0,0 → 1,125 |
/* |
* Copyright (C) 2005 Josef Cejka |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#include<sftypes.h> |
#include<arithmetic.h> |
|
/** Add two Float32 numbers with same signs |
*/ |
float32 addFloat32(float32 a, float32 b) |
{ |
int expdiff; |
__u32 exp1,exp2,mant1,mant2; |
|
expdiff=a.parts.exp - b.parts.exp; |
if (expdiff<0) { |
if (isFloat32NaN(b)) { |
//TODO: fix SigNaN |
if (isFloat32SigNaN(b)) { |
}; |
return b; |
}; |
|
if (b.parts.exp==0xFF) { |
return b; |
} |
|
mant1=b.parts.mantisa; |
exp1=b.parts.exp; |
mant2=a.parts.mantisa; |
exp2=a.parts.exp; |
expdiff*=-1; |
} else { |
if (isFloat32NaN(a)) { |
//TODO: fix SigNaN |
if ((isFloat32SigNaN(a))||(isFloat32SigNaN(b))) { |
}; |
return a; |
}; |
|
if (a.parts.exp==0xFF) { |
return a; |
} |
|
mant1=a.parts.mantisa; |
exp1=a.parts.exp; |
mant2=b.parts.mantisa; |
exp2=b.parts.exp; |
}; |
|
if (exp1==0) { |
//both are denormalized |
mant1+=mant2; |
if (mant1&0xF00000) { |
a.parts.exp=1; |
}; |
a.parts.mantisa=mant1; |
return a; |
}; |
|
// create some space for rounding |
mant1<<=6; |
mant2<<=6; |
|
mant1|=0x20000000; //add hidden bit |
|
|
if (exp2==0) { |
--expdiff; |
} else { |
mant2|=0x20000000; //hidden bit |
}; |
|
if (expdiff>24) { |
goto done; |
}; |
|
mant2>>=expdiff; |
mant1+=mant2; |
done: |
if (mant1&0x40000000) { |
++exp1; |
mant1>>=1; |
}; |
|
//rounding - if first bit after mantisa is set then round up |
mant1+=0x20; |
|
a.parts.exp=exp1; |
a.parts.mantisa=mant1>>6; |
return a; |
}; |
|
/** Substract two float32 numbers with same signs |
*/ |
float32 subFloat32(float32 a, float32 b) |
{ |
|
|
}; |
|