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softfloat: Add float16 type and float16 NaN handling functions

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Add a float16 type to softfloat, rather than using bits16 directly.
Also add the missing functions float16_is_quiet_nan(),
float16_is_signaling_nan() and float16_maybe_silence_nan(),
which are needed for the float16 conversion routines.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-02-10 11:28:56 +00:00 • committed by Aurelien Jarno
parent d1a1eb7472
commit bb4d4bb376
4 changed files with 118 additions and 12 deletions
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19
fpu/softfloat.h
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@ -119,6 +119,11 @@ enum {
x86/gcc 3.x seems to struggle a bit, so leave them disabled by default. */
//#define USE_SOFTFLOAT_STRUCT_TYPES
#ifdef USE_SOFTFLOAT_STRUCT_TYPES
typedef struct {
uint16_t v;
} float16;
#define float16_val(x) (((float16)(x)).v)
#define make_float16(x) __extension__ ({ float16 f16_val = {x}; f16_val; })
typedef struct {
uint32_t v;
} float32;
@ -131,10 +136,13 @@ typedef struct {
#define float64_val(x) (((float64)(x)).v)
#define make_float64(x) __extension__ ({ float64 f64_val = {x}; f64_val; })
#else
typedef uint16_t float16;
typedef uint32_t float32;
typedef uint64_t float64;
#define float16_val(x) (x)
#define float32_val(x) (x)
#define float64_val(x) (x)
#define make_float16(x) (x)
#define make_float32(x) (x)
#define make_float64(x) (x)
#endif
@ -253,8 +261,15 @@ float128 int64_to_float128( int64_t STATUS_PARAM );
/*----------------------------------------------------------------------------
| Software half-precision conversion routines.
*----------------------------------------------------------------------------*/
bits16 float32_to_float16( float32, flag STATUS_PARAM );
float32 float16_to_float32( bits16, flag STATUS_PARAM );
float16 float32_to_float16( float32, flag STATUS_PARAM );
float32 float16_to_float32( float16, flag STATUS_PARAM );
/*----------------------------------------------------------------------------
| Software half-precision operations.
*----------------------------------------------------------------------------*/
int float16_is_quiet_nan( float16 );
int float16_is_signaling_nan( float16 );
float16 float16_maybe_silence_nan( float16 );
/*----------------------------------------------------------------------------
| Software IEC/IEEE single-precision conversion routines.