Viewing file:  reduc-6.c (1.15 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops2-details -fdump-tree-optimized" } */
#include <stdarg.h>
#include <stdlib.h>
#define N 1600
#define DIFF 2558402
__attribute__ ((noinline))
int main1 (float x, float max_result)
{
int i;
float b[N];
float c[N];
float diff = 2;
float max = x;
float min = 10;
for (i=0; i<N; i++)
{
b[i] = i * 3;
c[i] = i;
}
for (i = 0; i < N; i++) {
diff += (b[i] - c[i]);
}
for (i = 0; i < N; i++) {
max = max < c[i] ? c[i] : max;
}
for (i = 0; i < N; i++) {
min = min > c[i] ? c[i] : min;
}
/* check results: */
if (diff != DIFF)
abort ();
if (max != max_result)
abort ();
if (min != 0)
abort ();
return 0;
}
int main (void)
{
main1 (2000, 2000);
main1 (0, 1599);
return 0;
}
/* need -ffast-math to parallelize these loops. */
/* { dg-final { scan-tree-dump-times "Detected reduction" 0 "parloops2" } } */
/* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 1 "parloops2" } } */
/* { dg-final { scan-tree-dump-times "FAILED: it is not a part of reduction" 3 "parloops2" } } */
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