From 0a1c1b20e260bb44dc679353bc8e6feb7fce7ab2 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Fri, 20 Jan 2017 11:28:07 +0000
Subject: [PATCH] [InstCombine][SSE] Tests showing missed opportunities to
 handle packss/packus with undef arguments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292601 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/x86-pack.ll | 76 +++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/test/Transforms/InstCombine/x86-pack.ll b/test/Transforms/InstCombine/x86-pack.ll
index 88149b14d62..db546685927 100644
--- a/test/Transforms/InstCombine/x86-pack.ll
+++ b/test/Transforms/InstCombine/x86-pack.ll
@@ -1,6 +1,82 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 
+;
+; UNDEF Elts
+;
+
+define <8 x i16> @undef_packssdw_128() {
+; CHECK-LABEL: @undef_packssdw_128(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <8 x i16> @llvm.x86.sse2.packssdw.128(<4 x i32> undef, <4 x i32> undef)
+; CHECK-NEXT:    ret <8 x i16> [[TMP1]]
+;
+  %1 = call <8 x i16> @llvm.x86.sse2.packssdw.128(<4 x i32> undef, <4 x i32> undef)
+  ret <8 x i16> %1
+}
+
+define <8 x i16> @undef_packusdw_128() {
+; CHECK-LABEL: @undef_packusdw_128(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <8 x i16> @llvm.x86.sse41.packusdw(<4 x i32> undef, <4 x i32> undef)
+; CHECK-NEXT:    ret <8 x i16> [[TMP1]]
+;
+  %1 = call <8 x i16> @llvm.x86.sse41.packusdw(<4 x i32> undef, <4 x i32> undef)
+  ret <8 x i16> %1
+}
+
+define <16 x i8> @undef_packsswb_128() {
+; CHECK-LABEL: @undef_packsswb_128(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <16 x i8> @llvm.x86.sse2.packsswb.128(<8 x i16> undef, <8 x i16> undef)
+; CHECK-NEXT:    ret <16 x i8> [[TMP1]]
+;
+  %1 = call <16 x i8> @llvm.x86.sse2.packsswb.128(<8 x i16> undef, <8 x i16> undef)
+  ret <16 x i8> %1
+}
+
+define <16 x i8> @undef_packuswb_128() {
+; CHECK-LABEL: @undef_packuswb_128(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <16 x i8> @llvm.x86.sse2.packuswb.128(<8 x i16> undef, <8 x i16> undef)
+; CHECK-NEXT:    ret <16 x i8> [[TMP1]]
+;
+  %1 = call <16 x i8> @llvm.x86.sse2.packuswb.128(<8 x i16> undef, <8 x i16> undef)
+  ret <16 x i8> %1
+}
+
+define <16 x i16> @undef_packssdw_256() {
+; CHECK-LABEL: @undef_packssdw_256(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <16 x i16> @llvm.x86.avx2.packssdw(<8 x i32> undef, <8 x i32> undef)
+; CHECK-NEXT:    ret <16 x i16> [[TMP1]]
+;
+  %1 = call <16 x i16> @llvm.x86.avx2.packssdw(<8 x i32> undef, <8 x i32> undef)
+  ret <16 x i16> %1
+}
+
+define <16 x i16> @undef_packusdw_256() {
+; CHECK-LABEL: @undef_packusdw_256(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <16 x i16> @llvm.x86.avx2.packusdw(<8 x i32> undef, <8 x i32> undef)
+; CHECK-NEXT:    ret <16 x i16> [[TMP1]]
+;
+  %1 = call <16 x i16> @llvm.x86.avx2.packusdw(<8 x i32> undef, <8 x i32> undef)
+  ret <16 x i16> %1
+}
+
+define <32 x i8> @undef_packsswb_256() {
+; CHECK-LABEL: @undef_packsswb_256(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <32 x i8> @llvm.x86.avx2.packsswb(<16 x i16> undef, <16 x i16> undef)
+; CHECK-NEXT:    ret <32 x i8> [[TMP1]]
+;
+  %1 = call <32 x i8> @llvm.x86.avx2.packsswb(<16 x i16> undef, <16 x i16> undef)
+  ret <32 x i8> %1
+}
+
+define <32 x i8> @undef_packuswb_256() {
+; CHECK-LABEL: @undef_packuswb_256(
+; CHECK-NEXT:    [[TMP1:%.*]] = call <32 x i8> @llvm.x86.avx2.packuswb(<16 x i16> undef, <16 x i16> undef)
+; CHECK-NEXT:    ret <32 x i8> [[TMP1]]
+;
+  %1 = call <32 x i8> @llvm.x86.avx2.packuswb(<16 x i16> undef, <16 x i16> undef)
+  ret <32 x i8> %1
+}
+
 ;
 ; Demanded Elts
 ;
-- 
2.50.1