diff options
| -rw-r--r-- | fpu/softfloat.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 3988bd1099..e66a5d46c8 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -5479,8 +5479,14 @@ float32 float32_scalbn( float32 a, int n STATUS_PARAM ) if ( aExp == 0xFF ) { return a; } - aExp += n; - return roundAndPackFloat32( aSign, aExp, aSig STATUS_VAR ); + if ( aExp != 0 ) + aSig |= 0x00800000; + else if ( aSig == 0 ) + return a; + + aExp += n - 1; + aSig <<= 7; + return normalizeRoundAndPackFloat32( aSign, aExp, aSig STATUS_VAR ); } float64 float64_scalbn( float64 a, int n STATUS_PARAM ) @@ -5496,8 +5502,14 @@ float64 float64_scalbn( float64 a, int n STATUS_PARAM ) if ( aExp == 0x7FF ) { return a; } - aExp += n; - return roundAndPackFloat64( aSign, aExp, aSig STATUS_VAR ); + if ( aExp != 0 ) + aSig |= LIT64( 0x0010000000000000 ); + else if ( aSig == 0 ) + return a; + + aExp += n - 1; + aSig <<= 10; + return normalizeRoundAndPackFloat64( aSign, aExp, aSig STATUS_VAR ); } #ifdef FLOATX80 @@ -5514,9 +5526,12 @@ floatx80 floatx80_scalbn( floatx80 a, int n STATUS_PARAM ) if ( aExp == 0x7FF ) { return a; } + if (aExp == 0 && aSig == 0) + return a; + aExp += n; - return roundAndPackFloatx80( STATUS(floatx80_rounding_precision), - aSign, aExp, aSig, 0 STATUS_VAR ); + return normalizeRoundAndPackFloatx80( STATUS(floatx80_rounding_precision), + aSign, aExp, aSig, 0 STATUS_VAR ); } #endif @@ -5534,8 +5549,14 @@ float128 float128_scalbn( float128 a, int n STATUS_PARAM ) if ( aExp == 0x7FFF ) { return a; } - aExp += n; - return roundAndPackFloat128( aSign, aExp, aSig0, aSig1, 0 STATUS_VAR ); + if ( aExp != 0 ) + aSig0 |= LIT64( 0x0001000000000000 ); + else if ( aSig0 == 0 && aSig1 == 0 ) + return a; + + aExp += n - 1; + return normalizeRoundAndPackFloat128( aSign, aExp, aSig0, aSig1 + STATUS_VAR ); } #endif |