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-rw-r--r--fpu/softfloat.c257
1 files changed, 36 insertions, 221 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index afeef00097..8f734f6020 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1046,6 +1046,20 @@ static float64 float64_round_pack_canonical(FloatParts64 *p,
return float64_pack_raw(p);
}
+static void float128_unpack_canonical(FloatParts128 *p, float128 f,
+ float_status *s)
+{
+ float128_unpack_raw(p, f);
+ parts_canonicalize(p, s, &float128_params);
+}
+
+static float128 float128_round_pack_canonical(FloatParts128 *p,
+ float_status *s)
+{
+ parts_uncanon(p, s, &float128_params);
+ return float128_pack_raw(p);
+}
+
/*
* Addition and subtraction
*/
@@ -1213,6 +1227,28 @@ bfloat16 bfloat16_sub(bfloat16 a, bfloat16 b, float_status *status)
return bfloat16_addsub(a, b, status, true);
}
+static float128 QEMU_FLATTEN
+float128_addsub(float128 a, float128 b, float_status *status, bool subtract)
+{
+ FloatParts128 pa, pb, *pr;
+
+ float128_unpack_canonical(&pa, a, status);
+ float128_unpack_canonical(&pb, b, status);
+ pr = parts_addsub(&pa, &pb, status, subtract);
+
+ return float128_round_pack_canonical(pr, status);
+}
+
+float128 float128_add(float128 a, float128 b, float_status *status)
+{
+ return float128_addsub(a, b, status, false);
+}
+
+float128 float128_sub(float128 a, float128 b, float_status *status)
+{
+ return float128_addsub(a, b, status, true);
+}
+
/*
* Returns the result of multiplying the floating-point values `a' and
* `b'. The operation is performed according to the IEC/IEEE Standard
@@ -7033,227 +7069,6 @@ float128 float128_round_to_int(float128 a, float_status *status)
}
/*----------------------------------------------------------------------------
-| Returns the result of adding the absolute values of the quadruple-precision
-| floating-point values `a' and `b'. If `zSign' is 1, the sum is negated
-| before being returned. `zSign' is ignored if the result is a NaN.
-| The addition is performed according to the IEC/IEEE Standard for Binary
-| Floating-Point Arithmetic.
-*----------------------------------------------------------------------------*/
-
-static float128 addFloat128Sigs(float128 a, float128 b, bool zSign,
- float_status *status)
-{
- int32_t aExp, bExp, zExp;
- uint64_t aSig0, aSig1, bSig0, bSig1, zSig0, zSig1, zSig2;
- int32_t expDiff;
-
- aSig1 = extractFloat128Frac1( a );
- aSig0 = extractFloat128Frac0( a );
- aExp = extractFloat128Exp( a );
- bSig1 = extractFloat128Frac1( b );
- bSig0 = extractFloat128Frac0( b );
- bExp = extractFloat128Exp( b );
- expDiff = aExp - bExp;
- if ( 0 < expDiff ) {
- if ( aExp == 0x7FFF ) {
- if (aSig0 | aSig1) {
- return propagateFloat128NaN(a, b, status);
- }
- return a;
- }
- if ( bExp == 0 ) {
- --expDiff;
- }
- else {
- bSig0 |= UINT64_C(0x0001000000000000);
- }
- shift128ExtraRightJamming(
- bSig0, bSig1, 0, expDiff, &bSig0, &bSig1, &zSig2 );
- zExp = aExp;
- }
- else if ( expDiff < 0 ) {
- if ( bExp == 0x7FFF ) {
- if (bSig0 | bSig1) {
- return propagateFloat128NaN(a, b, status);
- }
- return packFloat128( zSign, 0x7FFF, 0, 0 );
- }
- if ( aExp == 0 ) {
- ++expDiff;
- }
- else {
- aSig0 |= UINT64_C(0x0001000000000000);
- }
- shift128ExtraRightJamming(
- aSig0, aSig1, 0, - expDiff, &aSig0, &aSig1, &zSig2 );
- zExp = bExp;
- }
- else {
- if ( aExp == 0x7FFF ) {
- if ( aSig0 | aSig1 | bSig0 | bSig1 ) {
- return propagateFloat128NaN(a, b, status);
- }
- return a;
- }
- add128( aSig0, aSig1, bSig0, bSig1, &zSig0, &zSig1 );
- if ( aExp == 0 ) {
- if (status->flush_to_zero) {
- if (zSig0 | zSig1) {
- float_raise(float_flag_output_denormal, status);
- }
- return packFloat128(zSign, 0, 0, 0);
- }
- return packFloat128( zSign, 0, zSig0, zSig1 );
- }
- zSig2 = 0;
- zSig0 |= UINT64_C(0x0002000000000000);
- zExp = aExp;
- goto shiftRight1;
- }
- aSig0 |= UINT64_C(0x0001000000000000);
- add128( aSig0, aSig1, bSig0, bSig1, &zSig0, &zSig1 );
- --zExp;
- if ( zSig0 < UINT64_C(0x0002000000000000) ) goto roundAndPack;
- ++zExp;
- shiftRight1:
- shift128ExtraRightJamming(
- zSig0, zSig1, zSig2, 1, &zSig0, &zSig1, &zSig2 );
- roundAndPack:
- return roundAndPackFloat128(zSign, zExp, zSig0, zSig1, zSig2, status);
-
-}
-
-/*----------------------------------------------------------------------------
-| Returns the result of subtracting the absolute values of the quadruple-
-| precision floating-point values `a' and `b'. If `zSign' is 1, the
-| difference is negated before being returned. `zSign' is ignored if the
-| result is a NaN. The subtraction is performed according to the IEC/IEEE
-| Standard for Binary Floating-Point Arithmetic.
-*----------------------------------------------------------------------------*/
-
-static float128 subFloat128Sigs(float128 a, float128 b, bool zSign,
- float_status *status)
-{
- int32_t aExp, bExp, zExp;
- uint64_t aSig0, aSig1, bSig0, bSig1, zSig0, zSig1;
- int32_t expDiff;
-
- aSig1 = extractFloat128Frac1( a );
- aSig0 = extractFloat128Frac0( a );
- aExp = extractFloat128Exp( a );
- bSig1 = extractFloat128Frac1( b );
- bSig0 = extractFloat128Frac0( b );
- bExp = extractFloat128Exp( b );
- expDiff = aExp - bExp;
- shortShift128Left( aSig0, aSig1, 14, &aSig0, &aSig1 );
- shortShift128Left( bSig0, bSig1, 14, &bSig0, &bSig1 );
- if ( 0 < expDiff ) goto aExpBigger;
- if ( expDiff < 0 ) goto bExpBigger;
- if ( aExp == 0x7FFF ) {
- if ( aSig0 | aSig1 | bSig0 | bSig1 ) {
- return propagateFloat128NaN(a, b, status);
- }
- float_raise(float_flag_invalid, status);
- return float128_default_nan(status);
- }
- if ( aExp == 0 ) {
- aExp = 1;
- bExp = 1;
- }
- if ( bSig0 < aSig0 ) goto aBigger;
- if ( aSig0 < bSig0 ) goto bBigger;
- if ( bSig1 < aSig1 ) goto aBigger;
- if ( aSig1 < bSig1 ) goto bBigger;
- return packFloat128(status->float_rounding_mode == float_round_down,
- 0, 0, 0);
- bExpBigger:
- if ( bExp == 0x7FFF ) {
- if (bSig0 | bSig1) {
- return propagateFloat128NaN(a, b, status);
- }
- return packFloat128( zSign ^ 1, 0x7FFF, 0, 0 );
- }
- if ( aExp == 0 ) {
- ++expDiff;
- }
- else {
- aSig0 |= UINT64_C(0x4000000000000000);
- }
- shift128RightJamming( aSig0, aSig1, - expDiff, &aSig0, &aSig1 );
- bSig0 |= UINT64_C(0x4000000000000000);
- bBigger:
- sub128( bSig0, bSig1, aSig0, aSig1, &zSig0, &zSig1 );
- zExp = bExp;
- zSign ^= 1;
- goto normalizeRoundAndPack;
- aExpBigger:
- if ( aExp == 0x7FFF ) {
- if (aSig0 | aSig1) {
- return propagateFloat128NaN(a, b, status);
- }
- return a;
- }
- if ( bExp == 0 ) {
- --expDiff;
- }
- else {
- bSig0 |= UINT64_C(0x4000000000000000);
- }
- shift128RightJamming( bSig0, bSig1, expDiff, &bSig0, &bSig1 );
- aSig0 |= UINT64_C(0x4000000000000000);
- aBigger:
- sub128( aSig0, aSig1, bSig0, bSig1, &zSig0, &zSig1 );
- zExp = aExp;
- normalizeRoundAndPack:
- --zExp;
- return normalizeRoundAndPackFloat128(zSign, zExp - 14, zSig0, zSig1,
- status);
-
-}
-
-/*----------------------------------------------------------------------------
-| Returns the result of adding the quadruple-precision floating-point values
-| `a' and `b'. The operation is performed according to the IEC/IEEE Standard
-| for Binary Floating-Point Arithmetic.
-*----------------------------------------------------------------------------*/
-
-float128 float128_add(float128 a, float128 b, float_status *status)
-{
- bool aSign, bSign;
-
- aSign = extractFloat128Sign( a );
- bSign = extractFloat128Sign( b );
- if ( aSign == bSign ) {
- return addFloat128Sigs(a, b, aSign, status);
- }
- else {
- return subFloat128Sigs(a, b, aSign, status);
- }
-
-}
-
-/*----------------------------------------------------------------------------
-| Returns the result of subtracting the quadruple-precision floating-point
-| values `a' and `b'. The operation is performed according to the IEC/IEEE
-| Standard for Binary Floating-Point Arithmetic.
-*----------------------------------------------------------------------------*/
-
-float128 float128_sub(float128 a, float128 b, float_status *status)
-{
- bool aSign, bSign;
-
- aSign = extractFloat128Sign( a );
- bSign = extractFloat128Sign( b );
- if ( aSign == bSign ) {
- return subFloat128Sigs(a, b, aSign, status);
- }
- else {
- return addFloat128Sigs(a, b, aSign, status);
- }
-
-}
-
-/*----------------------------------------------------------------------------
| Returns the result of multiplying the quadruple-precision floating-point
| values `a' and `b'. The operation is performed according to the IEC/IEEE
| Standard for Binary Floating-Point Arithmetic.
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-05 02:51:21 +0000