Tue Mar 12 03:15:02 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

	* sysdeps/unix/sysv/linux/i386/fpu_control.h (_FPU_DEFAULT): Change
	default to double precision, all interrupts masked; fdlibm requires.

diff --git a/ChangeLog b/ChangeLog
index 80b4d8c..02f53fb 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Mar 12 03:15:02 1996  Roland McGrath  <roland@charlie-brown.gnu.ai.mit.edu>
+
+       * sysdeps/unix/sysv/linux/i386/fpu_control.h (_FPU_DEFAULT): Change
+       default to double precision, all interrupts masked; fdlibm requires.
+
 Sat Mar  9 18:44:27 1996  Roland McGrath  <roland@charlie-brown.gnu.ai.mit.edu>
 
        * sysdeps/unix/sysv/linux/i386/setfpucw.c: Obsolete file removed.

diff --git a/sysdeps/unix/sysv/linux/i386/fpu_control.h b/sysdeps/unix/sysv/linux/i386/fpu_control.h
index 56f42cd..ed56d83 100644 (file)
--- a/sysdeps/unix/sysv/linux/i386/fpu_control.h
+++ b/sysdeps/unix/sysv/linux/i386/fpu_control.h
@@ -63,8 +63,8 @@ Boston, MA 02111-1307, USA.  */
 #define _FPU_MASK_PM  0x20
 
 /* precision control */
-#define _FPU_EXTENDED 0x300   /* RECOMMENDED */
-#define _FPU_DOUBLE   0x200
+#define _FPU_EXTENDED 0x300
+#define _FPU_DOUBLE   0x200    /* fdlibm requires double precision */
 #define _FPU_SINGLE   0x0     /* DO NOT USE */
 
 /* rounding control */
@@ -76,16 +76,13 @@ Boston, MA 02111-1307, USA.  */
 #define _FPU_RESERVED 0xF0C0  /* Reserved bits in cw */
 
 
-/* Now two recommended cw */
+/* The fdlibm code requires strict IEEE double precision arithmetic,
+   and no interrupts for exceptions, rounding to nearest.  */
 
-/* Linux default:
-     - extended precision
-     - rounding to nearest
-     - exceptions on overflow, zero divide and NaN */
-#define _FPU_DEFAULT  0x1372
+#define _FPU_DEFAULT  0x127f
 
 /* IEEE:  same as above, but exceptions */
-#define _FPU_IEEE     0x137f
+#define _FPU_IEEE     0x127f
 
 /* Type of the control word.  */
 typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));