In fbench, compute sin/cos/sqrt from "first principles", so that the
program more uniformly measures the speed of FP +/-/* load/store
across different architectures.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5455 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/perf/fbench.c b/perf/fbench.c
index 83e573f..79bbb3e 100644
--- a/perf/fbench.c
+++ b/perf/fbench.c
@@ -8,6 +8,16 @@
// site is in the public domain and may be used in any manner without
// permission, restriction, attribution, or compensation."
+/* This program can be used in two ways. If INTRIG is undefined, sin,
+ cos, tan, etc, will be used as supplied by <math.h>. If it is
+ defined, then the program calculates all this stuff from first
+ principles (so to speak) and does not use the libc facilities. For
+ benchmarking purposes it seems better to avoid the libc stuff, so
+ that the inner loops (sin, sqrt) present a workload independent of
+ libc implementations on different platforms. Hence: */
+
+#define INTRIG 1
+
/*
@@ -238,6 +248,7 @@
*/
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -289,7 +300,7 @@
tracing code. */
#ifndef ITERATIONS
-#define ITERATIONS /*1000*/ /*500000*/ 125000
+#define ITERATIONS /*1000*/ /*500000*/ 80000
#endif
int niter = ITERATIONS; /* Iteration counter */