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softfloat: Add float128_to_uint32_round_to_zero()

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float128_to_uint32_round_to_zero() is needed by xscvqpuwz instruction
of PowerPC ISA 3.0.

Backports commit fd425037d25cecaaffdb3831697e0adc10ca2ba3 from qemu
This commit is contained in:
Bharata B Rao 2018-03-02 08:33:07 -05:00 committed by Lioncash
parent 64d32a2237
commit 7fadaf0bc4
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 29 additions and 0 deletions
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28
qemu/fpu/softfloat.c
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@ -6133,6 +6133,34 @@ uint64_t float128_to_uint64_round_to_zero(float128 a, float_status *status)
return v;
}
/*----------------------------------------------------------------------------
| 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 except that the conversion is always rounded toward zero.
| If `a' is a NaN, the largest positive integer is returned. Otherwise,
| 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_round_to_zero(float128 a, float_status *status)
{
uint64_t v;
uint32_t res;
int old_exc_flags = get_float_exception_flags(status);
v = float128_to_uint64_round_to_zero(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

@ -703,6 +703,7 @@ 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_round_to_zero(float128, float_status *status);
float32 float128_to_float32(float128, float_status *status);
float64 float128_to_float64(float128, float_status *status);
floatx80 float128_to_floatx80(float128, float_status *status);