08e40c12fa
Reapply #147854 after fixes merged in #151398. Change memory access histogram storage from uint64_t to uint16_t to reduce profile size on disk. This change updates the raw profile format to v5. Also add a histogram test in compiler-rt since we didn't have one before. With this change the histogram memprof raw for the basic test reduces from 75KB -> 20KB.
36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
#include <cstdint>
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#include <vector>
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#include "profile/MemProfData.inc"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace memprof {
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namespace {
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TEST(MemProf, F16EncodeDecode) {
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const std::vector<uint64_t> TestCases = {
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0, 100, 4095, 4096, 5000, 8191, 65535, 1000000, 134213640, 200000000,
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};
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for (const uint64_t TestCase : TestCases) {
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const uint16_t Encoded = encodeHistogramCount(TestCase);
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const uint64_t Decoded = decodeHistogramCount(Encoded);
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const uint64_t MaxRepresentable = static_cast<uint64_t>(MaxMantissa)
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<< MaxExponent;
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if (TestCase >= MaxRepresentable) {
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EXPECT_EQ(Decoded, MaxRepresentable);
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} else if (TestCase <= MaxMantissa) {
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EXPECT_EQ(Decoded, TestCase);
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} else {
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// The decoded value should be close to the original value.
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// The error should be less than 1/1024 for larger numbers.
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EXPECT_NEAR(Decoded, TestCase, static_cast<double>(TestCase) / 1024.0);
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}
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}
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}
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} // namespace
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} // namespace memprof
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} // namespace llvm
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