mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

softfloat: add NO_SIGNALING_NANS

Browse Source 
Architectures that don't have signaling NaNs can define
NO_SIGNALING_NANS, it will make float*_is_quiet_nan return 1 for any NaN
and float*_is_signaling_nan always return 0.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2012-09-19 04:23:51 +04:00 committed by Blue Swirl
parent 6617680296
commit 213ff4e6df
2 changed files with 72 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
fpu/softfloat-specialize.h
View File

@ -41,6 +41,13 @@ these four paragraphs for those parts of this code that are retained.
#define SNAN_BIT_IS_ONE 0
#endif
#if defined(TARGET_XTENSA)
/* Define for architectures which deviate from IEEE in not supporting
* signaling NaNs (so all NaNs are treated as quiet).
*/
#define NO_SIGNALING_NANS 1
#endif
/*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/
@ -127,6 +134,17 @@ typedef struct {
uint64_t high, low;
} commonNaNT;
#ifdef NO_SIGNALING_NANS
int float16_is_quiet_nan(float16 a_)
{
return float16_is_any_nan(a_);
}
int float16_is_signaling_nan(float16 a_)
{
return 0;
}
#else
/*----------------------------------------------------------------------------
| Returns 1 if the half-precision floating-point value `a' is a quiet
| NaN; otherwise returns 0.
@ -156,6 +174,7 @@ int float16_is_signaling_nan(float16 a_)
return (((a >> 9) & 0x3F) == 0x3E) && (a & 0x1FF);
#endif
}
#endif
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the half-precision floating point value `a' is a
@ -217,6 +236,17 @@ static float16 commonNaNToFloat16(commonNaNT a STATUS_PARAM)
}
}
#ifdef NO_SIGNALING_NANS
int float32_is_quiet_nan(float32 a_)
{
return float32_is_any_nan(a_);
}
int float32_is_signaling_nan(float32 a_)
{
return 0;
}
#else
/*----------------------------------------------------------------------------
| Returns 1 if the single-precision floating-point value `a' is a quiet
| NaN; otherwise returns 0.
@ -246,6 +276,7 @@ int float32_is_signaling_nan( float32 a_ )
return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
#endif
}
#endif
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the single-precision floating point value `a' is a
@ -586,6 +617,17 @@ static float32 propagateFloat32MulAddNaN(float32 a, float32 b,
}
}
#ifdef NO_SIGNALING_NANS
int float64_is_quiet_nan(float64 a_)
{
return float64_is_any_nan(a_);
}
int float64_is_signaling_nan(float64 a_)
{
return 0;
}
#else
/*----------------------------------------------------------------------------
| Returns 1 if the double-precision floating-point value `a' is a quiet
| NaN; otherwise returns 0.
@ -619,6 +661,7 @@ int float64_is_signaling_nan( float64 a_ )
&& ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
#endif
}
#endif
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the double-precision floating point value `a' is a
@ -773,6 +816,17 @@ static float64 propagateFloat64MulAddNaN(float64 a, float64 b,
}
}
#ifdef NO_SIGNALING_NANS
int floatx80_is_quiet_nan(floatx80 a_)
{
return floatx80_is_any_nan(a_);
}
int floatx80_is_signaling_nan(floatx80 a_)
{
return 0;
}
#else
/*----------------------------------------------------------------------------
| Returns 1 if the extended double-precision floating-point value `a' is a
| quiet NaN; otherwise returns 0. This slightly differs from the same
@ -816,6 +870,7 @@ int floatx80_is_signaling_nan( floatx80 a )
&& ( a.low == aLow );
#endif
}
#endif
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the extended double-precision floating point value
@ -929,6 +984,17 @@ static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
}
}
#ifdef NO_SIGNALING_NANS
int float128_is_quiet_nan(float128 a_)
{
return float128_is_any_nan(a_);
}
int float128_is_signaling_nan(float128 a_)
{
return 0;
}
#else
/*----------------------------------------------------------------------------
| Returns 1 if the quadruple-precision floating-point value `a' is a quiet
| NaN; otherwise returns 0.
@ -964,6 +1030,7 @@ int float128_is_signaling_nan( float128 a )
&& ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
#endif
}
#endif
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the quadruple-precision floating point value `a' is

5
fpu/softfloat.h
View File

@ -251,6 +251,11 @@ int float16_is_quiet_nan( float16 );
int float16_is_signaling_nan( float16 );
float16 float16_maybe_silence_nan( float16 );
INLINE int float16_is_any_nan(float16 a)
{
return ((float16_val(a) & ~0x8000) > 0x7c00);
}
/*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/