From a55e41c31de52d216d0e43e1537ab3a6e7e44f32 Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Sun, 24 Oct 2010 05:55:01 +0000
Subject: Clean up ctlz.c

git-svn-id: svn://mattst88.com/svn/alpha_mmintrin/trunk@7 f7d56953-e76f-4e43-a77e-20d50f6c004e
---
 testsuite/ctlz.c | 46 +++++++++++++++++++---------------------------
 1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/testsuite/ctlz.c b/testsuite/ctlz.c
index 6bd91ea..eb7c96b 100644
--- a/testsuite/ctlz.c
+++ b/testsuite/ctlz.c
@@ -6,44 +6,39 @@
 #include "../alpha_mmintrin.h"
 
 #define ITERATIONS 10000
+#define ARRAY_ELEMENTS 512
+#define ARRAY_SIZE (ARRAY_ELEMENTS * sizeof(uint64_t))
 
 int main(int argc, char ** argv) {
-	uint64_t a[512], b[512], c[512];
+	uint64_t a[ARRAY_ELEMENTS], b[ARRAY_ELEMENTS], c[ARRAY_ELEMENTS];
 	uint64_t l1, l2;
-	uint64_t start, end, overhead;
-	uint64_t cix_total = 0, noncix_total = 0;
+	struct timespec cix_start, cix_end;
+	double cix_t0, cix_t1, cix_total;
+	struct timespec noncix_start, noncix_end;
+	double noncix_t0, noncix_t1, noncix_total;
 	int i, j, count = 0;
 
-	start = __rpcc();
-	end = __rpcc();
-	overhead = end - start;
-
 	srand(time(NULL));
 
-	for (i = 0; i < 512; i++) {
+	for (i = 0; i < ARRAY_ELEMENTS; i++) {
 		a[i] = rand();
 	}
 	
+	clock_gettime(CLOCK_MONOTONIC, &cix_start);
 	for (j = 0; j < ITERATIONS; j++) {
-		start = __rpcc();
-
-		for (i = 0; i < 512; i++) {
+		for (i = 0; i < ARRAY_ELEMENTS; i++) {
 			l1 = a[i];
 
 			l2 = 1 << (64 - __ctlz(l1));
 
 			b[i] = l2;
 		}
-
-		end = __rpcc();
-		cix_total += end - start - overhead;
-		memset(b, 0, 4096);
 	}
+	clock_gettime(CLOCK_MONOTONIC, &cix_end);
 
+	clock_gettime(CLOCK_MONOTONIC, &noncix_start);
 	for (j = 0; j < ITERATIONS; j++) {
-		start = __rpcc();
-		
-		for (i = 0; i < 512; i++) {
+		for (i = 0; i < ARRAY_ELEMENTS; i++) {
 			l1 = a[i];
 			while (l1 != 0) {
 				l1 >>= 1;
@@ -51,21 +46,18 @@ int main(int argc, char ** argv) {
 			}
 			l2 = 1 << count;
 			c[i] = l2;
-	//		printf("nextpow2 of %lu is %lu\n", i, l2);
 			count = 0;
 		}
-		
-		end = __rpcc();
-		noncix_total += end - start - overhead;
-		memset(c, 0, 4096);
 	}
+	clock_gettime(CLOCK_MONOTONIC, &noncix_end);
 
-	noncix_total /= ITERATIONS;
-	cix_total /= ITERATIONS;
+	cix_total = (double)((cix_end.tv_sec - cix_start.tv_sec) + ((cix_end.tv_nsec - cix_start.tv_nsec) / 1.0e9)) / ITERATIONS;
+	noncix_total = (double)((noncix_end.tv_sec - noncix_start.tv_sec) + ((noncix_end.tv_nsec - noncix_start.tv_nsec) / 1.0e9)) / ITERATIONS;
 
-	if (memcmp(b, c, 4096) == 0) {
+	if (memcmp(b, c, ARRAY_SIZE) == 0) {
 		printf("%s:\n", argv[0]);
-		printf("     CIX time: %9lu nanoseconds\n non-CIX time: %9lu nanoseconds\n", cix_total, noncix_total);
+		printf("     CIX time: %.9lf seconds\n non-CIX time: %.9lf seconds\n", cix_total, noncix_total);
+		printf("     Speed-up: %lf\n", noncix_total / cix_total);
 	} else {
 		puts("Final arrays are not equal. Something happened.");
 	}
-- 
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