[llvm] r299327 - Add another interesting shufflevector test case for InstSimplify. NFC.

[Zvi Rackover via llvm-commits]

Author: zvi
Date: Sun Apr  2 05:42:21 2017
New Revision: 299327

URL: http://llvm.org/viewvc/llvm-project?rev=299327&view=rev
Log:
Add another interesting shufflevector test case for InstSimplify. NFC.

Test case shows opportunity to constant fold a shuffle with one variable
input vector operand.

Modified:
    llvm/trunk/test/Transforms/InstSimplify/shufflevector.ll

Modified: llvm/trunk/test/Transforms/InstSimplify/shufflevector.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstSimplify/shufflevector.ll?rev=299327&r1=299326&r2=299327&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstSimplify/shufflevector.ll (original)
+++ llvm/trunk/test/Transforms/InstSimplify/shufflevector.ll Sun Apr  2 05:42:21 2017
@@ -1,6 +1,15 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
+define <4 x i32> @const_folding(<4 x i32> %x) {
+; CHECK-LABEL: @const_folding(
+; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> zeroinitializer, <4 x i32> <i32 5, i32 4, i32 5, i32 4>
+; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
+;
+  %shuf = shufflevector <4 x i32> %x, <4 x i32> zeroinitializer, <4 x i32> <i32 5, i32 4, i32 5, i32 4>
+  ret <4 x i32> %shuf
+}
+
 define <4 x i32> @splat_operand(<4 x i32> %x) {
 ; CHECK-LABEL: @splat_operand(
 ; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> zeroinitializer