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softfloat: Implement float128_to_uint32

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Handling it just like float128_to_uint32_round_to_zero, that hopefully
is free of bugs :)

Documentation basically copied from float128_to_uint64

Backports commit e45de9922e43c1ce4f4739b62142314a13029d5c from qemu
This commit is contained in:
David Hildenbrand 2019-02-28 15:13:07 -05:00 committed by Lioncash
parent 24a2bd702c
commit 7373819b1a
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2 changed files with 30 additions and 0 deletions
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29
qemu/fpu/softfloat.c
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@ -6784,6 +6784,35 @@ uint32_t float128_to_uint32_round_to_zero(float128 a, float_status *status)
return res;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the quadruple-precision floating-point value
| `a' to the 32-bit unsigned integer format. The conversion is
| performed according to the IEC/IEEE Standard for Binary Floating-Point
| Arithmetic---which means in particular that the conversion is rounded
| according to the current rounding mode. If `a' is a NaN, the largest
| positive integer is returned. If the conversion overflows, the
| largest unsigned integer is returned. If 'a' is negative, the value is
| rounded and zero is returned; negative values that do not round to zero
| will raise the inexact exception.
*----------------------------------------------------------------------------*/
uint32_t float128_to_uint32(float128 a, float_status *status)
{
uint64_t v;
uint32_t res;
int old_exc_flags = get_float_exception_flags(status);
v = float128_to_uint64(a, status);
if (v > 0xffffffff) {
res = 0xffffffff;
} else {
return v;
}
set_float_exception_flags(old_exc_flags, status);
float_raise(float_flag_invalid, status);
return res;
}
/*----------------------------------------------------------------------------
| Returns the result of converting the quadruple-precision floating-point
| value `a' to the single-precision floating-point format. The conversion

1
qemu/include/fpu/softfloat.h
View file

@ -885,6 +885,7 @@ 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);
uint64_t float128_to_uint64_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);
float64 float128_to_float64(float128, float_status *status);