110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* { dg-do run } */
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/* { dg-options "-O2 -fdump-tree-optimized" } */
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/* MUL_OVERFLOW should not be folded into unsigned multiplication,
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because it sometimes overflows and sometimes does not. */
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__attribute__((noinline, noclone)) long int
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fn1 (long int x, long int y, int *ovf)
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{
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long int res;
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x &= 65535;
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y = (y & 65535) - (__LONG_MAX__ / 65535 + 32768);
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*ovf = __builtin_mul_overflow (x, y, &res);
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return res;
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}
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/* MUL_OVERFLOW should not be folded into unsigned multiplication,
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because it sometimes overflows and sometimes does not. */
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__attribute__((noinline, noclone)) signed char
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fn2 (long int x, long int y, int *ovf)
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{
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signed char res;
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x = (x & 63) + (__SCHAR_MAX__ / 4);
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y = (y & 3) + 4;
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*ovf = __builtin_mul_overflow (x, y, &res);
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return res;
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}
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/* ADD_OVERFLOW should be folded into unsigned additrion,
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because it sometimes overflows and sometimes does not. */
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__attribute__((noinline, noclone)) unsigned char
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fn3 (unsigned char x, unsigned char y, int *ovf)
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{
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unsigned char res;
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x = (x & 63) + ((unsigned char) ~0 - 65);
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y = (y & 3);
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*ovf = __builtin_add_overflow (x, y, &res);
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return res;
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}
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/* ADD_OVERFLOW should be folded into unsigned additrion,
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because it sometimes overflows and sometimes does not. */
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__attribute__((noinline, noclone)) unsigned char
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fn4 (unsigned char x, unsigned char y, int *ovf)
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{
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unsigned char res;
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x = (x & 15) + ((unsigned char) ~0 - 16);
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y = (y & 3) + 16;
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*ovf = __builtin_add_overflow (x, y, &res);
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return res;
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}
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/* MUL_OVERFLOW should not be folded into unsigned multiplication,
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because it sometimes overflows and sometimes does not. */
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__attribute__((noinline, noclone)) long int
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fn5 (long int x, unsigned long int y, int *ovf)
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{
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long int res;
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y = -65536UL + (y & 65535);
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*ovf = __builtin_mul_overflow (x, y, &res);
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return res;
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}
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int
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main ()
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{
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int ovf;
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if (fn1 (0, 0, &ovf) != 0
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|| ovf
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|| fn1 (65535, 0, &ovf) != (long int) ((__LONG_MAX__ / 65535 + 32768UL) * -65535UL)
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|| !ovf)
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__builtin_abort ();
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if (fn2 (0, 0, &ovf) != (signed char) (__SCHAR_MAX__ / 4 * 4U)
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|| ovf
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|| fn2 (0, 1, &ovf) != (signed char) (__SCHAR_MAX__ / 4 * 5U)
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|| !ovf)
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__builtin_abort ();
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if (fn3 (0, 0, &ovf) != (unsigned char) ~0 - 65
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|| ovf
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|| fn3 (63, 2, &ovf) != (unsigned char) ~0
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|| ovf
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|| fn3 (62, 3, &ovf) != (unsigned char) ~0
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|| ovf
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|| fn3 (63, 3, &ovf) != 0
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|| !ovf)
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__builtin_abort ();
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if (fn4 (0, 0, &ovf) != (unsigned char) ~0
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|| ovf
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|| fn4 (1, 0, &ovf) != 0
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|| !ovf
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|| fn4 (0, 1, &ovf) != 0
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|| !ovf
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|| fn4 (63, 3, &ovf) != 17
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|| !ovf)
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__builtin_abort ();
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if (fn5 (0, 0, &ovf) != 0
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|| ovf
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|| fn5 (1, 0, &ovf) != -65536L
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|| !ovf
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|| fn5 (2, 32768, &ovf) != -65536L
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|| !ovf
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|| fn5 (4, 32768 + 16384 + 8192, &ovf) != -32768L
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|| !ovf)
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__builtin_abort ();
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return 0;
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}
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/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 2 "optimized" } } */
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/* { dg-final { scan-tree-dump-times "SUB_OVERFLOW" 0 "optimized" } } */
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/* { dg-final { scan-tree-dump-times "MUL_OVERFLOW" 3 "optimized" } } */
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