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author | aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-02-05 13:42:47 +0000 |
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committer | aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-02-05 13:42:47 +0000 |
commit | 374dfc33e260c9836e32ae7a0a90d951f3989aff (patch) | |
tree | 107dc13ee13233640f312fc21652c059df9fe190 /fpu | |
parent | 7344da06e8277f6b06e6df38dc20789c49c42164 (diff) | |
download | qemu-374dfc33e260c9836e32ae7a0a90d951f3989aff.zip qemu-374dfc33e260c9836e32ae7a0a90d951f3989aff.tar.gz qemu-374dfc33e260c9836e32ae7a0a90d951f3989aff.tar.bz2 |
soft-float: add float32_log2() and float64_log2()
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6518 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'fpu')
-rw-r--r-- | fpu/softfloat.c | 93 | ||||
-rw-r--r-- | fpu/softfloat.h | 2 |
2 files changed, 95 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 3d5169d..4d58744 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -2057,6 +2057,53 @@ float32 float32_sqrt( float32 a STATUS_PARAM ) } /*---------------------------------------------------------------------------- +| Returns the binary log of the single-precision floating-point value `a'. +| The operation is performed according to the IEC/IEEE Standard for Binary +| Floating-Point Arithmetic. +*----------------------------------------------------------------------------*/ +float32 float32_log2( float32 a STATUS_PARAM ) +{ + flag aSign, zSign; + int16 aExp; + bits32 aSig, zSig, i; + + aSig = extractFloat32Frac( a ); + aExp = extractFloat32Exp( a ); + aSign = extractFloat32Sign( a ); + + if ( aExp == 0 ) { + if ( aSig == 0 ) return packFloat32( 1, 0xFF, 0 ); + normalizeFloat32Subnormal( aSig, &aExp, &aSig ); + } + if ( aSign ) { + float_raise( float_flag_invalid STATUS_VAR); + return float32_default_nan; + } + if ( aExp == 0xFF ) { + if ( aSig ) return propagateFloat32NaN( a, float32_zero STATUS_VAR ); + return a; + } + + aExp -= 0x7F; + aSig |= 0x00800000; + zSign = aExp < 0; + zSig = aExp << 23; + + for (i = 1 << 22; i > 0; i >>= 1) { + aSig = ( (bits64)aSig * aSig ) >> 23; + if ( aSig & 0x01000000 ) { + aSig >>= 1; + zSig |= i; + } + } + + if ( zSign ) + zSig = -zSig; + + return normalizeRoundAndPackFloat32( zSign, 0x85, zSig STATUS_VAR ); +} + +/*---------------------------------------------------------------------------- | Returns 1 if the single-precision floating-point value `a' is equal to | the corresponding value `b', and 0 otherwise. The comparison is performed | according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. @@ -3006,6 +3053,52 @@ float64 float64_sqrt( float64 a STATUS_PARAM ) } /*---------------------------------------------------------------------------- +| Returns the binary log of the double-precision floating-point value `a'. +| The operation is performed according to the IEC/IEEE Standard for Binary +| Floating-Point Arithmetic. +*----------------------------------------------------------------------------*/ +float64 float64_log2( float64 a STATUS_PARAM ) +{ + flag aSign, zSign; + int16 aExp; + bits64 aSig, aSig0, aSig1, zSig, i; + + aSig = extractFloat64Frac( a ); + aExp = extractFloat64Exp( a ); + aSign = extractFloat64Sign( a ); + + if ( aExp == 0 ) { + if ( aSig == 0 ) return packFloat64( 1, 0x7FF, 0 ); + normalizeFloat64Subnormal( aSig, &aExp, &aSig ); + } + if ( aSign ) { + float_raise( float_flag_invalid STATUS_VAR); + return float64_default_nan; + } + if ( aExp == 0x7FF ) { + if ( aSig ) return propagateFloat64NaN( a, float64_zero STATUS_VAR ); + return a; + } + + aExp -= 0x3FF; + aSig |= LIT64( 0x0010000000000000 ); + zSign = aExp < 0; + zSig = (bits64)aExp << 52; + for (i = 1LL << 51; i > 0; i >>= 1) { + mul64To128( aSig, aSig, &aSig0, &aSig1 ); + aSig = ( aSig0 << 12 ) | ( aSig1 >> 52 ); + if ( aSig & LIT64( 0x0020000000000000 ) ) { + aSig >>= 1; + zSig |= i; + } + } + + if ( zSign ) + zSig = -zSig; + return normalizeRoundAndPackFloat64( zSign, 0x408, zSig STATUS_VAR ); +} + +/*---------------------------------------------------------------------------- | Returns 1 if the double-precision floating-point value `a' is equal to the | corresponding value `b', and 0 otherwise. The comparison is performed | according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. diff --git a/fpu/softfloat.h b/fpu/softfloat.h index a06a313..a0353da 100644 --- a/fpu/softfloat.h +++ b/fpu/softfloat.h @@ -269,6 +269,7 @@ float32 float32_mul( float32, float32 STATUS_PARAM ); float32 float32_div( float32, float32 STATUS_PARAM ); float32 float32_rem( float32, float32 STATUS_PARAM ); float32 float32_sqrt( float32 STATUS_PARAM ); +float32 float32_log2( float32 STATUS_PARAM ); int float32_eq( float32, float32 STATUS_PARAM ); int float32_le( float32, float32 STATUS_PARAM ); int float32_lt( float32, float32 STATUS_PARAM ); @@ -339,6 +340,7 @@ float64 float64_mul( float64, float64 STATUS_PARAM ); float64 float64_div( float64, float64 STATUS_PARAM ); float64 float64_rem( float64, float64 STATUS_PARAM ); float64 float64_sqrt( float64 STATUS_PARAM ); +float64 float64_log2( float64 STATUS_PARAM ); int float64_eq( float64, float64 STATUS_PARAM ); int float64_le( float64, float64 STATUS_PARAM ); int float64_lt( float64, float64 STATUS_PARAM ); |