diff --git a/llvm/test/CodeGen/AArch64/hadd-combine.ll b/llvm/test/CodeGen/AArch64/hadd-combine.ll
new file mode 100644
index 000000000000..3de09ebcfa20
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/hadd-combine.ll
@@ -0,0 +1,728 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=aarch64-none-eabi | FileCheck %s
+
+define <8 x i16> @haddu_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: haddu_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = zext <8 x i16> %src2 to <8 x i32>
+  %add = add <8 x i32> %zextsrc1, %zextsrc2
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_const(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> %zextsrc1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>, %zextsrc1
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    ushll v1.4s, v0.4h, #0
+; CHECK-NEXT:    ushll2 v2.4s, v0.8h, #0
+; CHECK-NEXT:    shrn v0.4h, v1.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v2.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>, %zextsrc1
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_const_both() {
+; CHECK-LABEL: haddu_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #2
+; CHECK-NEXT:    ret
+  %add = add <8 x i32> <i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3>, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_const_bothhigh() {
+; CHECK-LABEL: haddu_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mvni v0.8h, #1
+; CHECK-NEXT:    ret
+  %ext1 = zext <8 x i16> <i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534> to <8 x i32>
+  %ext2 = zext <8 x i16> <i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535> to <8 x i32>
+  %add = add <8 x i32> %ext1, %ext2
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_undef(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    ushll v1.4s, v0.4h, #0
+; CHECK-NEXT:    ushll2 v2.4s, v0.8h, #0
+; CHECK-NEXT:    shrn v0.4h, v1.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v2.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = zext <8 x i16> undef to <8 x i32>
+  %add = add <8 x i32> %zextsrc2, %zextsrc1
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+
+
+define <8 x i16> @haddu_i_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: haddu_i_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> %src1, <8 x i16> %src2)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_const(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_i_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> %src1, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_i_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_i_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_const_both() {
+; CHECK-LABEL: haddu_i_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #1
+; CHECK-NEXT:    movi v1.8h, #3
+; CHECK-NEXT:    uhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_const_bothhigh() {
+; CHECK-LABEL: haddu_i_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.2d, #0xffffffffffffffff
+; CHECK-NEXT:    mvni v1.8h, #1
+; CHECK-NEXT:    uhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> <i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534>, <8 x i16> <i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @haddu_i_undef(<8 x i16> %src1) {
+; CHECK-LABEL: haddu_i_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    uhadd v0.8h, v0.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16> undef, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+
+
+
+
+define <8 x i16> @hadds_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: hadds_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = sext <8 x i16> %src2 to <8 x i32>
+  %add = add <8 x i32> %zextsrc1, %zextsrc2
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_const(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> %zextsrc1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>, %zextsrc1
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sshll v1.4s, v0.4h, #0
+; CHECK-NEXT:    sshll2 v2.4s, v0.8h, #0
+; CHECK-NEXT:    shrn v0.4h, v1.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v2.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add = add <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>, %zextsrc1
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_const_both() {
+; CHECK-LABEL: hadds_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #2
+; CHECK-NEXT:    ret
+  %add = add <8 x i32> <i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3>, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_const_bothhigh() {
+; CHECK-LABEL: hadds_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #32766
+; CHECK-NEXT:    dup v0.8h, w8
+; CHECK-NEXT:    ret
+  %ext1 = sext <8 x i16> <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766> to <8 x i32>
+  %ext2 = sext <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767> to <8 x i32>
+  %add = add <8 x i32> %ext1, %ext2
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_undef(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sshll v1.4s, v0.4h, #0
+; CHECK-NEXT:    sshll2 v2.4s, v0.8h, #0
+; CHECK-NEXT:    shrn v0.4h, v1.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v2.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = sext <8 x i16> undef to <8 x i32>
+  %add = add <8 x i32> %zextsrc2, %zextsrc1
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+
+
+define <8 x i16> @hadds_i_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: hadds_i_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> %src1, <8 x i16> %src2)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_const(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_i_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> %src1, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_i_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_i_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_const_both() {
+; CHECK-LABEL: hadds_i_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #1
+; CHECK-NEXT:    movi v1.8h, #3
+; CHECK-NEXT:    shadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_const_bothhigh() {
+; CHECK-LABEL: hadds_i_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #32766
+; CHECK-NEXT:    mvni v0.8h, #128, lsl #8
+; CHECK-NEXT:    dup v1.8h, w8
+; CHECK-NEXT:    shadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766>, <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @hadds_i_undef(<8 x i16> %src1) {
+; CHECK-LABEL: hadds_i_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    shadd v0.8h, v0.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16> undef, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+
+
+
+
+define <8 x i16> @rhaddu_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: rhaddu_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = zext <8 x i16> %src2 to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc1, %zextsrc2
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_const(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #2
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #2
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_const_both() {
+; CHECK-LABEL: rhaddu_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #2
+; CHECK-NEXT:    ret
+  %add1 = add <8 x i32> <i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3>, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_const_bothhigh() {
+; CHECK-LABEL: rhaddu_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.2d, #0xffffffffffffffff
+; CHECK-NEXT:    ret
+  %ext1 = zext <8 x i16> <i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534> to <8 x i32>
+  %ext2 = zext <8 x i16> <i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535> to <8 x i32>
+  %add1 = add <8 x i32> %ext1, %ext2
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_undef(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    uaddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    uaddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = zext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = zext <8 x i16> undef to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc2, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = lshr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+
+
+define <8 x i16> @rhaddu_i_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: rhaddu_i_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> %src1, <8 x i16> %src2)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_const(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_i_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> %src1, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_i_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_i_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_const_both() {
+; CHECK-LABEL: rhaddu_i_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #1
+; CHECK-NEXT:    movi v1.8h, #3
+; CHECK-NEXT:    urhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_const_bothhigh() {
+; CHECK-LABEL: rhaddu_i_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.2d, #0xffffffffffffffff
+; CHECK-NEXT:    mvni v1.8h, #1
+; CHECK-NEXT:    urhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> <i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534, i16 65534>, <8 x i16> <i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535, i16 65535>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhaddu_i_undef(<8 x i16> %src1) {
+; CHECK-LABEL: rhaddu_i_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    urhadd v0.8h, v0.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16> undef, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+
+
+
+
+define <8 x i16> @rhadds_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: rhadds_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = sext <8 x i16> %src2 to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc1, %zextsrc2
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_const(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #2
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #2
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %add1 = add <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_const_both() {
+; CHECK-LABEL: rhadds_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #2
+; CHECK-NEXT:    ret
+  %add1 = add <8 x i32> <i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3, i32 3>, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_const_bothhigh() {
+; CHECK-LABEL: rhadds_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mvni v0.8h, #128, lsl #8
+; CHECK-NEXT:    ret
+  %ext1 = sext <8 x i16> <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766> to <8 x i32>
+  %ext2 = sext <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767> to <8 x i32>
+  %add1 = add <8 x i32> %ext1, %ext2
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_undef(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    saddw v2.4s, v1.4s, v0.4h
+; CHECK-NEXT:    saddw2 v1.4s, v1.4s, v0.8h
+; CHECK-NEXT:    shrn v0.4h, v2.4s, #1
+; CHECK-NEXT:    shrn2 v0.8h, v1.4s, #1
+; CHECK-NEXT:    ret
+  %zextsrc1 = sext <8 x i16> %src1 to <8 x i32>
+  %zextsrc2 = sext <8 x i16> undef to <8 x i32>
+  %add1 = add <8 x i32> %zextsrc2, %zextsrc1
+  %add = add <8 x i32> %add1, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %resulti16 = ashr <8 x i32> %add, <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
+  %result = trunc <8 x i32> %resulti16 to <8 x i16>
+  ret <8 x i16> %result
+}
+
+
+
+define <8 x i16> @rhadds_i_base(<8 x i16> %src1, <8 x i16> %src2) {
+; CHECK-LABEL: rhadds_i_base:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> %src1, <8 x i16> %src2)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_const(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_i_const:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> %src1, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_const_lhs(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_i_const_lhs:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.8h, #1
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_const_zero(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_i_const_zero:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v1.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_const_both() {
+; CHECK-LABEL: rhadds_i_const_both:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v0.8h, #1
+; CHECK-NEXT:    movi v1.8h, #3
+; CHECK-NEXT:    srhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>, <8 x i16> <i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1, i16 1>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_const_bothhigh() {
+; CHECK-LABEL: rhadds_i_const_bothhigh:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #32766
+; CHECK-NEXT:    mvni v0.8h, #128, lsl #8
+; CHECK-NEXT:    dup v1.8h, w8
+; CHECK-NEXT:    srhadd v0.8h, v1.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766>, <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767>)
+  ret <8 x i16> %result
+}
+
+define <8 x i16> @rhadds_i_undef(<8 x i16> %src1) {
+; CHECK-LABEL: rhadds_i_undef:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    srhadd v0.8h, v0.8h, v0.8h
+; CHECK-NEXT:    ret
+  %result = call <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16> undef, <8 x i16> %src1)
+  ret <8 x i16> %result
+}
+
+declare <8 x i16> @llvm.aarch64.neon.uhadd.v8i16(<8 x i16>, <8 x i16>)
+declare <8 x i16> @llvm.aarch64.neon.shadd.v8i16(<8 x i16>, <8 x i16>)
+declare <8 x i16> @llvm.aarch64.neon.urhadd.v8i16(<8 x i16>, <8 x i16>)
+declare <8 x i16> @llvm.aarch64.neon.srhadd.v8i16(<8 x i16>, <8 x i16>)