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softfloat: Add float*_maybe_silence_nan() functions 

Add functions float*_maybe_silence_nan() which ensure that a
value is not a signaling NaN by turning it into a quiet NaN.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
This commit is contained in:
Peter Maydell 2010-12-07 15:37:34 +00:00
parent 09d9487fbb
commit b408dbdec3
2 changed files with 40 additions and 0 deletions
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38
fpu/softfloat-specialize.h
View File

@ -101,6 +101,25 @@ int float32_is_signaling_nan( float32 a_ )
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the single-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
float32 float32_maybe_silence_nan( float32 a_ )
{
if (float32_is_signaling_nan(a_)) {
uint32_t a = float32_val(a_);
#if SNAN_BIT_IS_ONE
a &= ~(1 << 22);
#else
a |= (1 << 22);
#endif
return make_float32(a);
}
return a_;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the single-precision floating-point NaN
| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
@ -233,6 +252,25 @@ int float64_is_signaling_nan( float64 a_ )
#endif
}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the double-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
float64 float64_maybe_silence_nan( float64 a_ )
{
if (float64_is_signaling_nan(a_)) {
bits64 a = float64_val(a_);
#if SNAN_BIT_IS_ONE
a &= ~LIT64( 0x0008000000000000 );
#else
a |= LIT64( 0x0008000000000000 );
#endif
return make_float64(a);
}
return a_;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the double-precision floating-point NaN
| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid

2
fpu/softfloat.h
View File

@ -287,6 +287,7 @@ int float32_compare( float32, float32 STATUS_PARAM );
int float32_compare_quiet( float32, float32 STATUS_PARAM );
int float32_is_nan( float32 );
int float32_is_signaling_nan( float32 );
float32 float32_maybe_silence_nan( float32 );
float32 float32_scalbn( float32, int STATUS_PARAM );
INLINE float32 float32_abs(float32 a)
@ -364,6 +365,7 @@ int float64_compare( float64, float64 STATUS_PARAM );
int float64_compare_quiet( float64, float64 STATUS_PARAM );
int float64_is_nan( float64 a );
int float64_is_signaling_nan( float64 );
float64 float64_maybe_silence_nan( float64 );
float64 float64_scalbn( float64, int STATUS_PARAM );
INLINE float64 float64_abs(float64 a)