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fpu/softfloat: re-factor float to float conversions

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This allows us to delete a lot of additional boilerplate
code which is no longer needed.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2018-03-16 16:45:02 +00:00 • committed by Richard Henderson
parent ca3a3d5a31
commit 6fed16b265
3 changed files with 122 additions and 414 deletions
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40
fpu/softfloat-specialize.h
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@ -377,46 +377,6 @@ float16 float16_maybe_silence_nan(float16 a, float_status *status)
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, float_status *status)
{
commonNaNT z;
if (float16_is_signaling_nan(a, status)) {
float_raise(float_flag_invalid, status);
}
z.sign = float16_val(a) >> 15;
z.low = 0;
z.high = ((uint64_t) float16_val(a)) << 54;
return z;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the canonical NaN `a' to the half-
| precision floating-point format.
*----------------------------------------------------------------------------*/
static float16 commonNaNToFloat16(commonNaNT a, float_status *status)
{
uint16_t mantissa = a.high >> 54;
if (status->default_nan_mode) {
return float16_default_nan(status);
}
if (mantissa) {
return make_float16(((((uint16_t) a.sign) << 15)
| (0x1F << 10) | mantissa));
} else {
return float16_default_nan(status);
}
}
/*----------------------------------------------------------------------------
| Returns 1 if the single-precision floating-point value `a' is a quiet
| NaN; otherwise returns 0.