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comparison gcc/testsuite/gcc.dg/compare4.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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68:561a7518be6b 111:04ced10e8804
1 /* Test for a bogus warning on comparison between signed and unsigned.
2 Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001. */
3
4 /* { dg-do compile } */
5 /* { dg-options "-fshow-column -Wsign-compare -fstrict-overflow" } */
6
7 extern void bar(void);
8
9 int foo(int x, int y, unsigned u)
10 {
11 /* A COMPOUND_EXPR is non-negative if the last element is known to
12 be non-negative. */
13 if (u < (bar(), -1)) /*{ dg-warning "9:different signedness" "COMPOUND_EXPR" }*/
14 return x;
15 if (u < (bar(), 10))
16 return x;
17 if ((bar(), 10) < u)
18 return x;
19 if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10))
20 return x;
21 if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u)
22 return x;
23
24 /* Test an ABS_EXPR, which is by definition non-negative when
25 -fstrict-overflow is used. */
26 if (u < __builtin_abs(x))
27 return x;
28 if (__builtin_abs(x) < u)
29 return x;
30 if (u < (x ? __builtin_abs(x) : 10))
31 return x;
32 if ((x ? 10: __builtin_abs(x)) < u)
33 return x;
34
35 /* A MODIFY_EXPR is non-negative if the new value is known to be
36 non-negative. */
37 if (u < (x = -1)) /* { dg-warning "9:different signedness" "MODIFY_EXPR" } */
38 return x;
39 if (u < (x = 10))
40 return x;
41 if ((x = 10) < u)
42 return x;
43 if (u < (x = (y ? (x==y) : 10)))
44 return x;
45 if ((x = (y ? 10 : (x==y))) < u)
46 return x;
47
48 return 0;
49 }