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softfloat: Convert floatx80_round_to_int to FloatParts

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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-21 13:06:18 -08:00
parent 45a76b71ab
commit f9a95a7800
1 changed files with 13 additions and 103 deletions
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116
fpu/softfloat.c
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@ -2610,6 +2610,19 @@ float128 float128_round_to_int(float128 a, float_status *s)
return float128_round_pack_canonical(&p, s);
}
floatx80 floatx80_round_to_int(floatx80 a, float_status *status)
{
FloatParts128 p;
if (!floatx80_unpack_canonical(&p, a, status)) {
return floatx80_default_nan(status);
}
parts_round_to_int(&p, status->float_rounding_mode, 0, status,
&floatx80_params[status->floatx80_rounding_precision]);
return floatx80_round_pack_canonical(&p, status);
}
/*
* Floating-point to signed integer conversions
*/
@ -5800,109 +5813,6 @@ floatx80 floatx80_round(floatx80 a, float_status *status)
return floatx80_round_pack_canonical(&p, status);
}
/*----------------------------------------------------------------------------
| Rounds the extended double-precision floating-point value `a' to an integer,
| and returns the result as an extended quadruple-precision floating-point
| value. The operation is performed according to the IEC/IEEE Standard for
| Binary Floating-Point Arithmetic.
*----------------------------------------------------------------------------*/
floatx80 floatx80_round_to_int(floatx80 a, float_status *status)
{
bool aSign;
int32_t aExp;
uint64_t lastBitMask, roundBitsMask;
floatx80 z;
if (floatx80_invalid_encoding(a)) {
float_raise(float_flag_invalid, status);
return floatx80_default_nan(status);
}
aExp = extractFloatx80Exp( a );
if ( 0x403E <= aExp ) {
if ( ( aExp == 0x7FFF ) && (uint64_t) ( extractFloatx80Frac( a )<<1 ) ) {
return propagateFloatx80NaN(a, a, status);
}
return a;
}
if ( aExp < 0x3FFF ) {
if ( ( aExp == 0 )
&& ( (uint64_t) ( extractFloatx80Frac( a ) ) == 0 ) ) {
return a;
}
float_raise(float_flag_inexact, status);
aSign = extractFloatx80Sign( a );
switch (status->float_rounding_mode) {
case float_round_nearest_even:
if ( ( aExp == 0x3FFE ) && (uint64_t) ( extractFloatx80Frac( a )<<1 )
) {
return
packFloatx80( aSign, 0x3FFF, UINT64_C(0x8000000000000000));
}
break;
case float_round_ties_away:
if (aExp == 0x3FFE) {
return packFloatx80(aSign, 0x3FFF, UINT64_C(0x8000000000000000));
}
break;
case float_round_down:
return
aSign ?
packFloatx80( 1, 0x3FFF, UINT64_C(0x8000000000000000))
: packFloatx80( 0, 0, 0 );
case float_round_up:
return
aSign ? packFloatx80( 1, 0, 0 )
: packFloatx80( 0, 0x3FFF, UINT64_C(0x8000000000000000));
case float_round_to_zero:
break;
default:
g_assert_not_reached();
}
return packFloatx80( aSign, 0, 0 );
}
lastBitMask = 1;
lastBitMask <<= 0x403E - aExp;
roundBitsMask = lastBitMask - 1;
z = a;
switch (status->float_rounding_mode) {
case float_round_nearest_even:
z.low += lastBitMask>>1;
if ((z.low & roundBitsMask) == 0) {
z.low &= ~lastBitMask;
}
break;
case float_round_ties_away:
z.low += lastBitMask >> 1;
break;
case float_round_to_zero:
break;
case float_round_up:
if (!extractFloatx80Sign(z)) {
z.low += roundBitsMask;
}
break;
case float_round_down:
if (extractFloatx80Sign(z)) {
z.low += roundBitsMask;
}
break;
default:
abort();
}
z.low &= ~ roundBitsMask;
if ( z.low == 0 ) {
++z.high;
z.low = UINT64_C(0x8000000000000000);
}
if (z.low != a.low) {
float_raise(float_flag_inexact, status);
}
return z;
}
/*----------------------------------------------------------------------------
| Returns the remainder of the extended double-precision floating-point value
| `a' with respect to the corresponding value `b'. The operation is performed