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Add another interesting shufflevector test case for InstSimplify. NFC.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299327 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zvi Rackover 2017-04-02 10:42:21 +00:00
parent 8290bf9842
commit a544ecba50
1 changed files with 9 additions and 0 deletions
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9
test/Transforms/InstSimplify/shufflevector.ll
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@ -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