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softfloat: Add float_round_nearest_even_max

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This rounding mode is used by Hexagon.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-08 08:54:41 -06:00
parent 6a243913aa
commit 72330260cd
2 changed files with 5 additions and 0 deletions
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3
fpu/softfloat-parts.c.inc
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@ -241,6 +241,9 @@ static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
int exp, flags = 0; int exp, flags = 0;
switch (s->float_rounding_mode) { switch (s->float_rounding_mode) {
case float_round_nearest_even_max:
overflow_norm = true;
/* fall through */
case float_round_nearest_even: case float_round_nearest_even:
if (N > 64 && frac_lsb == 0) { if (N > 64 && frac_lsb == 0) {
inc = ((p->frac_hi & 1) || (p->frac_lo & round_mask) != frac_lsbm1 inc = ((p->frac_hi & 1) || (p->frac_lo & round_mask) != frac_lsbm1

2
include/fpu/softfloat-types.h
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@ -140,6 +140,8 @@ typedef enum __attribute__((__packed__)) {
float_round_to_odd = 5, float_round_to_odd = 5,
/* Not an IEEE rounding mode: round to closest odd, overflow to inf */ /* Not an IEEE rounding mode: round to closest odd, overflow to inf */
float_round_to_odd_inf = 6, float_round_to_odd_inf = 6,
/* Not an IEEE rounding mode: round to nearest even, overflow to max */
float_round_nearest_even_max = 7,
} FloatRoundMode; } FloatRoundMode;
/* /*