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softfloat: add int128_to_float128

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Based on parts_sint_to_float, implements int128_to_float128 to convert a
signed 128-bit value received through an Int128 argument.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20220330175932.6995-5-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-03-30 14:59:28 -03:00 committed by Daniel Henrique Barboza
parent f279852b89
commit 95c1b71e25
2 changed files with 30 additions and 0 deletions
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29
fpu/softfloat.c
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@ -3780,6 +3780,35 @@ bfloat16 int16_to_bfloat16(int16_t a, float_status *status)
return int64_to_bfloat16_scalbn(a, 0, status);
}
float128 int128_to_float128(Int128 a, float_status *status)
{
FloatParts128 p = { };
int shift;
if (int128_nz(a)) {
p.cls = float_class_normal;
if (!int128_nonneg(a)) {
p.sign = true;
a = int128_neg(a);
}
shift = clz64(int128_gethi(a));
if (shift == 64) {
shift += clz64(int128_getlo(a));
}
p.exp = 127 - shift;
a = int128_lshift(a, shift);
p.frac_hi = int128_gethi(a);
p.frac_lo = int128_getlo(a);
} else {
p.cls = float_class_zero;
}
return float128_round_pack_canonical(&p, status);
}
float128 int64_to_float128(int64_t a, float_status *status)
{
FloatParts128 p;

1
include/fpu/softfloat.h
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@ -183,6 +183,7 @@ floatx80 int64_to_floatx80(int64_t, float_status *status);
float128 int32_to_float128(int32_t, float_status *status);
float128 int64_to_float128(int64_t, float_status *status);
float128 int128_to_float128(Int128, float_status *status);
float128 uint64_to_float128(uint64_t, float_status *status);
float128 uint128_to_float128(Int128, float_status *status);