Attachment 8623 Details for Bug 17984 – file.diff

[patch] file.diff

file.diff (text/plain), 2.00 KB, created by wkb on 2000-04-13 19:40:00 UTC

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Creator: wkb

Created: 2000-04-13 19:40:00 UTC

Size: 2.00 KB

patch

obsolete

>--- npx.h.releng_3	Wed Apr 12 16:28:38 2000
>+++ npx.h	Wed Apr 12 16:33:36 2000
>@@ -85,54 +85,24 @@
> 	u_char	sv_pad[64];	/* padding; used by emulators */
> };
> 
>-/* Intel prefers long real (53 bit) precision */
>-#define	__iBCS_NPXCW__		0x262
>-/* wfj prefers temporary real (64 bit) precision */
>-#define	__386BSD_NPXCW__	0x362
> /*
>- * bde prefers 53 bit precision and all exceptions masked.
>- *
>- * The standard control word from finit is 0x37F, giving:
>+ * The hardware default control word for i387's and later coprocessors 
>is
>+ * 0x37F, giving:
>  *
>  *	round to nearest
>  *	64-bit precision
>  *	all exceptions masked.
>  *
>- * Now I want:
>+ * We modify the affine mode bit and precision bits in this to give:
>  *
>  *	affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
>  *	53-bit precision (2 in bitfield 3<<8)
>- *	overflow exception unmasked (0 in bitfield 1<<3)
>- *	zero divide exception unmasked (0 in bitfield 1<<2)
>- *	invalid-operand exception unmasked (0 in bitfield 1<<0).
>  *
>  * 64-bit precision often gives bad results with high level languages
>  * because it makes the results of calculations depend on whether
>  * intermediate values are stored in memory or in FPU registers.
>- *
>- * The "Intel" and wfj control words have:
>- *
>- *	underflow exception unmasked (0 in bitfield 1<<4)
>- *
>- * but that causes an unexpected exception in the test program 
>'paranoia'
>- * and makes denormals useless (DBL_MIN / 2 underflows).  It doesn't 
>make
>- * a lot of sense to trap underflow without trapping denormals.
>- *
>- * Later I will want the IEEE default of all exceptions masked.  See 
>the
>- * 0.0 math manpage for why this is better.  The 0.1 math manpage is 
>empty.
>  */
>-#define	__BDE_NPXCW__		0x1272
>-#define	__BETTER_BDE_NPXCW__	0x127f
>-
>-#ifdef __BROKEN_NPXCW__
>-#ifdef __FreeBSD__
>-#define	__INITIAL_NPXCW__	__386BSD_NPXCW__
>-#else
>-#define	__INITIAL_NPXCW__	__iBCS_NPXCW__
>-#endif
>-#else
>-#define	__INITIAL_NPXCW__	__BDE_NPXCW__
>-#endif
>+#define	__INITIAL_NPXCW__	0x127F
> 
> #ifdef KERNEL
> extern struct proc *npxproc;

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