From 57a0b4edd76a2a10d1d85332e538661ee8ad2459 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Sat, 25 Aug 2018 14:37:08 +0000
Subject: [PATCH] [InstCombine] add tests for shuffle+binop transform; NFC

llvm-svn: 340683
---
 llvm/test/Transforms/InstCombine/vec_shuffle.ll | 52 +++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/llvm/test/Transforms/InstCombine/vec_shuffle.ll b/llvm/test/Transforms/InstCombine/vec_shuffle.ll
index d1a4288..17aad93 100644
--- a/llvm/test/Transforms/InstCombine/vec_shuffle.ll
+++ b/llvm/test/Transforms/InstCombine/vec_shuffle.ll
@@ -474,6 +474,58 @@ define <2 x float> @fmul_const_invalid_constant(<2 x float> %v) {
   ret <2 x float> %r
 }
 
+; TODO: Reduce the width of the binop by moving it ahead of a shuffle.
+
+define <4 x i8> @widening_shuffle_add_1(<2 x i8> %x) {
+; CHECK-LABEL: @widening_shuffle_add_1(
+; CHECK-NEXT:    [[WIDEX:%.*]] = shufflevector <2 x i8> [[X:%.*]], <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
+; CHECK-NEXT:    [[R:%.*]] = add <4 x i8> [[WIDEX]], <i8 42, i8 43, i8 44, i8 45>
+; CHECK-NEXT:    ret <4 x i8> [[R]]
+;
+  %widex = shufflevector <2 x i8> %x, <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
+  %r = add <4 x i8> %widex, <i8 42, i8 43, i8 44, i8 45>
+  ret <4 x i8> %r
+}
+
+; TODO: Reduce the width of the binop by moving it ahead of a shuffle.
+
+define <4 x i8> @widening_shuffle_add_2(<2 x i8> %x) {
+; CHECK-LABEL: @widening_shuffle_add_2(
+; CHECK-NEXT:    [[WIDEX:%.*]] = shufflevector <2 x i8> [[X:%.*]], <2 x i8> undef, <4 x i32> <i32 1, i32 0, i32 undef, i32 undef>
+; CHECK-NEXT:    [[R:%.*]] = add <4 x i8> [[WIDEX]], <i8 42, i8 43, i8 44, i8 45>
+; CHECK-NEXT:    ret <4 x i8> [[R]]
+;
+  %widex = shufflevector <2 x i8> %x, <2 x i8> undef, <4 x i32> <i32 1, i32 0, i32 undef, i32 undef>
+  %r = add <4 x i8> %widex, <i8 42, i8 43, i8 44, i8 45>
+  ret <4 x i8> %r
+}
+
+; Widening shuffles have the same mask/constant constraint as non-size-changing shuffles.
+
+define <4 x i8> @widening_shuffle_add_invalid_constant(<2 x i8> %x) {
+; CHECK-LABEL: @widening_shuffle_add_invalid_constant(
+; CHECK-NEXT:    [[WIDEX:%.*]] = shufflevector <2 x i8> [[X:%.*]], <2 x i8> undef, <4 x i32> <i32 1, i32 1, i32 undef, i32 undef>
+; CHECK-NEXT:    [[R:%.*]] = add <4 x i8> [[WIDEX]], <i8 42, i8 43, i8 44, i8 45>
+; CHECK-NEXT:    ret <4 x i8> [[R]]
+;
+  %widex = shufflevector <2 x i8> %x, <2 x i8> undef, <4 x i32> <i32 1, i32 1, i32 undef, i32 undef>
+  %r = add <4 x i8> %widex, <i8 42, i8 43, i8 44, i8 45>
+  ret <4 x i8> %r
+}
+
+; And widening shuffles have an additional constraint - they must not extend with anything but undefs.
+
+define <4 x i8> @widening_shuffle_add_invalid_mask(<2 x i8> %x) {
+; CHECK-LABEL: @widening_shuffle_add_invalid_mask(
+; CHECK-NEXT:    [[WIDEX:%.*]] = shufflevector <2 x i8> [[X:%.*]], <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 0>
+; CHECK-NEXT:    [[R:%.*]] = add <4 x i8> [[WIDEX]], <i8 42, i8 43, i8 44, i8 45>
+; CHECK-NEXT:    ret <4 x i8> [[R]]
+;
+  %widex = shufflevector <2 x i8> %x, <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 0>
+  %r = add <4 x i8> %widex, <i8 42, i8 43, i8 44, i8 45>
+  ret <4 x i8> %r
+}
+
 define <4 x i32> @shuffle_17add2(<4 x i32> %v) {
 ; CHECK-LABEL: @shuffle_17add2(
 ; CHECK-NEXT:    [[TMP1:%.*]] = shl <4 x i32> [[V:%.*]], <i32 1, i32 1, i32 1, i32 1>
-- 
2.7.4