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Add support for the FPA floating-point format on ARM. The

Browse Source 
FPA floating-point format is identical to the VFP format,
but is always stored in big-endian.
Introduce _IEEE_WORD_ORDER to describe the byte-order of
the FP representation.

Obtained from:	Juniper Networks, Inc
This commit is contained in:
Marcel Moolenaar 2008-12-23 22:20:59 +00:00
parent 4769218f4b
commit 74aed9855d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=186461
5 changed files with 46 additions and 5 deletions
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15
lib/libc/arm/_fpmath.h
View File

@ -26,15 +26,26 @@
* $FreeBSD$
*/
#if defined(__VFP_FP__)
#define _IEEE_WORD_ORDER _BYTE_ORDER
#else
#define _IEEE_WORD_ORDER _BIG_ENDIAN
#endif
union IEEEl2bits {
long double e;
struct {
#ifndef __ARMEB__
#if _BYTE_ORDER == _LITTLE_ENDIAN
#if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
unsigned int manl :32;
#endif
unsigned int manh :20;
unsigned int exp :11;
unsigned int sign :1;
#else
#if _IEEE_WORD_ORDER == _BIG_ENDIAN
unsigned int manl :32;
#endif
#else /* _BYTE_ORDER == _LITTLE_ENDIAN */
unsigned int sign :1;
unsigned int exp :11;
unsigned int manh :20;

2
lib/libc/arm/arith.h
View File

@ -11,7 +11,7 @@
* architecture. See contrib/gdtoa/gdtoaimp.h for details.
*/
#ifndef __ARMEB__
#if !defined(__ARMEB__) && defined(__VFP_FP__)
#define IEEE_8087
#define Arith_Kind_ASL 1
#define Sudden_Underflow

9
lib/libc/include/fpmath.h
View File

@ -30,6 +30,10 @@
#include <sys/endian.h>
#include "_fpmath.h"
#ifndef _IEEE_WORD_ORDER
#define _IEEE_WORD_ORDER _BYTE_ORDER
#endif
union IEEEf2bits {
float f;
struct {
@ -52,10 +56,15 @@ union IEEEd2bits {
double d;
struct {
#if _BYTE_ORDER == _LITTLE_ENDIAN
#if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
unsigned int manl :32;
#endif
unsigned int manh :20;
unsigned int exp :11;
unsigned int sign :1;
#if _IEEE_WORD_ORDER == _BIG_ENDIAN
unsigned int manl :32;
#endif
#else /* _BIG_ENDIAN */
unsigned int sign :1;
unsigned int exp :11;

14
lib/msun/src/math_private.h
View File

@ -38,7 +38,17 @@
* ints.
*/
#if BYTE_ORDER == BIG_ENDIAN
#ifdef __arm__
#if defined(__VFP_FP__)
#define IEEE_WORD_ORDER BYTE_ORDER
#else
#define IEEE_WORD_ORDER BIG_ENDIAN
#endif
#else /* __arm__ */
#define IEEE_WORD_ORDER BYTE_ORDER
#endif
#if IEEE_WORD_ORDER == BIG_ENDIAN
typedef union
{
@ -52,7 +62,7 @@ typedef union
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#if IEEE_WORD_ORDER == LITTLE_ENDIAN
typedef union
{

11
sys/arm/include/ieee.h
View File

@ -91,6 +91,12 @@
#define DBL_EXPBITS 11
#define DBL_FRACBITS 52
#if defined(__VFP_FP__)
#define _IEEE_WORD_ORDER _BYTE_ORDER
#else
#define _IEEE_WORD_ORDER _BIG_ENDIAN
#endif
struct ieee_single {
#if _BYTE_ORDER == _BIG_ENDIAN
u_int sng_sign:1;
@ -110,10 +116,15 @@ struct ieee_double {
u_int dbl_frach:20;
u_int dbl_fracl;
#else
#if _IEEE_WORD_ORDER == _LITTLE_ENDIAN
u_int dbl_fracl;
#endif
u_int dbl_frach:20;
u_int dbl_exp:11;
u_int dbl_sign:1;
#if _IEEE_WORD_ORDER == _BIG_ENDIAN
u_int dbl_fracl;
#endif
#endif
};