[NFC][PowerPC] Patch to add the remaining types v2i64, v8i16 and v16i8 into exisiting testfile (#163201)

The previous [NFC
patch](#160476 (comment)) addressed
only the vector type `v4i32`, this is a continuation for the previous
patch which adds the remaining 3 vector types which were left out.

This should include the following operands:
- `v2i64`: `A + vector {1, 1,}`
- `v8i16`: `A + vector {1, 1, 1, 1, 1, 1, 1, 1}`
- `v16i8`: `A + vector {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}`

---------

Co-authored-by: himadhith <[email protected]>

Author: Himadhith

llvm/test/CodeGen/PowerPC/addition-vector-all-ones.ll

@@ -0,0 +1,60 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc -verify-machineinstrs -O3 -mcpu=pwr9 -mtriple=powerpc64le-unknown-linux-gnu \
+; RUN:     -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; RUN: llc -verify-machineinstrs -O3 -mcpu=pwr9 -mtriple=powerpc64-ibm-aix \
+; RUN:     -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; RUN: llc -verify-machineinstrs -O3 -mcpu=pwr9 -mtriple=powerpc-ibm-aix \
+; RUN:     -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; The addition of vector `A` with vector of 1s currently uses `vspltisw` to generate vector of 1s followed by add operation.
+
+; Function for the vector type v2i64 `a + {1, 1}`
+define <2 x i64> @test_v2i64(<2 x i64> %a) {
+; CHECK-LABEL: test_v2i64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vspltisw v3, 1
+; CHECK-NEXT:    vupklsw v3, v3
+; CHECK-NEXT:    vaddudm v2, v2, v3
+; CHECK-NEXT:    blr
+entry:
+  %add = add <2 x i64> %a, splat (i64 1)
+  ret <2 x i64> %add
+}
+
+; Function for the vector type v4i32 `a + {1, 1, 1, 1}`
+define <4 x i32> @test_v4i32(<4 x i32> %a) {
+; CHECK-LABEL: test_v4i32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vspltisw v3, 1
+; CHECK-NEXT:    vadduwm v2, v2, v3
+; CHECK-NEXT:    blr
+entry:
+  %add = add <4 x i32> %a, splat (i32 1)
+  ret <4 x i32> %add
+}
+
+; Function for the vector type v8i16 `a + {1, 1, 1, 1, 1, 1, 1, 1}`
+define <8 x i16> @test_v8i16(<8 x i16> %a) {
+; CHECK-LABEL: test_v8i16:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vspltish v3, 1
+; CHECK-NEXT:    vadduhm v2, v2, v3
+; CHECK-NEXT:    blr
+entry:
+  %add = add <8 x i16> %a, splat (i16 1)
+  ret <8 x i16> %add
+}
+
+; Function for the vector type v16i8 `a + {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}`
+define <16 x i8> @test_16i8(<16 x i8> %a) {
+; CHECK-LABEL: test_16i8:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xxspltib v3, 1
+; CHECK-NEXT:    vaddubm v2, v2, v3
+; CHECK-NEXT:    blr
+entry:
+  %add = add <16 x i8> %a, splat (i8 1)
+  ret <16 x i8> %add
+}