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145
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1 /* PR tree-optimization/93213 - wrong code on a multibyte store with
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2 -Og -foptimize-strlen
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3 { dg-require-effective-target int128 }
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4 { dg-additional-options "-Og -foptimize-strlen" } */
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5
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6 typedef unsigned __INT16_TYPE__ u16;
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7 typedef unsigned __INT32_TYPE__ u32;
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8 typedef unsigned __int128 u128;
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9
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10 static inline u128
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11 foo (u16 u16_1, u32 u32_1, u128 u128_1)
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12 {
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13 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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14 u128 u128_0 = 0;
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15 u128_1 -= __builtin_mul_overflow (u32_1, u16_1, &u32_1);
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16 __builtin_memmove (&u16_1, &u128_0, 2);
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17 __builtin_memmove (&u16_1, &u128_1, 1);
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18 return u16_1;
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19 #else
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20 return 0xff;
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21 #endif
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22 }
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23
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24 __attribute__ ((noipa)) void
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25 bar (void)
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26 {
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27 char a[] = { 1, 2 };
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28 const char b[] = { 0, 0 };
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29 const char c[] = { 2 };
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30 __builtin_memcpy (a, b, 2);
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31 // The above is transformed into
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32 // MEM <short unsigned int> [(char * {ref-all})&a] = 0;
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33 // which was then dropped because of the non-nul store below.
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34 __builtin_memcpy (a, c, 1);
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35
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36 volatile char *p = a;
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37 if (p[0] != 2 || p[1] != 0)
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38 __builtin_abort ();
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39 }
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40
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41 int
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42 main (void)
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43 {
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44 u16 x = foo (-1, -1, 0);
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45 if (x != 0xff)
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46 __builtin_abort ();
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47
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48 bar ();
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49 return 0;
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50 }
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