X-Git-Url: http://git.annexia.org/?p=jonesforth.git;a=blobdiff_plain;f=perf_dupdrop.c;fp=perf_dupdrop.c;h=a1f3786175ac61886e397506f8cca09a17af4355;hp=0000000000000000000000000000000000000000;hb=465979550d58288f6bee28c49064d9c841a6f45f;hpb=83c6612bf07228f70d25136c850f660721379632;ds=sidebyside

diff --git a/perf_dupdrop.c b/perf_dupdrop.c
new file mode 100644
index 0000000..a1f3786
--- /dev/null
+++ b/perf_dupdrop.c
@@ -0,0 +1,33 @@
+/*	Ideal DUP DROP * 1000 assuming perfect inlining.
+	$Id: perf_dupdrop.c,v 1.1 2007-10-10 13:01:05 rich Exp $
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define DUP					\
+  asm volatile ("mov (%%esp),%%eax\n"		\
+		"\tpush %%eax"			\
+		: : : "eax")
+#define DROP					\
+  asm volatile ("pop %%eax"			\
+		: : : "eax")
+
+#define DUPDROP DUP; DROP;
+#define DUPDROP10 DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP DUPDROP
+#define DUPDROP100 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10 DUPDROP10
+#define DUPDROP1000 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100 DUPDROP100
+
+int
+main (int argc, char *argv[])
+{
+  unsigned long long start_time, end_time;
+
+  asm volatile ("rdtsc" : "=A" (start_time));
+  DUPDROP1000
+  asm volatile ("rdtsc" : "=A" (end_time));
+
+  printf ("%llu\n", end_time - start_time);
+
+  exit (0);
+}