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softfloat: Move sf_canonicalize to softfloat-parts.c.inc

Browse source 
At the same time, convert to pointers, rename to parts$N_canonicalize
and define a macro for parts_canonicalize using QEMU_GENERIC.

Rearrange the cases to recognize float_class_normal as
early as possible.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-08 13:01:55 -08:00
parent 979582d071
commit d46975bce1
2 changed files with 112 additions and 38 deletions
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33
fpu/softfloat-parts.c.inc
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@ -100,3 +100,36 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
}
return a;
}
/*
* Canonicalize the FloatParts structure. Determine the class,
* unbias the exponent, and normalize the fraction.
*/
static void partsN(canonicalize)(FloatPartsN *p, float_status *status,
const FloatFmt *fmt)
{
if (unlikely(p->exp == 0)) {
if (likely(frac_eqz(p))) {
p->cls = float_class_zero;
} else if (status->flush_inputs_to_zero) {
float_raise(float_flag_input_denormal, status);
p->cls = float_class_zero;
frac_clear(p);
} else {
int shift = frac_normalize(p);
p->cls = float_class_normal;
p->exp = fmt->frac_shift - fmt->exp_bias - shift + 1;
}
} else if (likely(p->exp < fmt->exp_max) || fmt->arm_althp) {
p->cls = float_class_normal;
p->exp -= fmt->exp_bias;
frac_shl(p, fmt->frac_shift);
p->frac_hi |= DECOMPOSED_IMPLICIT_BIT;
} else if (likely(frac_eqz(p))) {
p->cls = float_class_inf;
} else {
frac_shl(p, fmt->frac_shift);
p->cls = (parts_is_snan_frac(p->frac_hi, status)
? float_class_snan : float_class_qnan);
}
}