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fpu/softfloat: re-factor muladd

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We can now add float16_muladd and use the common decompose and
canonicalize functions to have a single implementation for
float16/32/64 muladd functions.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alex Bennée 2017-11-28 17:04:44 +00:00
parent cf07323d49
commit d446830a3a
3 changed files with 272 additions and 575 deletions
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104
fpu/softfloat-specialize.h
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@ -729,58 +729,6 @@ static float32 propagateFloat32NaN(float32 a, float32 b, float_status *status)
}
}
/*----------------------------------------------------------------------------
| Takes three single-precision floating-point values `a', `b' and `c', one of
| which is a NaN, and returns the appropriate NaN result. If any of `a',
| `b' or `c' is a signaling NaN, the invalid exception is raised.
| The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
| obviously c is a NaN, and whether to propagate c or some other NaN is
| implementation defined).
*----------------------------------------------------------------------------*/
static float32 propagateFloat32MulAddNaN(float32 a, float32 b,
float32 c, flag infzero,
float_status *status)
{
flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
cIsQuietNaN, cIsSignalingNaN;
int which;
aIsQuietNaN = float32_is_quiet_nan(a, status);
aIsSignalingNaN = float32_is_signaling_nan(a, status);
bIsQuietNaN = float32_is_quiet_nan(b, status);
bIsSignalingNaN = float32_is_signaling_nan(b, status);
cIsQuietNaN = float32_is_quiet_nan(c, status);
cIsSignalingNaN = float32_is_signaling_nan(c, status);
if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
float_raise(float_flag_invalid, status);
}
which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN,
bIsQuietNaN, bIsSignalingNaN,
cIsQuietNaN, cIsSignalingNaN, infzero, status);
if (status->default_nan_mode) {
/* Note that this check is after pickNaNMulAdd so that function
* has an opportunity to set the Invalid flag.
*/
return float32_default_nan(status);
}
switch (which) {
case 0:
return float32_maybe_silence_nan(a, status);
case 1:
return float32_maybe_silence_nan(b, status);
case 2:
return float32_maybe_silence_nan(c, status);
case 3:
default:
return float32_default_nan(status);
}
}
#ifdef NO_SIGNALING_NANS
int float64_is_quiet_nan(float64 a_, float_status *status)
{
@ -936,58 +884,6 @@ static float64 propagateFloat64NaN(float64 a, float64 b, float_status *status)
}
}
/*----------------------------------------------------------------------------
| Takes three double-precision floating-point values `a', `b' and `c', one of
| which is a NaN, and returns the appropriate NaN result. If any of `a',
| `b' or `c' is a signaling NaN, the invalid exception is raised.
| The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
| obviously c is a NaN, and whether to propagate c or some other NaN is
| implementation defined).
*----------------------------------------------------------------------------*/
static float64 propagateFloat64MulAddNaN(float64 a, float64 b,
float64 c, flag infzero,
float_status *status)
{
flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
cIsQuietNaN, cIsSignalingNaN;
int which;
aIsQuietNaN = float64_is_quiet_nan(a, status);
aIsSignalingNaN = float64_is_signaling_nan(a, status);
bIsQuietNaN = float64_is_quiet_nan(b, status);
bIsSignalingNaN = float64_is_signaling_nan(b, status);
cIsQuietNaN = float64_is_quiet_nan(c, status);
cIsSignalingNaN = float64_is_signaling_nan(c, status);
if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
float_raise(float_flag_invalid, status);
}
which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN,
bIsQuietNaN, bIsSignalingNaN,
cIsQuietNaN, cIsSignalingNaN, infzero, status);
if (status->default_nan_mode) {
/* Note that this check is after pickNaNMulAdd so that function
* has an opportunity to set the Invalid flag.
*/
return float64_default_nan(status);
}
switch (which) {
case 0:
return float64_maybe_silence_nan(a, status);
case 1:
return float64_maybe_silence_nan(b, status);
case 2:
return float64_maybe_silence_nan(c, status);
case 3:
default:
return float64_default_nan(status);
}
}
#ifdef NO_SIGNALING_NANS
int floatx80_is_quiet_nan(floatx80 a_, float_status *status)
{