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softfloat: Reduce FloatFmt

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Remove frac_lsb, frac_lsbm1, roundeven_mask.  Compute
these from round_mask in parts$N_uncanon_normal.

With floatx80, round_mask will not be tied to frac_shift.
Everything else is easily computable.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-20 18:28:31 -08:00
parent 25fdedf0d3
commit d6e1f0cd59
2 changed files with 15 additions and 20 deletions
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6
fpu/softfloat-parts.c.inc
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@ -145,10 +145,10 @@ static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
{
const int exp_max = fmt->exp_max;
const int frac_shift = fmt->frac_shift;
const uint64_t frac_lsb = fmt->frac_lsb;
const uint64_t frac_lsbm1 = fmt->frac_lsbm1;
const uint64_t round_mask = fmt->round_mask;
const uint64_t roundeven_mask = fmt->roundeven_mask;
const uint64_t frac_lsb = round_mask + 1;
const uint64_t frac_lsbm1 = round_mask ^ (round_mask >> 1);
const uint64_t roundeven_mask = round_mask | frac_lsb;
uint64_t inc;
bool overflow_norm = false;
int exp, flags = 0;