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fpu/softfloat: re-factor mul
We can now add float16_mul and use the common decompose and canonicalize functions to have a single implementation for float16/32/64 versions. Backports commit 74d707e2cc1e406068acad8e5559cd2584b1073a from qemu
This commit is contained in:
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58defd9bc0
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2bb86e1efc
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_aarch64
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#define float16_is_signaling_nan float16_is_signaling_nan_aarch64
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#define float16_maybe_silence_nan float16_maybe_silence_nan_aarch64
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#define float16_mul float16_mul_aarch64
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#define float16_squash_input_denormal float16_squash_input_denormal_aarch64
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#define float16_sub float16_sub_aarch64
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#define float16_to_float32 float16_to_float32_aarch64
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_aarch64eb
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#define float16_is_signaling_nan float16_is_signaling_nan_aarch64eb
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#define float16_maybe_silence_nan float16_maybe_silence_nan_aarch64eb
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#define float16_mul float16_mul_aarch64eb
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#define float16_squash_input_denormal float16_squash_input_denormal_aarch64eb
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#define float16_sub float16_sub_aarch64eb
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#define float16_to_float32 float16_to_float32_aarch64eb
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_arm
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#define float16_is_signaling_nan float16_is_signaling_nan_arm
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#define float16_maybe_silence_nan float16_maybe_silence_nan_arm
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#define float16_mul float16_mul_arm
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#define float16_squash_input_denormal float16_squash_input_denormal_arm
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#define float16_sub float16_sub_arm
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#define float16_to_float32 float16_to_float32_arm
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_armeb
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#define float16_is_signaling_nan float16_is_signaling_nan_armeb
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#define float16_maybe_silence_nan float16_maybe_silence_nan_armeb
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#define float16_mul float16_mul_armeb
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#define float16_squash_input_denormal float16_squash_input_denormal_armeb
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#define float16_sub float16_sub_armeb
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#define float16_to_float32 float16_to_float32_armeb
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@ -735,6 +735,87 @@ float64 QEMU_FLATTEN float64_sub(float64 a, float64 b,
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return float64_round_pack_canonical(pr, status);
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}
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/*
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* Returns the result of multiplying the floating-point values `a' and
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* `b'. The operation is performed according to the IEC/IEEE Standard
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* for Binary Floating-Point Arithmetic.
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*/
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static FloatParts mul_floats(FloatParts a, FloatParts b, float_status *s)
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{
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bool sign = a.sign ^ b.sign;
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if (a.cls == float_class_normal && b.cls == float_class_normal) {
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uint64_t hi, lo;
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int exp = a.exp + b.exp;
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mul64To128(a.frac, b.frac, &hi, &lo);
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shift128RightJamming(hi, lo, DECOMPOSED_BINARY_POINT, &hi, &lo);
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if (lo & DECOMPOSED_OVERFLOW_BIT) {
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shift64RightJamming(lo, 1, &lo);
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exp += 1;
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}
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/* Re-use a */
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a.exp = exp;
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a.sign = sign;
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a.frac = lo;
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return a;
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}
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/* handle all the NaN cases */
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if (is_nan(a.cls) || is_nan(b.cls)) {
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return pick_nan(a, b, s);
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}
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/* Inf * Zero == NaN */
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if ((a.cls == float_class_inf && b.cls == float_class_zero) ||
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(a.cls == float_class_zero && b.cls == float_class_inf)) {
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s->float_exception_flags |= float_flag_invalid;
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a.cls = float_class_dnan;
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a.sign = sign;
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return a;
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}
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/* Multiply by 0 or Inf */
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if (a.cls == float_class_inf || a.cls == float_class_zero) {
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a.sign = sign;
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return a;
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}
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if (b.cls == float_class_inf || b.cls == float_class_zero) {
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b.sign = sign;
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return b;
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}
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g_assert_not_reached();
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}
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float16 QEMU_FLATTEN float16_mul(float16 a, float16 b,
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float_status *status)
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{
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FloatParts pa = float16_unpack_canonical(a, status);
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FloatParts pb = float16_unpack_canonical(b, status);
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FloatParts pr = mul_floats(pa, pb, status);
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return float16_round_pack_canonical(pr, status);
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}
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float32 QEMU_FLATTEN float32_mul(float32 a, float32 b,
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float_status *status)
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{
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FloatParts pa = float32_unpack_canonical(a, status);
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FloatParts pb = float32_unpack_canonical(b, status);
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FloatParts pr = mul_floats(pa, pb, status);
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return float32_round_pack_canonical(pr, status);
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}
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float64 QEMU_FLATTEN float64_mul(float64 a, float64 b,
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float_status *status)
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{
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FloatParts pa = float64_unpack_canonical(a, status);
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FloatParts pb = float64_unpack_canonical(b, status);
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FloatParts pr = mul_floats(pa, pb, status);
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return float64_round_pack_canonical(pr, status);
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}
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/*----------------------------------------------------------------------------
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| Takes a 64-bit fixed-point value `absZ' with binary point between bits 6
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| and 7, and returns the properly rounded 32-bit integer corresponding to the
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@ -2515,72 +2596,6 @@ float32 float32_round_to_int(float32 a, float_status *status)
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}
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/*----------------------------------------------------------------------------
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| Returns the result of multiplying the single-precision floating-point values
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| `a' and `b'. The operation is performed according to the IEC/IEEE Standard
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| for Binary Floating-Point Arithmetic.
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*----------------------------------------------------------------------------*/
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float32 float32_mul(float32 a, float32 b, float_status *status)
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{
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flag aSign, bSign, zSign;
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int aExp, bExp, zExp;
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uint32_t aSig, bSig;
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uint64_t zSig64;
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uint32_t zSig;
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a = float32_squash_input_denormal(a, status);
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b = float32_squash_input_denormal(b, 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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bSig = extractFloat32Frac( b );
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bExp = extractFloat32Exp( b );
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bSign = extractFloat32Sign( b );
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zSign = aSign ^ bSign;
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if ( aExp == 0xFF ) {
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if ( aSig || ( ( bExp == 0xFF ) && bSig ) ) {
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return propagateFloat32NaN(a, b, status);
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}
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if ( ( bExp | bSig ) == 0 ) {
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float_raise(float_flag_invalid, status);
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return float32_default_nan(status);
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}
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return packFloat32( zSign, 0xFF, 0 );
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}
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if ( bExp == 0xFF ) {
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if (bSig) {
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return propagateFloat32NaN(a, b, status);
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}
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if ( ( aExp | aSig ) == 0 ) {
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float_raise(float_flag_invalid, status);
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return float32_default_nan(status);
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}
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return packFloat32( zSign, 0xFF, 0 );
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}
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if ( aExp == 0 ) {
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if ( aSig == 0 ) return packFloat32( zSign, 0, 0 );
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normalizeFloat32Subnormal( aSig, &aExp, &aSig );
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}
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if ( bExp == 0 ) {
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if ( bSig == 0 ) return packFloat32( zSign, 0, 0 );
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normalizeFloat32Subnormal( bSig, &bExp, &bSig );
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}
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zExp = aExp + bExp - 0x7F;
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aSig = ( aSig | 0x00800000 )<<7;
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bSig = ( bSig | 0x00800000 )<<8;
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shift64RightJamming( ( (uint64_t) aSig ) * bSig, 32, &zSig64 );
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zSig = (uint32_t)zSig64;
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if ( 0 <= (int32_t) ( zSig<<1 ) ) {
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zSig <<= 1;
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--zExp;
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}
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return roundAndPackFloat32( zSign, zExp, zSig, status );
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}
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/*----------------------------------------------------------------------------
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| Returns the result of dividing the single-precision floating-point value `a'
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| by the corresponding value `b'. The operation is performed according to the
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@ -4109,69 +4124,6 @@ float64 float64_trunc_to_int(float64 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 multiplying the double-precision floating-point values
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| `a' and `b'. The operation is performed according to the IEC/IEEE Standard
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| for Binary Floating-Point Arithmetic.
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*----------------------------------------------------------------------------*/
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float64 float64_mul(float64 a, float64 b, float_status *status)
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{
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flag aSign, bSign, zSign;
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int aExp, bExp, zExp;
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uint64_t aSig, bSig, zSig0, zSig1;
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a = float64_squash_input_denormal(a, status);
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b = float64_squash_input_denormal(b, 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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bSig = extractFloat64Frac( b );
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bExp = extractFloat64Exp( b );
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bSign = extractFloat64Sign( b );
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zSign = aSign ^ bSign;
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if ( aExp == 0x7FF ) {
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if ( aSig || ( ( bExp == 0x7FF ) && bSig ) ) {
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return propagateFloat64NaN(a, b, status);
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}
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if ( ( bExp | bSig ) == 0 ) {
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float_raise(float_flag_invalid, status);
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return float64_default_nan(status);
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}
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return packFloat64( zSign, 0x7FF, 0 );
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}
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if ( bExp == 0x7FF ) {
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if (bSig) {
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return propagateFloat64NaN(a, b, status);
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}
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if ( ( aExp | aSig ) == 0 ) {
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float_raise(float_flag_invalid, status);
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return float64_default_nan(status);
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}
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return packFloat64( zSign, 0x7FF, 0 );
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}
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if ( aExp == 0 ) {
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if ( aSig == 0 ) return packFloat64( zSign, 0, 0 );
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normalizeFloat64Subnormal( aSig, &aExp, &aSig );
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}
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if ( bExp == 0 ) {
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if ( bSig == 0 ) return packFloat64( zSign, 0, 0 );
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normalizeFloat64Subnormal( bSig, &bExp, &bSig );
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}
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zExp = aExp + bExp - 0x3FF;
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aSig = ( aSig | LIT64( 0x0010000000000000 ) )<<10;
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bSig = ( bSig | LIT64( 0x0010000000000000 ) )<<11;
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mul64To128( aSig, bSig, &zSig0, &zSig1 );
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zSig0 |= ( zSig1 != 0 );
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if ( 0 <= (int64_t) ( zSig0<<1 ) ) {
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zSig0 <<= 1;
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--zExp;
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}
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return roundAndPackFloat64( zSign, zExp, zSig0, status );
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}
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/*----------------------------------------------------------------------------
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| Returns the result of dividing the double-precision floating-point value `a'
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| by the corresponding value `b'. The operation is performed according to
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@ -498,6 +498,7 @@ symbols = (
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'float16_is_quiet_nan',
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'float16_is_signaling_nan',
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'float16_maybe_silence_nan',
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'float16_mul',
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'float16_squash_input_denormal',
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'float16_sub',
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'float16_to_float32',
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@ -246,6 +246,7 @@ float64 float16_to_float64(float16 a, flag ieee, float_status *status);
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float16 float16_add(float16, float16, float_status *status);
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float16 float16_sub(float16, float16, float_status *status);
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float16 float16_mul(float16, float16, float_status *status);
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int float16_is_quiet_nan(float16, float_status *status);
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int float16_is_signaling_nan(float16, float_status *status);
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_m68k
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#define float16_is_signaling_nan float16_is_signaling_nan_m68k
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#define float16_maybe_silence_nan float16_maybe_silence_nan_m68k
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#define float16_mul float16_mul_m68k
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#define float16_squash_input_denormal float16_squash_input_denormal_m68k
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#define float16_sub float16_sub_m68k
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#define float16_to_float32 float16_to_float32_m68k
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_mips
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#define float16_is_signaling_nan float16_is_signaling_nan_mips
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#define float16_maybe_silence_nan float16_maybe_silence_nan_mips
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#define float16_mul float16_mul_mips
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#define float16_squash_input_denormal float16_squash_input_denormal_mips
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#define float16_sub float16_sub_mips
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#define float16_to_float32 float16_to_float32_mips
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#define float16_is_quiet_nan float16_is_quiet_nan_mips64
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#define float16_is_signaling_nan float16_is_signaling_nan_mips64
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#define float16_maybe_silence_nan float16_maybe_silence_nan_mips64
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#define float16_mul float16_mul_mips64
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#define float16_squash_input_denormal float16_squash_input_denormal_mips64
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#define float16_sub float16_sub_mips64
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#define float16_to_float32 float16_to_float32_mips64
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#define float16_is_quiet_nan float16_is_quiet_nan_mips64el
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#define float16_is_signaling_nan float16_is_signaling_nan_mips64el
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#define float16_maybe_silence_nan float16_maybe_silence_nan_mips64el
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#define float16_mul float16_mul_mips64el
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#define float16_squash_input_denormal float16_squash_input_denormal_mips64el
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#define float16_sub float16_sub_mips64el
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#define float16_to_float32 float16_to_float32_mips64el
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#define float16_is_quiet_nan float16_is_quiet_nan_mipsel
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#define float16_is_signaling_nan float16_is_signaling_nan_mipsel
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#define float16_maybe_silence_nan float16_maybe_silence_nan_mipsel
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#define float16_mul float16_mul_mipsel
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#define float16_squash_input_denormal float16_squash_input_denormal_mipsel
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#define float16_sub float16_sub_mipsel
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#define float16_to_float32 float16_to_float32_mipsel
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@ -492,6 +492,7 @@
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#define float16_is_quiet_nan float16_is_quiet_nan_powerpc
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#define float16_is_signaling_nan float16_is_signaling_nan_powerpc
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#define float16_maybe_silence_nan float16_maybe_silence_nan_powerpc
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#define float16_mul float16_mul_powerpc
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#define float16_squash_input_denormal float16_squash_input_denormal_powerpc
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#define float16_sub float16_sub_powerpc
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#define float16_to_float32 float16_to_float32_powerpc
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#define float16_is_quiet_nan float16_is_quiet_nan_sparc
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#define float16_is_signaling_nan float16_is_signaling_nan_sparc
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#define float16_maybe_silence_nan float16_maybe_silence_nan_sparc
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#define float16_mul float16_mul_sparc
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#define float16_squash_input_denormal float16_squash_input_denormal_sparc
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#define float16_sub float16_sub_sparc
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#define float16_to_float32 float16_to_float32_sparc
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#define float16_is_quiet_nan float16_is_quiet_nan_sparc64
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#define float16_is_signaling_nan float16_is_signaling_nan_sparc64
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#define float16_maybe_silence_nan float16_maybe_silence_nan_sparc64
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#define float16_mul float16_mul_sparc64
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#define float16_squash_input_denormal float16_squash_input_denormal_sparc64
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#define float16_sub float16_sub_sparc64
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#define float16_to_float32 float16_to_float32_sparc64
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#define float16_is_quiet_nan float16_is_quiet_nan_x86_64
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#define float16_is_signaling_nan float16_is_signaling_nan_x86_64
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#define float16_maybe_silence_nan float16_maybe_silence_nan_x86_64
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#define float16_mul float16_mul_x86_64
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#define float16_squash_input_denormal float16_squash_input_denormal_x86_64
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#define float16_sub float16_sub_x86_64
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#define float16_to_float32 float16_to_float32_x86_64
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