| 1 | //===-- Test for the shuffle operations on the GPU ------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/__support/CPP/bit.h" |
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| 10 | #include "src/__support/GPU/utils.h" |
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| 11 | #include "test/IntegrationTest/test.h" |
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| 12 | |
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| 13 | using namespace LIBC_NAMESPACE; |
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| 14 | |
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| 15 | // Test to make sure the shuffle instruction works by doing a simple broadcast. |
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| 16 | // Each iteration reduces the width, so it will broadcast to a subset we check. |
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| 17 | static void test_shuffle() { |
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| 18 | uint64_t mask = gpu::get_lane_mask(); |
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| 19 | EXPECT_EQ(cpp::popcount(mask), gpu::get_lane_size()); |
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| 20 | |
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| 21 | uint32_t x = gpu::get_lane_id(); |
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| 22 | for (uint32_t width = gpu::get_lane_size(); width > 0; width /= 2) |
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| 23 | EXPECT_EQ(gpu::shuffle(mask, 0, x, width), (x / width) * width); |
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| 24 | } |
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| 25 | |
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| 26 | TEST_MAIN(int argc, char **argv, char **envp) { |
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| 27 | if (gpu::get_thread_id() >= gpu::get_lane_size()) |
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| 28 | return 0; |
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| 29 | |
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| 30 | test_shuffle(); |
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| 31 | |
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| 32 | return 0; |
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| 33 | } |
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| 34 | |
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