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re PR c/43772 (Errant -Wlogical-op warning when testing limits) 

2012-05-05  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c/43772
testsuite/
	* c-c++-common/pr43772.c: New.

From-SVN: r187195
This commit is contained in:
Manuel López-Ibáñez 2012-05-05 11:32:26 +00:00
parent f2c4a78515
commit 8b5e75a5c6
1 changed files with 45 additions and 0 deletions
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45
gcc/testsuite/c-c++-common/pr43772.c Normal file
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/* { dg-do compile } */
/* { dg-options "-Wlogical-op -Wtype-limits" } */
#include <limits.h>
long long
emacs_lseek (long long offset)
{
return -1-9223372036854775807LL <= offset && offset <= 9223372036854775807LL;
}
long long
foo (long long offset)
{
return -1-9223372036854775807LL > offset && offset > 9223372036854775807LL;
}
long long
foo3 (long long offset)
{
return -1-9223372036854775807LL > offset && offset < 9223372036854775807LL;
}
long long
foo2 (long long offset)
{
if (-1-9223372036854775807LL <= offset) return 0;
if (offset <= 9223372036854775807LL) return 0;
if (-1-9223372036854775807LL > offset) return 0;
if (offset > 9223372036854775807LL) return 0;
return 1;
}
# define BOT INT_MIN
# define TOP INT_MAX
long long get_intmax(void);
int get_int(void);
extern void do_something(void);
int main(void)
{
int i = get_int();
long long x = get_intmax();
i = (i > BOT && i < TOP); //OK
i = (i >= BOT+1 && i <= TOP-1); //OK
i = (i >= BOT && i <= TOP); //Oops!
}