softfloat: Convert float-to-float conversions with float128
Introduce parts_float_to_float_widen and parts_float_to_float_narrow.
Use them for float128_to_float{32,64} and float{32,64}_to_float128.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
parent
c3f1875ea3
commit
9882ccaff9
203
fpu/softfloat.c
203
fpu/softfloat.c
@ -2092,6 +2092,35 @@ static void parts128_float_to_float(FloatParts128 *a, float_status *s)
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#define parts_float_to_float(P, S) \
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PARTS_GENERIC_64_128(float_to_float, P)(P, S)
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static void parts_float_to_float_narrow(FloatParts64 *a, FloatParts128 *b,
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float_status *s)
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{
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a->cls = b->cls;
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a->sign = b->sign;
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a->exp = b->exp;
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if (a->cls == float_class_normal) {
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frac_truncjam(a, b);
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} else if (is_nan(a->cls)) {
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/* Discard the low bits of the NaN. */
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a->frac = b->frac_hi;
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parts_return_nan(a, s);
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}
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}
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static void parts_float_to_float_widen(FloatParts128 *a, FloatParts64 *b,
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float_status *s)
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{
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a->cls = b->cls;
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a->sign = b->sign;
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a->exp = b->exp;
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frac_widen(a, b);
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if (is_nan(a->cls)) {
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parts_return_nan(a, s);
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}
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}
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float32 float16_to_float32(float16 a, bool ieee, float_status *s)
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{
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const FloatFmt *fmt16 = ieee ? &float16_params : &float16_params_ahp;
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@ -2215,6 +2244,46 @@ bfloat16 float64_to_bfloat16(float64 a, float_status *s)
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return bfloat16_round_pack_canonical(&p, s);
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}
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float32 float128_to_float32(float128 a, float_status *s)
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{
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FloatParts64 p64;
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FloatParts128 p128;
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float128_unpack_canonical(&p128, a, s);
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parts_float_to_float_narrow(&p64, &p128, s);
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return float32_round_pack_canonical(&p64, s);
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}
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float64 float128_to_float64(float128 a, float_status *s)
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{
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FloatParts64 p64;
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FloatParts128 p128;
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float128_unpack_canonical(&p128, a, s);
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parts_float_to_float_narrow(&p64, &p128, s);
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return float64_round_pack_canonical(&p64, s);
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}
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float128 float32_to_float128(float32 a, float_status *s)
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{
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FloatParts64 p64;
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FloatParts128 p128;
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float32_unpack_canonical(&p64, a, s);
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parts_float_to_float_widen(&p128, &p64, s);
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return float128_round_pack_canonical(&p128, s);
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}
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float128 float64_to_float128(float64 a, float_status *s)
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{
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FloatParts64 p64;
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FloatParts128 p128;
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float64_unpack_canonical(&p64, a, s);
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parts_float_to_float_widen(&p128, &p64, s);
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return float128_round_pack_canonical(&p128, s);
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}
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/*
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* Rounds the floating-point value `a' to an integer, and returns the
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* result as a floating-point value. The operation is performed
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@ -5175,38 +5244,6 @@ floatx80 float32_to_floatx80(float32 a, float_status *status)
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the double-precision floating-point format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic.
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*----------------------------------------------------------------------------*/
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float128 float32_to_float128(float32 a, float_status *status)
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{
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bool aSign;
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int aExp;
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uint32_t aSig;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac( a );
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aExp = extractFloat32Exp( a );
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aSign = extractFloat32Sign( a );
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if ( aExp == 0xFF ) {
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if (aSig) {
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return commonNaNToFloat128(float32ToCommonNaN(a, status), status);
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}
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return packFloat128( aSign, 0x7FFF, 0, 0 );
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}
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if ( aExp == 0 ) {
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if ( aSig == 0 ) return packFloat128( aSign, 0, 0, 0 );
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normalizeFloat32Subnormal( aSig, &aExp, &aSig );
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--aExp;
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}
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return packFloat128( aSign, aExp + 0x3F80, ( (uint64_t) aSig )<<25, 0 );
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}
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/*----------------------------------------------------------------------------
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| Returns the remainder of the single-precision floating-point value `a'
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| with respect to the corresponding value `b'. The operation is performed
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@ -5480,40 +5517,6 @@ floatx80 float64_to_floatx80(float64 a, float_status *status)
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the double-precision floating-point value
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| `a' to the quadruple-precision floating-point format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic.
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*----------------------------------------------------------------------------*/
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float128 float64_to_float128(float64 a, float_status *status)
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{
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bool aSign;
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int aExp;
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uint64_t aSig, zSig0, zSig1;
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a = float64_squash_input_denormal(a, status);
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aSig = extractFloat64Frac( a );
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aExp = extractFloat64Exp( a );
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aSign = extractFloat64Sign( a );
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if ( aExp == 0x7FF ) {
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if (aSig) {
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return commonNaNToFloat128(float64ToCommonNaN(a, status), status);
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}
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return packFloat128( aSign, 0x7FFF, 0, 0 );
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}
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if ( aExp == 0 ) {
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if ( aSig == 0 ) return packFloat128( aSign, 0, 0, 0 );
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normalizeFloat64Subnormal( aSig, &aExp, &aSig );
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--aExp;
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}
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shift128Right( aSig, 0, 4, &zSig0, &zSig1 );
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return packFloat128( aSign, aExp + 0x3C00, zSig0, zSig1 );
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}
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/*----------------------------------------------------------------------------
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| Returns the remainder of the double-precision floating-point value `a'
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| with respect to the corresponding value `b'. The operation is performed
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@ -6915,74 +6918,6 @@ uint32_t float128_to_uint32(float128 a, float_status *status)
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return res;
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the quadruple-precision floating-point
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| value `a' to the single-precision floating-point format. The conversion
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| is performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic.
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*----------------------------------------------------------------------------*/
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float32 float128_to_float32(float128 a, float_status *status)
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{
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bool aSign;
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int32_t aExp;
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uint64_t aSig0, aSig1;
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uint32_t zSig;
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aSig1 = extractFloat128Frac1( a );
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aSig0 = extractFloat128Frac0( a );
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aExp = extractFloat128Exp( a );
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aSign = extractFloat128Sign( a );
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if ( aExp == 0x7FFF ) {
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if ( aSig0 | aSig1 ) {
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return commonNaNToFloat32(float128ToCommonNaN(a, status), status);
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}
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return packFloat32( aSign, 0xFF, 0 );
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}
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aSig0 |= ( aSig1 != 0 );
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shift64RightJamming( aSig0, 18, &aSig0 );
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zSig = aSig0;
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if ( aExp || zSig ) {
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zSig |= 0x40000000;
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aExp -= 0x3F81;
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}
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return roundAndPackFloat32(aSign, aExp, zSig, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the quadruple-precision floating-point
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| value `a' to the double-precision floating-point format. The conversion
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| is performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic.
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*----------------------------------------------------------------------------*/
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float64 float128_to_float64(float128 a, float_status *status)
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{
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bool aSign;
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int32_t aExp;
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uint64_t aSig0, aSig1;
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aSig1 = extractFloat128Frac1( a );
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aSig0 = extractFloat128Frac0( a );
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aExp = extractFloat128Exp( a );
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aSign = extractFloat128Sign( a );
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if ( aExp == 0x7FFF ) {
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if ( aSig0 | aSig1 ) {
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return commonNaNToFloat64(float128ToCommonNaN(a, status), status);
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}
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return packFloat64( aSign, 0x7FF, 0 );
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}
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shortShift128Left( aSig0, aSig1, 14, &aSig0, &aSig1 );
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aSig0 |= ( aSig1 != 0 );
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if ( aExp || aSig0 ) {
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aSig0 |= UINT64_C(0x4000000000000000);
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aExp -= 0x3C01;
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}
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return roundAndPackFloat64(aSign, aExp, aSig0, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the quadruple-precision floating-point
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| value `a' to the extended double-precision floating-point format. The
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