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8259353: VectorReinterpretNode is incorrectly optimized out

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Reviewed-by: vlivanov, njian
This commit is contained in:
Xiaohong Gong 2021-01-13 05:48:08 +00:00 committed by Ningsheng Jian
parent 17b4db31cb
commit 1cf2378bda
1 changed files with 6 additions and 2 deletions
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8
src/hotspot/share/opto/vectornode.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2007, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1198,7 +1198,11 @@ void VectorMaskCmpNode::dump_spec(outputStream *st) const {
Node* VectorReinterpretNode::Identity(PhaseGVN *phase) {
Node* n = in(1);
if (n->Opcode() == Op_VectorReinterpret) {
if (Type::cmp(bottom_type(), n->in(1)->bottom_type()) == 0) {
// "VectorReinterpret (VectorReinterpret node) ==> node" if:
// 1) Types of 'node' and 'this' are identical
// 2) Truncations are not introduced by the first VectorReinterpret
if (Type::cmp(bottom_type(), n->in(1)->bottom_type()) == 0 &&
length_in_bytes() <= n->bottom_type()->is_vect()->length_in_bytes()) {
return n->in(1);
}
}