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/*
* Copyright (c) 2023, 2024, 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 8287087
* @summary Test reduction vectorizations that are enabled by performing SLP
* reduction analysis on unrolled loops.
* @library /test/lib /
* @run driver compiler.loopopts.superword.TestGeneralizedReductions
*/
package compiler.loopopts.superword;
import compiler.lib.ir_framework.*;
import jdk.test.lib.Asserts;
public class TestGeneralizedReductions {
private static int acc = 0;
public static void main(String[] args) throws Exception {
// Fix maximum number of unrolls for test stability.
TestFramework.runWithFlags("-XX:+IgnoreUnrecognizedVMOptions", "-XX:LoopMaxUnroll=16");
}
@Run(test = {"testReductionOnGlobalAccumulator",
"testReductionOnPartiallyUnrolledLoop",
"testReductionOnLargePartiallyUnrolledLoop",
"testReductionOnPartiallyUnrolledLoopWithSwappedInputs",
"testMapReductionOnGlobalAccumulator"})
void run() {
long[] array = new long[128];
long result;
initArray(array);
result = testReductionOnGlobalAccumulator(array);
Asserts.assertEQ(result, 8128L, "unexpected result");
initArray(array);
result = testReductionOnPartiallyUnrolledLoop(array);
Asserts.assertEQ(result, 8128L, "unexpected result");
initArray(array);
result = testReductionOnLargePartiallyUnrolledLoop(array);
Asserts.assertEQ(result, 8128L, "unexpected result");
initArray(array);
result = testReductionOnPartiallyUnrolledLoopWithSwappedInputs(array);
Asserts.assertEQ(result, 8128L, "unexpected result");
initArray(array);
result = testMapReductionOnGlobalAccumulator(array);
Asserts.assertEQ(result, 448L, "unexpected result");
}
private static void initArray(long[] array) {
for (int i = 0; i < array.length; i++) {
array[i] = i;
}
}
@Test
@IR(applyIfCPUFeatureOr = {"avx2", "true", "rvv", "true"},
applyIf = {"SuperWordReductions", "true"},
applyIfPlatform = {"64-bit", "true"},
counts = {IRNode.ADD_REDUCTION_VI, ">= 1"})
private static long testReductionOnGlobalAccumulator(long[] array) {
acc = 0;
for (int i = 0; i < array.length; i++) {
acc += array[i];
}
return acc;
}
@Test
@IR(applyIfCPUFeatureOr = {"avx2", "true", "rvv", "true"},
applyIf = {"SuperWordReductions", "true"},
applyIfPlatform = {"64-bit", "true"},
counts = {IRNode.ADD_REDUCTION_VI, ">= 1"})
private static long testReductionOnPartiallyUnrolledLoop(long[] array) {
int sum = 0;
for (int i = 0; i < array.length / 2; i++) {
sum += array[2*i];
sum += array[2*i + 1];
}
return sum;
}
@Test
@IR(applyIfCPUFeatureOr = {"avx2", "true", "rvv", "true"},
applyIf = {"SuperWordReductions", "true"},
applyIfPlatform = {"64-bit", "true"},
counts = {IRNode.ADD_REDUCTION_VI, ">= 1"})
private static long testReductionOnLargePartiallyUnrolledLoop(long[] array) {
int sum = 0;
for (int i = 0; i < array.length / 8; i++) {
sum += array[8*i];
sum += array[8*i + 1];
sum += array[8*i + 2];
sum += array[8*i + 3];
sum += array[8*i + 4];
sum += array[8*i + 5];
sum += array[8*i + 6];
sum += array[8*i + 7];
}
return sum;
}
// This test illustrates a limitation of the current reduction analysis: it
// fails to detect reduction cycles where nodes are connected via different
// input indices (except if the differences result from C2 edge swapping).
// If this limitation is overcome in the future, the test case should be
// turned into a positive one.
@Test
@IR(applyIfCPUFeatureOr = {"avx2", "true", "rvv", "true"},
applyIf = {"SuperWordReductions", "true"},
applyIfPlatform = {"64-bit", "true"},
failOn = {IRNode.ADD_REDUCTION_VI})
private static long testReductionOnPartiallyUnrolledLoopWithSwappedInputs(long[] array) {
int sum = 0;
for (int i = 0; i < array.length / 2; i++) {
sum = sum + (int)array[2*i];
sum = (int)array[2*i + 1] + sum;
}
return sum;
}
@Test
@IR(applyIfCPUFeatureOr = {"avx2", "true"},
applyIfAnd = {"SuperWordReductions", "true","UsePopCountInstruction", "true"},
applyIfPlatform = {"64-bit", "true"},
counts = {IRNode.ADD_REDUCTION_VI, ">= 1",
IRNode.POPCOUNT_VL, ">= 1"})
@IR(applyIfPlatform = {"riscv64", "true"},
applyIfCPUFeatureOr = {"zvbb", "true"},
applyIfAnd = {"SuperWordReductions", "true","UsePopCountInstruction", "true"},
counts = {IRNode.ADD_REDUCTION_VI, ">= 1",
IRNode.POPCOUNT_VL, ">= 1"})
private static long testMapReductionOnGlobalAccumulator(long[] array) {
acc = 0;
for (int i = 0; i < array.length; i++) {
acc += Long.bitCount(array[i]);
}
return acc;
}
}
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