diff --git a/llvm/test/CodeGen/LoongArch/bytepick.ll b/llvm/test/CodeGen/LoongArch/bytepick.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/LoongArch/bytepick.ll
@@ -0,0 +1,317 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch32 --verify-machineinstrs < %s \
+; RUN:   | FileCheck %s --check-prefix=LA32
+; RUN: llc --mtriple=loongarch64 --verify-machineinstrs < %s \
+; RUN:   | FileCheck %s --check-prefix=LA64
+
+;; a=00112233 b=44556677
+;; expected 11223344
+define i32 @pick_i32_1(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_1:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 8
+; LA32-NEXT:    srli.w $a1, $a1, 24
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_1:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 8
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 24
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 24
+  %2 = shl i32 %a, 8
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=00112233 b=44556677
+;; expected 11223344
+define signext i32 @pick_i32_1_sext(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_1_sext:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 8
+; LA32-NEXT:    srli.w $a1, $a1, 24
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_1_sext:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 8
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 24
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 24
+  %2 = shl i32 %a, 8
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=00112233 b=44556677
+;; expected 22334455
+define i32 @pick_i32_2(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_2:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 16
+; LA32-NEXT:    srli.w $a1, $a1, 16
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_2:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 16
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 16
+  %2 = shl i32 %a, 16
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=00112233 b=44556677
+;; expected 22334455
+define signext i32 @pick_i32_2_sext(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_2_sext:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 16
+; LA32-NEXT:    srli.w $a1, $a1, 16
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_2_sext:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 16
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 16
+  %2 = shl i32 %a, 16
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=00112233 b=44556677
+;; expected 33445566
+define i32 @pick_i32_3(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_3:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 24
+; LA32-NEXT:    srli.w $a1, $a1, 8
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_3:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 24
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 8
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 8
+  %2 = shl i32 %a, 24
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=00112233 b=44556677
+;; expected 33445566
+define signext i32 @pick_i32_3_sext(i32 %a, i32 %b) {
+; LA32-LABEL: pick_i32_3_sext:
+; LA32:       # %bb.0:
+; LA32-NEXT:    slli.w $a0, $a0, 24
+; LA32-NEXT:    srli.w $a1, $a1, 8
+; LA32-NEXT:    or $a0, $a1, $a0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i32_3_sext:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 24
+; LA64-NEXT:    bstrpick.d $a1, $a1, 31, 8
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    ret
+  %1 = lshr i32 %b, 8
+  %2 = shl i32 %a, 24
+  %3 = or i32 %1, %2
+  ret i32 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 1122334455667788
+define i64 @pick_i64_1(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_1:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a2, $a3, 24
+; LA32-NEXT:    slli.w $a3, $a0, 8
+; LA32-NEXT:    or $a2, $a2, $a3
+; LA32-NEXT:    srli.w $a0, $a0, 24
+; LA32-NEXT:    slli.w $a1, $a1, 8
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_1:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 8
+; LA64-NEXT:    srli.d $a1, $a1, 56
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 56
+  %2 = shl i64 %a, 8
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 2233445566778899
+define i64 @pick_i64_2(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_2:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a2, $a3, 16
+; LA32-NEXT:    slli.w $a3, $a0, 16
+; LA32-NEXT:    or $a2, $a2, $a3
+; LA32-NEXT:    srli.w $a0, $a0, 16
+; LA32-NEXT:    slli.w $a1, $a1, 16
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_2:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    srli.d $a1, $a1, 48
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 48
+  %2 = shl i64 %a, 16
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 33445566778899aa
+define i64 @pick_i64_3(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_3:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a2, $a3, 8
+; LA32-NEXT:    slli.w $a3, $a0, 24
+; LA32-NEXT:    or $a2, $a2, $a3
+; LA32-NEXT:    srli.w $a0, $a0, 8
+; LA32-NEXT:    slli.w $a1, $a1, 24
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_3:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 24
+; LA64-NEXT:    srli.d $a1, $a1, 40
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 40
+  %2 = shl i64 %a, 24
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 445566778899aabb
+define i64 @pick_i64_4(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_4:
+; LA32:       # %bb.0:
+; LA32-NEXT:    move $a1, $a0
+; LA32-NEXT:    move $a0, $a3
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_4:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 32
+; LA64-NEXT:    srli.d $a1, $a1, 32
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 32
+  %2 = shl i64 %a, 32
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 5566778899aabbcc
+define i64 @pick_i64_5(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_5:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a1, $a2, 24
+; LA32-NEXT:    slli.w $a2, $a3, 8
+; LA32-NEXT:    or $a2, $a1, $a2
+; LA32-NEXT:    slli.w $a0, $a0, 8
+; LA32-NEXT:    srli.w $a1, $a3, 24
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_5:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 40
+; LA64-NEXT:    srli.d $a1, $a1, 24
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 24
+  %2 = shl i64 %a,40
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 66778899aabbccdd
+define i64 @pick_i64_6(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_6:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a1, $a2, 16
+; LA32-NEXT:    slli.w $a2, $a3, 16
+; LA32-NEXT:    or $a2, $a1, $a2
+; LA32-NEXT:    slli.w $a0, $a0, 16
+; LA32-NEXT:    srli.w $a1, $a3, 16
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_6:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 48
+; LA64-NEXT:    srli.d $a1, $a1, 16
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 16
+  %2 = shl i64 %a, 48
+  %3 = or i64 %1, %2
+  ret i64 %3
+}
+
+;; a=0011223344556677 b=8899aabbccddeeff
+;; expected 778899aabbccddee
+define i64 @pick_i64_7(i64 %a, i64 %b) {
+; LA32-LABEL: pick_i64_7:
+; LA32:       # %bb.0:
+; LA32-NEXT:    srli.w $a1, $a2, 8
+; LA32-NEXT:    slli.w $a2, $a3, 24
+; LA32-NEXT:    or $a2, $a1, $a2
+; LA32-NEXT:    slli.w $a0, $a0, 24
+; LA32-NEXT:    srli.w $a1, $a3, 8
+; LA32-NEXT:    or $a1, $a1, $a0
+; LA32-NEXT:    move $a0, $a2
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: pick_i64_7:
+; LA64:       # %bb.0:
+; LA64-NEXT:    slli.d $a0, $a0, 56
+; LA64-NEXT:    srli.d $a1, $a1, 8
+; LA64-NEXT:    or $a0, $a1, $a0
+; LA64-NEXT:    ret
+  %1 = lshr i64 %b, 8
+  %2 = shl i64 %a, 56
+  %3 = or i64 %1, %2
+  ret i64 %3
+}