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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [testsuite/] [gcc.dg/] [tree-ssa/] [pr22236.c] - Blame information for rev 826

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1 298 jeremybenn
/* { dg-do run } */
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/* { dg-options "-O1 -fno-tree-vrp -fwrapv" } */
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/* PR tree-optimization/22236
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    Avoid conversion of (signed char) {(uchar)1, +, (uchar)1}_x when
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    it is not possible to prove that the scev does not wrap.
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    In this PR, a sequence 1, 2, ..., 255 has to be converted to
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    signed char, but this would wrap: 1, 2, ..., 127, -128, ...  The
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    result should not be a linear scev {(schar)1, +, (schar)1}_x.
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    The conversion should be kept: (schar) {(uchar)1, +, (uchar)1}_x.
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 */
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void abort(void);
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static inline void
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foo (signed char a)
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{
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  int b = a - 0x7F;
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  if (b > 1)
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    abort();
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}
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int main()
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{
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  unsigned char b;
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  for(b = 0; b < 0xFF; b++)
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    foo (b);
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  return 0;
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}
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