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softfloat: Correctly handle NaNs in float16_to_float32()

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Correctly handle NaNs in float16_to_float32(), by defining and
using a float16ToCommonNaN() function, as we do with the other formats.

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 11:28:59 +00:00 committed by Aurelien Jarno
parent 600e30d2b2
commit f591e1bedf
2 changed files with 18 additions and 3 deletions
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17
fpu/softfloat-specialize.h
View File

@ -119,6 +119,23 @@ float16 float16_maybe_silence_nan(float16 a_)
return a_;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the half-precision floating-point NaN
| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
| exception is raised.
*----------------------------------------------------------------------------*/
static commonNaNT float16ToCommonNaN( float16 a STATUS_PARAM )
{
commonNaNT z;
if ( float16_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR );
z.sign = float16_val(a) >> 15;
z.low = 0;
z.high = ((bits64) float16_val(a))<<54;
return z;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the canonical NaN `a' to the half-
| precision floating-point format.

4
fpu/softfloat.c
View File

@ -2761,9 +2761,7 @@ float32 float16_to_float32(float16 a, flag ieee STATUS_PARAM)
if (aExp == 0x1f && ieee) {
if (aSig) {
/* Make sure correct exceptions are raised. */
float32ToCommonNaN(a STATUS_VAR);
aSig |= 0x200;
return commonNaNToFloat32(float16ToCommonNaN(a STATUS_VAR) STATUS_VAR);
}
return packFloat32(aSign, 0xff, aSig << 13);
}