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softfloat: add float128_to_uint128

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Implements float128_to_uint128 based on parts_float_to_uint logic.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-6-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-03-30 14:59:29 -03:00 committed by Daniel Henrique Barboza
parent 95c1b71e25
commit 4de49ddfac
2 changed files with 67 additions and 0 deletions
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65
fpu/softfloat.c
View File

@ -3480,6 +3480,61 @@ static uint64_t float128_to_uint64_scalbn(float128 a, FloatRoundMode rmode,
return parts_float_to_uint(&p, rmode, scale, UINT64_MAX, s);
}
static Int128 float128_to_uint128_scalbn(float128 a, FloatRoundMode rmode,
int scale, float_status *s)
{
int flags = 0;
Int128 r;
FloatParts128 p;
float128_unpack_canonical(&p, a, s);
switch (p.cls) {
case float_class_snan:
flags |= float_flag_invalid_snan;
/* fall through */
case float_class_qnan:
flags |= float_flag_invalid;
r = UINT128_MAX;
break;
case float_class_inf:
flags = float_flag_invalid | float_flag_invalid_cvti;
r = p.sign ? int128_zero() : UINT128_MAX;
break;
case float_class_zero:
return int128_zero();
case float_class_normal:
if (parts_round_to_int_normal(&p, rmode, scale, 128 - 2)) {
flags = float_flag_inexact;
if (p.cls == float_class_zero) {
r = int128_zero();
break;
}
}
if (p.sign) {
flags = float_flag_invalid | float_flag_invalid_cvti;
r = int128_zero();
} else if (p.exp <= 127) {
int shift = 127 - p.exp;
r = int128_urshift(int128_make128(p.frac_lo, p.frac_hi), shift);
} else {
flags = float_flag_invalid | float_flag_invalid_cvti;
r = UINT128_MAX;
}
break;
default:
g_assert_not_reached();
}
float_raise(flags, s);
return r;
}
uint8_t float16_to_uint8(float16 a, float_status *s)
{
return float16_to_uint8_scalbn(a, s->float_rounding_mode, 0, s);
@ -3540,6 +3595,11 @@ uint64_t float128_to_uint64(float128 a, float_status *s)
return float128_to_uint64_scalbn(a, s->float_rounding_mode, 0, s);
}
Int128 float128_to_uint128(float128 a, float_status *s)
{
return float128_to_uint128_scalbn(a, s->float_rounding_mode, 0, s);
}
uint16_t float16_to_uint16_round_to_zero(float16 a, float_status *s)
{
return float16_to_uint16_scalbn(a, float_round_to_zero, 0, s);
@ -3595,6 +3655,11 @@ uint64_t float128_to_uint64_round_to_zero(float128 a, float_status *s)
return float128_to_uint64_scalbn(a, float_round_to_zero, 0, s);
}
Int128 float128_to_uint128_round_to_zero(float128 a, float_status *s)
{
return float128_to_uint128_scalbn(a, float_round_to_zero, 0, s);
}
uint16_t bfloat16_to_uint16(bfloat16 a, float_status *s)
{
return bfloat16_to_uint16_scalbn(a, s->float_rounding_mode, 0, s);

2
include/fpu/softfloat.h
View File

@ -1206,7 +1206,9 @@ int32_t float128_to_int32_round_to_zero(float128, float_status *status);
int64_t float128_to_int64(float128, float_status *status);
int64_t float128_to_int64_round_to_zero(float128, float_status *status);
uint64_t float128_to_uint64(float128, float_status *status);
Int128 float128_to_uint128(float128, float_status *status);
uint64_t float128_to_uint64_round_to_zero(float128, float_status *status);
Int128 float128_to_uint128_round_to_zero(float128, float_status *status);
uint32_t float128_to_uint32(float128, float_status *status);
uint32_t float128_to_uint32_round_to_zero(float128, float_status *status);
float32 float128_to_float32(float128, float_status *status);