:%.*]] = call i8 @llvm.sadd.sat.i8(i8 undef, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[Y6]]
+;
+  %y6 = call i8 @llvm.sadd.sat.i8(i8 undef, i8 %a)
+  ret i8 %y6
+}
+
+define <2 x i8> @sadd_vector_undef_commute(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_undef_commute(
+; CHECK-NEXT:    [[Y6V:%.*]] = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> undef, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[Y6V]]
+;
+  %y6v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> undef, <2 x i8> %a)
+  ret <2 x i8> %y6v
+}
+
+define i8 @usub_scalar_0(i8 %a) {
+; CHECK-LABEL: @usub_scalar_0(
+; CHECK-NEXT:    [[X1:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 0)
+; CHECK-NEXT:    ret i8 [[X1]]
+;
+  %x1 = call i8 @llvm.usub.sat.i8(i8 %a, i8 0)
+  ret i8 %x1
+}
+
+define <2 x i8> @usub_vector_0(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_0(
+; CHECK-NEXT:    [[X1V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> zeroinitializer)
+; CHECK-NEXT:    ret <2 x i8> [[X1V]]
+;
+  %x1v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 0, i8 0>)
+  ret <2 x i8> %x1v
+}
+
+define i8 @usub_scalar_0_commute(i8 %a) {
+; CHECK-LABEL: @usub_scalar_0_commute(
+; CHECK-NEXT:    [[X2:%.*]] = call i8 @llvm.usub.sat.i8(i8 0, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[X2]]
+;
+  %x2 = call i8 @llvm.usub.sat.i8(i8 0, i8 %a)
+  ret i8 %x2
+}
+
+define <2 x i8> @usub_vector_0_commute(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_0_commute(
+; CHECK-NEXT:    [[X2V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> zeroinitializer, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[X2V]]
+;
+  %x2v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> <i8 0, i8 0>, <2 x i8> %a)
+  ret <2 x i8> %x2v
+}
+
+define i8 @usub_scalar_maxval(i8 %a) {
+; CHECK-LABEL: @usub_scalar_maxval(
+; CHECK-NEXT:    [[X3:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 -1)
+; CHECK-NEXT:    ret i8 [[X3]]
+;
+  %x3 = call i8 @llvm.usub.sat.i8(i8 %a, i8 255)
+  ret i8 %x3
+}
+
+define <2 x i8> @usub_vector_maxval(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_maxval(
+; CHECK-NEXT:    [[X3V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 -1, i8 -1>)
+; CHECK-NEXT:    ret <2 x i8> [[X3V]]
+;
+  %x3v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 255, i8 255>)
+  ret <2 x i8> %x3v
+}
+
+define i8 @usub_scalar_undef(i8 %a) {
+; CHECK-LABEL: @usub_scalar_undef(
+; CHECK-NEXT:    [[X4:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 undef)
+; CHECK-NEXT:    ret i8 [[X4]]
+;
+  %x4 = call i8 @llvm.usub.sat.i8(i8 %a, i8 undef)
+  ret i8 %x4
+}
+
+define <2 x i8> @usub_vector_undef(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_undef(
+; CHECK-NEXT:    [[X4V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 0, i8 undef>)
+; CHECK-NEXT:    ret <2 x i8> [[X4V]]
+;
+  %x4v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 0, i8 undef>)
+  ret <2 x i8> %x4v
+}
+
+define i8 @usub_scalar_undef_commute(i8 %a) {
+; CHECK-LABEL: @usub_scalar_undef_commute(
+; CHECK-NEXT:    [[X5:%.*]] = call i8 @llvm.usub.sat.i8(i8 undef, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[X5]]
+;
+  %x5 = call i8 @llvm.usub.sat.i8(i8 undef, i8 %a)
+  ret i8 %x5
+}
+
+define <2 x i8> @usub_vector_undef_commute(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_undef_commute(
+; CHECK-NEXT:    [[X5V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> undef)
+; CHECK-NEXT:    ret <2 x i8> [[X5V]]
+;
+  %x5v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 undef, i8 undef>)
+  ret <2 x i8> %x5v
+}
+
+define i8 @usub_scalar_same(i8 %a) {
+; CHECK-LABEL: @usub_scalar_same(
+; CHECK-NEXT:    [[X6:%.*]] = call i8 @llvm.usub.sat.i8(i8 [[A:%.*]], i8 [[A]])
+; CHECK-NEXT:    ret i8 [[X6]]
+;
+  %x6 = call i8 @llvm.usub.sat.i8(i8 %a, i8 %a)
+  ret i8 %x6
+}
+
+define <2 x i8> @usub_vector_same(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_same(
+; CHECK-NEXT:    [[X6V:%.*]] = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> [[A]])
+; CHECK-NEXT:    ret <2 x i8> [[X6V]]
+;
+  %x6v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> %a)
+  ret <2 x i8> %x6v
+}
+
+define i8 @ssub_scalar_0(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_0(
+; CHECK-NEXT:    [[Y1:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[A:%.*]], i8 0)
+; CHECK-NEXT:    ret i8 [[Y1]]
+;
+  %y1 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 0)
+  ret i8 %y1
+}
+
+define <2 x i8> @ssub_vector_0(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_0(
+; CHECK-NEXT:    [[Y1V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> zeroinitializer)
+; CHECK-NEXT:    ret <2 x i8> [[Y1V]]
+;
+  %y1v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 0, i8 0>)
+  ret <2 x i8> %y1v
+}
+
+define i8 @ssub_scalar_0_commute(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_0_commute(
+; CHECK-NEXT:    [[Y2:%.*]] = call i8 @llvm.ssub.sat.i8(i8 0, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[Y2]]
+;
+  %y2 = call i8 @llvm.ssub.sat.i8(i8 0, i8 %a)
+  ret i8 %y2
+}
+
+define <2 x i8> @ssub_vector_0_commute(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_0_commute(
+; CHECK-NEXT:    [[Y2V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> zeroinitializer, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[Y2V]]
+;
+  %y2v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> <i8 0, i8 0>, <2 x i8> %a)
+  ret <2 x i8> %y2v
+}
+
+define i8 @ssub_scalar_maxval(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_maxval(
+; CHECK-NEXT:    [[Y3:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[A:%.*]], i8 127)
+; CHECK-NEXT:    ret i8 [[Y3]]
+;
+  %y3 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 127)
+  ret i8 %y3
+}
+
+define <2 x i8> @ssub_vector_maxval(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_maxval(
+; CHECK-NEXT:    [[Y3V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> <i8 127, i8 127>)
+; CHECK-NEXT:    ret <2 x i8> [[Y3V]]
+;
+  %y3v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 127, i8 127>)
+  ret <2 x i8> %y3v
+}
+
+define i8 @ssub_scalar_undef(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_undef(
+; CHECK-NEXT:    [[Y4:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[A:%.*]], i8 undef)
+; CHECK-NEXT:    ret i8 [[Y4]]
+;
+  %y4 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 undef)
+  ret i8 %y4
+}
+
+define <2 x i8> @ssub_vector_undef(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_undef(
+; CHECK-NEXT:    [[Y4V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> undef)
+; CHECK-NEXT:    ret <2 x i8> [[Y4V]]
+;
+  %y4v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> undef)
+  ret <2 x i8> %y4v
+}
+
+define i8 @ssub_scalar_undef_commute(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_undef_commute(
+; CHECK-NEXT:    [[Y5:%.*]] = call i8 @llvm.ssub.sat.i8(i8 undef, i8 [[A:%.*]])
+; CHECK-NEXT:    ret i8 [[Y5]]
+;
+  %y5 = call i8 @llvm.ssub.sat.i8(i8 undef, i8 %a)
+  ret i8 %y5
+}
+
+define <2 x i8> @ssub_vector_undef_commute(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_undef_commute(
+; CHECK-NEXT:    [[Y5V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> undef, <2 x i8> [[A:%.*]])
+; CHECK-NEXT:    ret <2 x i8> [[Y5V]]
+;
+  %y5v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> <i8 undef, i8 undef>, <2 x i8> %a)
+  ret <2 x i8> %y5v
+}
+
+define i8 @ssub_scalar_same(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_same(
+; CHECK-NEXT:    [[Y6:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[A:%.*]], i8 [[A]])
+; CHECK-NEXT:    ret i8 [[Y6]]
+;
+  %y6 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 %a)
+  ret i8 %y6
+}
+
+define <2 x i8> @ssub_vector_same(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_same(
+; CHECK-NEXT:    [[Y6V:%.*]] = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> [[A:%.*]], <2 x i8> [[A]])
+; CHECK-NEXT:    ret <2 x i8> [[Y6V]]
+;
+  %y6v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> %a)
+  ret <2 x i8> %y6v
+}
+