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fpu: Introduce parts64_round_to_fmt

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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
2026-04-25 22:15:21 +10:00
parent e63e64b528
commit 3d952d7cb5
2 changed files with 22 additions and 3 deletions
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22
fpu/softfloat.c
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@@ -1396,6 +1396,24 @@ float64 float64_round_pack_canonical(FloatParts64 *p, float_status *s)
return pack_raw64(p, &float64_params);
}
/*
* Round to Fmt while remaining canonicalized.
*/
FloatParts64 parts64_round_to_fmt(const FloatParts64 *p, float_status *s,
const FloatFmt *fmt)
{
FloatParts64 r = *p;
parts64_uncanon(&r, s, fmt, false);
/*
* We normally expect uncanon to be followed by pack_raw,
* so we don't actually crop the bits. Do so now.
*/
r.frac &= MAKE_64BIT_MASK(0, fmt->frac_size);
parts64_canonicalize(&r, s, fmt);
return r;
}
static float64 float64r32_pack_raw(FloatParts64 *p)
{
/*
@@ -5176,10 +5194,8 @@ static void parts_s390_divide_to_integer(FloatParts64 *a, FloatParts64 *b,
/* Round remainder to the target format */
*r = *r_precise;
status->float_exception_flags = 0;
parts64_uncanon(r, status, fmt, false);
*r = parts64_round_to_fmt(r, status, fmt);
r_flags = status->float_exception_flags;
r->frac &= (1ULL << fmt->frac_size) - 1;
parts64_canonicalize(r, status, fmt);
/* POp table "Results: DIVIDE TO INTEGER (Part 2 of 2)" */
if (is_q_smallish) {

3
include/fpu/softfloat-parts.h
View File

@@ -196,4 +196,7 @@ FloatParts128 parts128_round_to_int(const FloatParts128 *a,
int scale, float_status *s,
const FloatFmt *fmt);
FloatParts64 parts64_round_to_fmt(const FloatParts64 *p, float_status *s,
const FloatFmt *fmt);
#endif