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152
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1 // PR tree-optimization/94403
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2 // Only test on some 64-bit targets which do have bswap{si,di}2 patterns and
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3 // are either big or little endian (not pdp endian).
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4 // { dg-do compile { target { lp64 && { i?86-*-* x86_64-*-* powerpc*-*-* aarch64*-*-* } } } }
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5 // { dg-require-effective-target store_merge }
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6 // { dg-options "-O2 -fdump-tree-store-merging -std=c++17" }
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7
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8 namespace std {
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9 template <typename T>
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10 void swap (T& t1, T& t2) { T tmp (t1); t1 = t2; t2 = tmp; }
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11 enum class byte : unsigned char {};
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12 }
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13
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14 unsigned
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15 bswap32 (unsigned int x)
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16 {
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17 unsigned int y = x;
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18 std::byte *bytes = reinterpret_cast<std::byte*> (&y);
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19 std::swap (bytes[0], bytes[3]);
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20 std::swap (bytes[1], bytes[2]);
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21 return y;
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22 }
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23
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24 unsigned long long
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25 bswap64 (unsigned long long x)
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26 {
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27 unsigned long long y = x;
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28 std::byte *bytes = reinterpret_cast<std::byte*> (&y);
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29 std::swap (bytes[0], bytes[7]);
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30 std::swap (bytes[1], bytes[6]);
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31 std::swap (bytes[2], bytes[5]);
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32 std::swap (bytes[3], bytes[4]);
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33 return y;
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34 }
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35
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36 /* { dg-final { scan-tree-dump-times "__builtin_bswap64" 1 "store-merging" } } */
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37 /* { dg-final { scan-tree-dump-times "__builtin_bswap32" 1 "store-merging" } } */
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