1 /* { dg-do compile } */ 2 /* { dg-do run } */ 3 /* { dg-options "-O2 -funroll-loops --param max-unroll-times=8 -fpredictive-commoning -fdump-tree-pcom-details -fno-tree-pre" } */ 4 5 void abort (void); 6 7 unsigned fib[1000]; 8 9 __attribute__ ((noinline)) count_fib(void)10void count_fib(void) 11 { 12 int i; 13 14 fib[0] = 0; 15 fib[1] = 1; 16 for (i = 2; i < 1000; i++) 17 fib[i] = (fib[i-1] + fib[i - 2]) & 0xffff; 18 } 19 20 unsigned avg[1000]; 21 22 __attribute__ ((noinline)) count_averages(int n)23void count_averages(int n) 24 { 25 int i; 26 27 for (i = 1; i < n; i++) 28 avg[i] = (((unsigned long) fib[i - 1] + fib[i] + fib[i + 1]) / 3) & 0xffff; 29 } 30 main(void)31int main(void) 32 { 33 count_fib (); 34 count_averages (999); 35 36 if (fib[19] != 4181 || avg[19] != 4510) 37 abort (); 38 39 if (fib[999] != 162 || avg[998] != 21953) 40 abort (); 41 42 return 0; 43 } 44 45 /* Verify that both loops were transformed and unrolled. */ 46 /* { dg-final { scan-tree-dump-times "Unrolling 2 times." 2 "pcom"} } */ 47 48 /* Also check that we undid the transformation previously made by PRE. 49 ??? PRE now does the predictive commoning in count_averages. */ 50 /* dg-final { scan-tree-dump-times "looparound ref" 1 "pcom" } */ 51