test: fix division by zero

[ upstream commit 07b3c7d ]

Variable i is used as a denominator which may be zero, and
this may result in segmentation fault.

This patch fixed it.

Fixes: 948bc3d ("test: add reciprocal based division")

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

app/test/test_reciprocal_division_perf.c

@@ -71,10 +71,12 @@ test_reciprocal_division_perf(void)
 			tot_cyc_n);
 	printf("Total number of cycles reciprocal division : %"PRIu64"\n",
 			tot_cyc_r);
-	printf("Cycles per division(normal) : %3.2f\n",
-			((double)tot_cyc_n)/i);
-	printf("Cycles per division(reciprocal) : %3.2f\n\n",
-			((double)tot_cyc_r)/i);
+	if (i != 0) {
+		printf("Cycles per division(normal) : %3.2f\n",
+				((double)tot_cyc_n)/i);
+		printf("Cycles per division(reciprocal) : %3.2f\n\n",
+				((double)tot_cyc_r)/i);
+	}
 
 	tot_cyc_n = 0;
 	tot_cyc_r = 0;
@@ -111,11 +113,12 @@ test_reciprocal_division_perf(void)
 			tot_cyc_n);
 	printf("Total number of cycles reciprocal division : %"PRIu64"\n",
 			tot_cyc_r);
-	printf("Cycles per division(normal) : %3.2f\n",
-			((double)tot_cyc_n)/i);
-	printf("Cycles per division(reciprocal) : %3.2f\n\n",
-			((double)tot_cyc_r)/i);
-
+	if (i != 0) {
+		printf("Cycles per division(normal) : %3.2f\n",
+				((double)tot_cyc_n)/i);
+		printf("Cycles per division(reciprocal) : %3.2f\n\n",
+				((double)tot_cyc_r)/i);
+	}
 	tot_cyc_n = 0;
 	tot_cyc_r = 0;
 
@@ -152,10 +155,12 @@ test_reciprocal_division_perf(void)
 			tot_cyc_n);
 	printf("Total number of cycles reciprocal division : %"PRIu64"\n",
 			tot_cyc_r);
-	printf("Cycles per division(normal) : %3.2f\n",
-			((double)tot_cyc_n)/i);
-	printf("Cycles per division(reciprocal) : %3.2f\n\n",
-			((double)tot_cyc_r)/i);
+	if (i != 0) {
+		printf("Cycles per division(normal) : %3.2f\n",
+				((double)tot_cyc_n)/i);
+		printf("Cycles per division(reciprocal) : %3.2f\n\n",
+				((double)tot_cyc_r)/i);
+	}
 
 	tot_cyc_n = 0;
 	tot_cyc_r = 0;
@@ -190,10 +195,12 @@ test_reciprocal_division_perf(void)
 			tot_cyc_n);
 	printf("Total number of cycles reciprocal division : %"PRIu64"\n",
 			tot_cyc_r);
-	printf("Cycles per division(normal) : %3.2f\n",
-			((double)tot_cyc_n)/i);
-	printf("Cycles per division(reciprocal) : %3.2f\n",
-			((double)tot_cyc_r)/i);
+	if (i != 0) {
+		printf("Cycles per division(normal) : %3.2f\n",
+				((double)tot_cyc_n)/i);
+		printf("Cycles per division(reciprocal) : %3.2f\n",
+				((double)tot_cyc_r)/i);
+	}
 
 	return result;
 }