mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
bedf142b8b
Patch from Lennert Buytenhek nwfpe extended precision emulation used to be broken on big-endian and was therefore disabled. This patch fixes nwfpe so that it copies extended precision floats to/from userspace in the proper word order (similar to patch #2046, see the description of that patch for an explanation) and reenables the Kconfig option. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
278 lines
9.6 KiB
C
278 lines
9.6 KiB
C
|
|
/*
|
|
===============================================================================
|
|
|
|
This C header file is part of the SoftFloat IEC/IEEE Floating-point
|
|
Arithmetic Package, Release 2.
|
|
|
|
Written by John R. Hauser. This work was made possible in part by the
|
|
International Computer Science Institute, located at Suite 600, 1947 Center
|
|
Street, Berkeley, California 94704. Funding was partially provided by the
|
|
National Science Foundation under grant MIP-9311980. The original version
|
|
of this code was written as part of a project to build a fixed-point vector
|
|
processor in collaboration with the University of California at Berkeley,
|
|
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
|
is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
|
arithmetic/softfloat.html'.
|
|
|
|
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
|
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
|
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
|
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
|
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
|
|
|
Derivative works are acceptable, even for commercial purposes, so long as
|
|
(1) they include prominent notice that the work is derivative, and (2) they
|
|
include prominent notice akin to these three paragraphs for those parts of
|
|
this code that are retained.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
#ifndef __SOFTFLOAT_H__
|
|
#define __SOFTFLOAT_H__
|
|
|
|
#include <linux/config.h>
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
The macro `FLOATX80' must be defined to enable the extended double-precision
|
|
floating-point format `floatx80'. If this macro is not defined, the
|
|
`floatx80' type will not be defined, and none of the functions that either
|
|
input or output the `floatx80' type will be defined.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
#ifdef CONFIG_FPE_NWFPE_XP
|
|
#define FLOATX80
|
|
#endif
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point types.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
typedef u32 float32;
|
|
typedef u64 float64;
|
|
typedef struct {
|
|
#ifdef __ARMEB__
|
|
u16 __padding;
|
|
u16 high;
|
|
#else
|
|
u16 high;
|
|
u16 __padding;
|
|
#endif
|
|
u64 low;
|
|
} floatx80;
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point underflow tininess-detection mode.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
extern signed char float_detect_tininess;
|
|
enum {
|
|
float_tininess_after_rounding = 0,
|
|
float_tininess_before_rounding = 1
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point rounding mode.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
//extern int8 float_rounding_mode;
|
|
enum {
|
|
float_round_nearest_even = 0,
|
|
float_round_to_zero = 1,
|
|
float_round_down = 2,
|
|
float_round_up = 3
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point exception flags.
|
|
-------------------------------------------------------------------------------
|
|
enum {
|
|
float_flag_inexact = 1,
|
|
float_flag_underflow = 2,
|
|
float_flag_overflow = 4,
|
|
float_flag_divbyzero = 8,
|
|
float_flag_invalid = 16
|
|
};
|
|
|
|
ScottB: November 4, 1998
|
|
Changed the enumeration to match the bit order in the FPA11.
|
|
*/
|
|
|
|
enum {
|
|
float_flag_invalid = 1,
|
|
float_flag_divbyzero = 2,
|
|
float_flag_overflow = 4,
|
|
float_flag_underflow = 8,
|
|
float_flag_inexact = 16
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Routine to raise any or all of the software IEC/IEEE floating-point
|
|
exception flags.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
void float_raise( signed char );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE integer-to-floating-point conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
float32 int32_to_float32( struct roundingData *, signed int );
|
|
float64 int32_to_float64( signed int );
|
|
#ifdef FLOATX80
|
|
floatx80 int32_to_floatx80( signed int );
|
|
#endif
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE single-precision conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
signed int float32_to_int32( struct roundingData *, float32 );
|
|
signed int float32_to_int32_round_to_zero( float32 );
|
|
float64 float32_to_float64( float32 );
|
|
#ifdef FLOATX80
|
|
floatx80 float32_to_floatx80( float32 );
|
|
#endif
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE single-precision operations.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
float32 float32_round_to_int( struct roundingData*, float32 );
|
|
float32 float32_add( struct roundingData *, float32, float32 );
|
|
float32 float32_sub( struct roundingData *, float32, float32 );
|
|
float32 float32_mul( struct roundingData *, float32, float32 );
|
|
float32 float32_div( struct roundingData *, float32, float32 );
|
|
float32 float32_rem( struct roundingData *, float32, float32 );
|
|
float32 float32_sqrt( struct roundingData*, float32 );
|
|
char float32_eq( float32, float32 );
|
|
char float32_le( float32, float32 );
|
|
char float32_lt( float32, float32 );
|
|
char float32_eq_signaling( float32, float32 );
|
|
char float32_le_quiet( float32, float32 );
|
|
char float32_lt_quiet( float32, float32 );
|
|
char float32_is_signaling_nan( float32 );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE double-precision conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
signed int float64_to_int32( struct roundingData *, float64 );
|
|
signed int float64_to_int32_round_to_zero( float64 );
|
|
float32 float64_to_float32( struct roundingData *, float64 );
|
|
#ifdef FLOATX80
|
|
floatx80 float64_to_floatx80( float64 );
|
|
#endif
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE double-precision operations.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
float64 float64_round_to_int( struct roundingData *, float64 );
|
|
float64 float64_add( struct roundingData *, float64, float64 );
|
|
float64 float64_sub( struct roundingData *, float64, float64 );
|
|
float64 float64_mul( struct roundingData *, float64, float64 );
|
|
float64 float64_div( struct roundingData *, float64, float64 );
|
|
float64 float64_rem( struct roundingData *, float64, float64 );
|
|
float64 float64_sqrt( struct roundingData *, float64 );
|
|
char float64_eq( float64, float64 );
|
|
char float64_le( float64, float64 );
|
|
char float64_lt( float64, float64 );
|
|
char float64_eq_signaling( float64, float64 );
|
|
char float64_le_quiet( float64, float64 );
|
|
char float64_lt_quiet( float64, float64 );
|
|
char float64_is_signaling_nan( float64 );
|
|
|
|
#ifdef FLOATX80
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE extended double-precision conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
signed int floatx80_to_int32( struct roundingData *, floatx80 );
|
|
signed int floatx80_to_int32_round_to_zero( floatx80 );
|
|
float32 floatx80_to_float32( struct roundingData *, floatx80 );
|
|
float64 floatx80_to_float64( struct roundingData *, floatx80 );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE extended double-precision operations.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
floatx80 floatx80_round_to_int( struct roundingData *, floatx80 );
|
|
floatx80 floatx80_add( struct roundingData *, floatx80, floatx80 );
|
|
floatx80 floatx80_sub( struct roundingData *, floatx80, floatx80 );
|
|
floatx80 floatx80_mul( struct roundingData *, floatx80, floatx80 );
|
|
floatx80 floatx80_div( struct roundingData *, floatx80, floatx80 );
|
|
floatx80 floatx80_rem( struct roundingData *, floatx80, floatx80 );
|
|
floatx80 floatx80_sqrt( struct roundingData *, floatx80 );
|
|
char floatx80_eq( floatx80, floatx80 );
|
|
char floatx80_le( floatx80, floatx80 );
|
|
char floatx80_lt( floatx80, floatx80 );
|
|
char floatx80_eq_signaling( floatx80, floatx80 );
|
|
char floatx80_le_quiet( floatx80, floatx80 );
|
|
char floatx80_lt_quiet( floatx80, floatx80 );
|
|
char floatx80_is_signaling_nan( floatx80 );
|
|
|
|
#endif
|
|
|
|
static inline flag extractFloat32Sign(float32 a)
|
|
{
|
|
return a >> 31;
|
|
}
|
|
|
|
static inline flag float32_eq_nocheck(float32 a, float32 b)
|
|
{
|
|
return (a == b) || ((bits32) ((a | b) << 1) == 0);
|
|
}
|
|
|
|
static inline flag float32_lt_nocheck(float32 a, float32 b)
|
|
{
|
|
flag aSign, bSign;
|
|
|
|
aSign = extractFloat32Sign(a);
|
|
bSign = extractFloat32Sign(b);
|
|
if (aSign != bSign)
|
|
return aSign && ((bits32) ((a | b) << 1) != 0);
|
|
return (a != b) && (aSign ^ (a < b));
|
|
}
|
|
|
|
static inline flag extractFloat64Sign(float64 a)
|
|
{
|
|
return a >> 63;
|
|
}
|
|
|
|
static inline flag float64_eq_nocheck(float64 a, float64 b)
|
|
{
|
|
return (a == b) || ((bits64) ((a | b) << 1) == 0);
|
|
}
|
|
|
|
static inline flag float64_lt_nocheck(float64 a, float64 b)
|
|
{
|
|
flag aSign, bSign;
|
|
|
|
aSign = extractFloat64Sign(a);
|
|
bSign = extractFloat64Sign(b);
|
|
if (aSign != bSign)
|
|
return aSign && ((bits64) ((a | b) << 1) != 0);
|
|
return (a != b) && (aSign ^ (a < b));
|
|
}
|
|
|
|
extern flag float32_is_nan( float32 a );
|
|
extern flag float64_is_nan( float64 a );
|
|
|
|
#endif
|