50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* Test for a bogus warning on comparison between signed and unsigned.
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Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001. */
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/* { dg-do compile } */
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/* { dg-options "-fshow-column -Wsign-compare -fstrict-overflow" } */
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extern void bar(void);
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int foo(int x, int y, unsigned u)
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{
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/* A COMPOUND_EXPR is non-negative if the last element is known to
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be non-negative. */
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if (u < (bar(), -1)) /*{ dg-warning "9:signed and unsigned" "COMPOUND_EXPR" }*/
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return x;
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if (u < (bar(), 10))
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return x;
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if ((bar(), 10) < u)
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return x;
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if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10))
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return x;
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if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u)
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return x;
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/* Test an ABS_EXPR, which is by definition non-negative when
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-fstrict-overflow is used. */
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if (u < __builtin_abs(x))
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return x;
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if (__builtin_abs(x) < u)
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return x;
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if (u < (x ? __builtin_abs(x) : 10))
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return x;
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if ((x ? 10: __builtin_abs(x)) < u)
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return x;
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/* A MODIFY_EXPR is non-negative if the new value is known to be
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non-negative. */
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if (u < (x = -1)) /* { dg-warning "9:signed and unsigned" "MODIFY_EXPR" } */
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return x;
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if (u < (x = 10))
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return x;
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if ((x = 10) < u)
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return x;
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if (u < (x = (y ? (x==y) : 10)))
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return x;
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if ((x = (y ? 10 : (x==y))) < u)
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return x;
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return 0;
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}
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