[src/trunk]: src/sys/arch/m68k/fpe Break a loop off to avoid a long loop even...

[isaki <isaki%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ae664ea46f92
branches:  trunk
changeset: 786213:ae664ea46f92
user:      isaki <isaki%NetBSD.org@localhost>
date:      Sat Apr 20 04:38:51 2013 +0000

description:
Break a loop off to avoid a long loop even if the precision is not enough.

diffstat:

 sys/arch/m68k/fpe/fpu_exp.c    |  9 ++++++---
 sys/arch/m68k/fpe/fpu_hyperb.c |  9 ++++++---
 2 files changed, 12 insertions(+), 6 deletions(-)

diffs (66 lines):

diff -r fd8c95ff1f54 -r ae664ea46f92 sys/arch/m68k/fpe/fpu_exp.c
--- a/sys/arch/m68k/fpe/fpu_exp.c       Sat Apr 20 03:37:55 2013 +0000
+++ b/sys/arch/m68k/fpe/fpu_exp.c       Sat Apr 20 04:38:51 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fpu_exp.c,v 1.6 2013/04/20 03:06:19 isaki Exp $        */
+/*     $NetBSD: fpu_exp.c,v 1.7 2013/04/20 04:38:51 isaki Exp $        */
 
 /*
  * Copyright (c) 1995  Ken Nakata
@@ -32,10 +32,13 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fpu_exp.c,v 1.6 2013/04/20 03:06:19 isaki Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fpu_exp.c,v 1.7 2013/04/20 04:38:51 isaki Exp $");
 
 #include "fpu_emulate.h"
 
+/* The number of items to terminate the Taylor expansion */
+#define MAX_ITEMS      (2000)
+
 /*
  * fpu_exp.c: defines fpu_etox(), fpu_etoxm1(), fpu_tentox(), and fpu_twotox();
  */
@@ -64,7 +67,7 @@
        CPYFPN(&res, r);
 
        k = 2;
-       for (;; k++) {
+       for (; k < MAX_ITEMS; k++) {
                /* s1 = s0 * x / k */
                CPYFPN(&fe->fe_f1, &s0);
                CPYFPN(&fe->fe_f2, &x);
diff -r fd8c95ff1f54 -r ae664ea46f92 sys/arch/m68k/fpe/fpu_hyperb.c
--- a/sys/arch/m68k/fpe/fpu_hyperb.c    Sat Apr 20 03:37:55 2013 +0000
+++ b/sys/arch/m68k/fpe/fpu_hyperb.c    Sat Apr 20 04:38:51 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fpu_hyperb.c,v 1.10 2013/04/19 14:05:12 isaki Exp $    */
+/*     $NetBSD: fpu_hyperb.c,v 1.11 2013/04/20 04:38:51 isaki Exp $    */
 
 /*
  * Copyright (c) 1995  Ken Nakata
@@ -57,10 +57,13 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fpu_hyperb.c,v 1.10 2013/04/19 14:05:12 isaki Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fpu_hyperb.c,v 1.11 2013/04/20 04:38:51 isaki Exp $");
 
 #include "fpu_emulate.h"
 
+/* The number of items to terminate the Taylor expansion */
+#define MAX_ITEMS      (2000)
+
 /*
  * fpu_hyperb.c: defines the following functions
  *
@@ -159,7 +162,7 @@
 
        sign = 1;       /* sign := (-1)^n */
 
-       for (;;) {
+       for (; f < (2 * MAX_ITEMS); ) {
                /* (f1 :=) s0 * x^2 */
                CPYFPN(&fe->fe_f1, s0);
                CPYFPN(&fe->fe_f2, &x2);