diff options
Diffstat (limited to 'fpu/softfloat.c')
| -rw-r--r-- | fpu/softfloat.c | 49 |
1 files changed, 38 insertions, 11 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 5e9746c..b7dcf4d 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -5697,10 +5697,13 @@ floatx80 floatx80_div(floatx80 a, floatx80 b, float_status *status) /*---------------------------------------------------------------------------- | Returns the remainder of the extended double-precision floating-point value | `a' with respect to the corresponding value `b'. The operation is performed -| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. +| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic, +| if 'mod' is false; if 'mod' is true, return the remainder based on truncating +| the quotient toward zero instead. *----------------------------------------------------------------------------*/ -floatx80 floatx80_rem(floatx80 a, floatx80 b, float_status *status) +floatx80 floatx80_modrem(floatx80 a, floatx80 b, bool mod, + float_status *status) { bool aSign, zSign; int32_t aExp, bExp, expDiff; @@ -5746,7 +5749,7 @@ floatx80 floatx80_rem(floatx80 a, floatx80 b, float_status *status) expDiff = aExp - bExp; aSig1 = 0; if ( expDiff < 0 ) { - if ( expDiff < -1 ) return a; + if ( mod || expDiff < -1 ) return a; shift128Right( aSig0, 0, 1, &aSig0, &aSig1 ); expDiff = 0; } @@ -5778,14 +5781,16 @@ floatx80 floatx80_rem(floatx80 a, floatx80 b, float_status *status) term1 = 0; term0 = bSig; } - sub128( term0, term1, aSig0, aSig1, &alternateASig0, &alternateASig1 ); - if ( lt128( alternateASig0, alternateASig1, aSig0, aSig1 ) - || ( eq128( alternateASig0, alternateASig1, aSig0, aSig1 ) - && ( q & 1 ) ) - ) { - aSig0 = alternateASig0; - aSig1 = alternateASig1; - zSign = ! zSign; + if (!mod) { + sub128( term0, term1, aSig0, aSig1, &alternateASig0, &alternateASig1 ); + if ( lt128( alternateASig0, alternateASig1, aSig0, aSig1 ) + || ( eq128( alternateASig0, alternateASig1, aSig0, aSig1 ) + && ( q & 1 ) ) + ) { + aSig0 = alternateASig0; + aSig1 = alternateASig1; + zSign = ! zSign; + } } return normalizeRoundAndPackFloatx80( @@ -5794,6 +5799,28 @@ floatx80 floatx80_rem(floatx80 a, floatx80 b, float_status *status) } /*---------------------------------------------------------------------------- +| Returns the remainder of the extended double-precision floating-point value +| `a' with respect to the corresponding value `b'. The operation is performed +| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. +*----------------------------------------------------------------------------*/ + +floatx80 floatx80_rem(floatx80 a, floatx80 b, float_status *status) +{ + return floatx80_modrem(a, b, false, status); +} + +/*---------------------------------------------------------------------------- +| Returns the remainder of the extended double-precision floating-point value +| `a' with respect to the corresponding value `b', with the quotient truncated +| toward zero. +*----------------------------------------------------------------------------*/ + +floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status) +{ + return floatx80_modrem(a, b, true, status); +} + +/*---------------------------------------------------------------------------- | Returns the square root of the extended double-precision floating-point | value `a'. The operation is performed according to the IEC/IEEE Standard | for Binary Floating-Point Arithmetic. |