Viewing file:  signbit-6.c (1.08 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O1" } */
#include <stdint.h>
#include <limits.h>
#include <stdio.h>
#ifndef N
#define N 65
#endif
#ifndef TYPE
#define TYPE int32_t
#endif
#ifndef DEBUG
#define DEBUG 1
#endif
#define BASE ((TYPE) -1 < 0 ? -126 : 4)
__attribute__ ((noinline, noipa))
void fun1(TYPE *x, int n)
{
for (int i = 0; i < n; i++)
x[i] = (-x[i]) >> 31;
}
__attribute__ ((noinline, noipa, optimize("O0")))
void fun2(TYPE *x, int n)
{
for (int i = 0; i < n; i++)
x[i] = (-x[i]) >> 31;
}
int main ()
{
TYPE a[N];
TYPE b[N];
a[0] = INT_MIN;
b[0] = INT_MIN;
for (int i = 1; i < N; ++i)
{
a[i] = BASE + i * 13;
b[i] = BASE + i * 13;
if (DEBUG)
printf ("%d: 0x%x\n", i, a[i]);
}
fun1 (a, N);
fun2 (b, N);
if (DEBUG)
printf ("%d = 0x%x == 0x%x\n", 0, a[0], b[0]);
if (a[0] != 0x0 || b[0] != -1)
__builtin_abort ();
for (int i = 1; i < N; ++i)
{
if (DEBUG)
printf ("%d = 0x%x == 0x%x\n", i, a[i], b[i]);
if (a[i] != b[i])
__builtin_abort ();
}
return 0;
}
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