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softfloat: add uint128_to_float128

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Based on parts_uint_to_float, implements uint128_to_float128 to convert
an unsigned 128-bit value received through an Int128 argument.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-4-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-03-30 14:59:27 -03:00 committed by Daniel Henrique Barboza
parent 613cf0fcba
commit f279852b89
2 changed files with 27 additions and 0 deletions
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25
fpu/softfloat.c
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@ -3969,6 +3969,31 @@ float128 uint64_to_float128(uint64_t a, float_status *status)
return float128_round_pack_canonical(&p, status);
}
float128 uint128_to_float128(Int128 a, float_status *status)
{
FloatParts128 p = { };
int shift;
if (int128_nz(a)) {
p.cls = float_class_normal;
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);
}
/*
* Minimum and maximum
*/

2
include/fpu/softfloat.h
View file

@ -95,6 +95,7 @@ typedef enum {
#include "fpu/softfloat-types.h"
#include "fpu/softfloat-helpers.h"
#include "qemu/int128.h"
/*----------------------------------------------------------------------------
| Routine to raise any or all of the software IEC/IEEE floating-point
@ -183,6 +184,7 @@ 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 uint64_to_float128(uint64_t, float_status *status);
float128 uint128_to_float128(Int128, float_status *status);
/*----------------------------------------------------------------------------
| Software half-precision conversion routines.