97 lines
3.2 KiB
Java
97 lines
3.2 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2020, Arm Limited. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8242429
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* @summary Better implementation for sign extract.
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*
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* @run main/othervm -XX:-TieredCompilation -XX:CompileCommand=dontinline,compiler.c2.TestSignExtract::signExtract*
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* compiler.c2.TestSignExtract
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*/
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package compiler.c2;
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public class TestSignExtract {
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private static final long[] LONG_VALUES = {0L, 0xFFFFFFFFL, 0x12L, -1L, -123L, -0x12L, Long.MAX_VALUE, Long.MIN_VALUE};
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private static final int[] INT_VALUES = {0, 0x1234, -1, -0x12345678, Integer.MAX_VALUE, Integer.MIN_VALUE};
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private static int signExtractInt1(int x) {
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return (x >> 1) >>> 31;
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}
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private static int signExtractInt2(int x) {
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return (x >> 32) >>> 31;
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}
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private static int signExtractInt3(int x) {
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return (x >> 31) >>> 31;
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}
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private static int signExtractInt4(int x) {
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return 0 - (x >> 31);
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}
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private static long signExtractLong1(long x) {
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return (x >> 1) >>> 63;
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}
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private static long signExtractLong2(long x) {
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return (x >> 54) >>> 63;
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}
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private static long signExtractLong3(long x) {
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return (x >> 63) >>> 63;
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}
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private static long signExtractLong4(long x) {
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return 0 - (x >> 63);
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}
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private static int WARMUP = 5000;
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public static void main(String[] args) {
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for (int i = 0; i < WARMUP; i++) {
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for (int e : INT_VALUES) {
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// "(A >> n) >>> 31" => "(A >>> 31)"
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assert e >>> 31 == signExtractInt1(e);
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assert e >>> 31 == signExtractInt2(e);
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assert e >>> 31 == signExtractInt3(e);
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// "0 - (A >> 31)" => "(A >>> 31)"
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assert e >>> 31 == signExtractInt4(e);
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}
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for (long e : LONG_VALUES) {
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// "(A >> n) >>> 63" => "(A >>> 63)"
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assert e >>> 63 == signExtractLong1(e);
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assert e >>> 63 == signExtractLong2(e);
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assert e >>> 63 == signExtractLong3(e);
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// "0 - (A >> 63)" => "(A >>> 63)"
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assert e >>> 63 == signExtractLong4(e);
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}
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}
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}
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}
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