| //uspace/trunk/softfloat/include/arithmetic.h |
|---|
| File deleted |
| //uspace/trunk/softfloat/include/sub.h |
|---|
| 0,0 → 1,35 |
| /* |
| * 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. |
| */ |
| #ifndef __SUB_H__ |
| #define __SUB_H__ |
| float32 subFloat32(float32 a, float32 b); |
| #endif |
| //uspace/trunk/softfloat/include/sftypes.h |
|---|
| 80,6 → 80,9 |
| #define FLOAT32_MANTISA_SIZE 23 |
| #define FLOAT64_MANTISA_SIZE 52 |
| #define FLOAT32_HIDDEN_BIT_MASK 0x800000 |
| #define FLOAT64_HIDDEN_BIT_MASK 0x10000000000000l |
| #define FLOAT32_BIAS 0x7F |
| #define FLOAT64_BIAS 0x3FF |
| #define FLOAT80_BIAS 0x3FFF |
| //uspace/trunk/softfloat/include/mul.h |
|---|
| 0,0 → 1,35 |
| /* |
| * 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. |
| */ |
| #ifndef __MUL_H__ |
| #define __MUL_H__ |
| float32 mulFloat32(float32 a, float32 b); |
| #endif |
| //uspace/trunk/softfloat/include/div.h |
|---|
| 0,0 → 1,35 |
| /* |
| * 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. |
| */ |
| #ifndef __DIV_H__ |
| #define __DIV_H__ |
| float32 divFloat32(float32 a, float32 b); |
| #endif |
| //uspace/trunk/softfloat/include/add.h |
|---|
| 0,0 → 1,37 |
| /* |
| * 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. |
| */ |
| #ifndef __ADD_H__ |
| #define __ADD_H__ |
| float32 addFloat32(float32 a, float32 b); |
| float64 addFloat64(float64 a, float64 b); |
| #endif |
| //uspace/trunk/softfloat/generic/arithmetic.c |
|---|
| File deleted |
| //uspace/trunk/softfloat/generic/softfloat.c |
|---|
| 28,7 → 28,12 |
| #include<softfloat.h> |
| #include<sftypes.h> |
| #include<arithmetic.h> |
| #include<add.h> |
| #include<sub.h> |
| #include<mul.h> |
| #include<div.h> |
| #include<conversion.h> |
| #include<comparison.h> |
| #include<other.h> |
| 76,7 → 81,7 |
| float32 fa, fb; |
| fa.f=a; |
| fb.f=b; |
| // return divFloat32(fa, fb).f; |
| //return divFloat32(fa, fb).f; |
| } |
| float __negsf2(float a) |
| //uspace/trunk/softfloat/generic/div.c |
|---|
| 0,0 → 1,38 |
| /* |
| * 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<add.h> |
| #include<comparison.h> |
| float32 divFloat32(float32 a, float32 b) |
| { |
| /* TODO: */ |
| } |
| //uspace/trunk/softfloat/generic/add.c |
|---|
| 0,0 → 1,229 |
| /* |
| * 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<add.h> |
| #include<comparison.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 & FLOAT32_HIDDEN_BIT_MASK ) { |
| /* result is not denormalized */ |
| a.parts.exp = 1; |
| }; |
| a.parts.mantisa = mant1; |
| return a; |
| }; |
| mant1 |= FLOAT32_HIDDEN_BIT_MASK; //add hidden bit |
| if (exp2 == 0) { |
| /* second operand is denormalized */ |
| --expdiff; |
| } else { |
| /* add hidden bit to second operand */ |
| mant2 |= FLOAT32_HIDDEN_BIT_MASK; |
| }; |
| /* create some space for rounding */ |
| mant1 <<= 6; |
| mant2 <<= 6; |
| if (expdiff > 24) { |
| goto done; |
| }; |
| mant2>>=expdiff; |
| mant1+=mant2; |
| done: |
| if (mant1 & (FLOAT32_HIDDEN_BIT_MASK << 6) ) { |
| ++exp1; |
| mant1 >>= 1; |
| }; |
| /* rounding - if first bit after mantisa is set then round up */ |
| mant1 += (0x1 << 5); |
| if (mant1 & (FLOAT32_HIDDEN_BIT_MASK << 6)) { |
| ++exp1; |
| mant1 >> =1; |
| }; |
| a.parts.exp = exp1; |
| /*Clear hidden bit and shift */ |
| a.parts.mantisa = ((mant1>>6) & (~FLOAT32_HIDDEN_BIT_MASK)) ; |
| return a; |
| } |
| /** Add two Float64 numbers with same signs |
| */ |
| float64 addFloat64(float64 a, float64 b) |
| { |
| int expdiff; |
| __u64 exp1,exp2,mant1,mant2; |
| expdiff=a.parts.exp - b.parts.exp; |
| if (expdiff<0) { |
| if (isFloat64NaN(b)) { |
| //TODO: fix SigNaN |
| if (isFloat64SigNaN(b)) { |
| }; |
| return b; |
| }; |
| /* b is infinity and a not */ |
| if (b.parts.exp==0x8FF) { |
| return b; |
| } |
| mant1=b.parts.mantisa; |
| exp1=b.parts.exp; |
| mant2=a.parts.mantisa; |
| exp2=a.parts.exp; |
| expdiff*=-1; |
| } else { |
| if (isFloat64NaN(a)) { |
| //TODO: fix SigNaN |
| if ((isFloat64SigNaN(a))||(isFloat64SigNaN(b))) { |
| }; |
| return a; |
| }; |
| /* a is infinity and b not */ |
| if (a.parts.exp == 0x8FF) { |
| 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 & FLOAT64_HIDDEN_BIT_MASK) { |
| /* result is not denormalized */ |
| a.parts.exp = 1; |
| }; |
| a.parts.mantisa = mant1; |
| return a; |
| }; |
| /* add hidden bit - mant1 is sure not denormalized */ |
| mant1 |= FLOAT64_HIDDEN_BIT_MASK; |
| /* second operand ... */ |
| if (exp2 == 0) { |
| /* ... is denormalized */ |
| --expdiff; |
| } else { |
| /* is not denormalized */ |
| mant2 |= FLOAT64_HIDDEN_BIT_MASK; |
| }; |
| /* create some space for rounding */ |
| mant1 <<= 6; |
| mant2 <<= 6; |
| if (expdiff > 53) { |
| goto done; |
| }; |
| mant2 >>= expdiff; |
| mant1 += mant2; |
| done: |
| if (mant1 & (FLOAT64_HIDDEN_BIT_MASK << 6) ) { |
| ++exp1; |
| mant1 >>= 1; |
| }; |
| /* rounding - if first bit after mantisa is set then round up */ |
| mant1 += (0x1 << 5); |
| if (mant1 & (FLOAT64_HIDDEN_BIT_MASK << 6)) { |
| ++exp1; |
| mant1 >> =1; |
| }; |
| a.parts.exp = exp1; |
| /*Clear hidden bit and shift */ |
| a.parts.mantisa = ( (mant1 >>6 ) & (~ (FLOAT64_HIDDEN_BIT_MASK))); |
| return a; |
| } |
| //uspace/trunk/softfloat/generic/sub.c |
|---|
| 0,0 → 1,139 |
| /* |
| * 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 "sub.h" |
| /** Subtract two float32 numbers with same signs |
| */ |
| float32 subFloat32(float32 a, float32 b) |
| { |
| int expdiff; |
| __u32 exp1,exp2,mant1,mant2; |
| float32 result; |
| result.f = 0; |
| expdiff=a.parts.exp - b.parts.exp; |
| if ((expdiff<0)||((expdiff==0)&&(a.parts.mantisa<b.parts.mantisa))) { |
| if (isFloat32NaN(b)) { |
| //TODO: fix SigNaN |
| if (isFloat32SigNaN(b)) { |
| }; |
| return b; |
| }; |
| if (b.parts.exp==0xFF) { |
| b.parts.sign=!b.parts.sign; /* num -(+-inf) = -+inf */ |
| return b; |
| } |
| result.parts.sign = !a.parts.sign; |
| 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) { |
| if (b.parts.exp==0xFF) { |
| /* inf - inf => nan */ |
| //TODO: fix exception |
| result.binary = FLOAT32_NAN; |
| return result; |
| }; |
| return a; |
| } |
| result.parts.sign = a.parts.sign; |
| mant1=a.parts.mantisa; |
| exp1=a.parts.exp; |
| mant2=b.parts.mantisa; |
| exp2=b.parts.exp; |
| }; |
| if (exp1==0) { |
| //both are denormalized |
| result.parts.mantisa=mant1-mant2; |
| if (result.parts.mantisa>mant1) { |
| //TODO: underflow exception |
| return result; |
| }; |
| result.parts.exp=0; |
| return result; |
| }; |
| // 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; |
| }; |
| mant1 = mant1-(mant2>>expdiff); |
| done: |
| //TODO: find first nonzero digit and shift result and detect possibly underflow |
| while ((exp1>0)&&(!(mant1&0x20000000))) { |
| exp1--; |
| mant1 <<= 1; |
| /* TODO: fix underflow - mant1 == 0 does not necessary means underflow... */ |
| }; |
| //rounding - if first bit after mantisa is set then round up |
| mant1 += 0x20; |
| if (mant1&0x40000000) { |
| ++exp1; |
| mant1>>=1; |
| }; |
| result.parts.mantisa = ((mant1&(~0x20000000))>>6); /*Clear hidden bit and shift */ |
| result.parts.exp = exp1; |
| return result; |
| }; |
| //uspace/trunk/softfloat/generic/mul.c |
|---|
| 0,0 → 1,172 |
| /* |
| * 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<mul.h> |
| #include<comparison.h> |
| /** Multiply two 32 bit float numbers |
| * |
| */ |
| float32 mulFloat32(float32 a, float32 b) |
| { |
| float32 result; |
| __u64 mant1, mant2; |
| __s32 exp; |
| result.parts.sign = a.parts.sign ^ b.parts.sign; |
| if ((isFloat32NaN(a))||(isFloat32NaN(b))) { |
| /* TODO: fix SigNaNs */ |
| if (isFloat32SigNaN(a)) { |
| result.parts.mantisa = a.parts.mantisa; |
| result.parts.exp = a.parts.exp; |
| return result; |
| }; |
| if (isFloat32SigNaN(b)) { /* TODO: fix SigNaN */ |
| result.parts.mantisa = b.parts.mantisa; |
| result.parts.exp = b.parts.exp; |
| return result; |
| }; |
| /* set NaN as result */ |
| result.parts.mantisa = 0x1; |
| result.parts.exp = 0xFF; |
| return result; |
| }; |
| if (isFloat32Infinity(a)) { |
| if (isFloat32Zero(b)) { |
| /* FIXME: zero * infinity */ |
| result.parts.mantisa = 0x1; |
| result.parts.exp = 0xFF; |
| return result; |
| } |
| result.parts.mantisa = a.parts.mantisa; |
| result.parts.exp = a.parts.exp; |
| return result; |
| } |
| if (isFloat32Infinity(b)) { |
| if (isFloat32Zero(a)) { |
| /* FIXME: zero * infinity */ |
| result.parts.mantisa = 0x1; |
| result.parts.exp = 0xFF; |
| return result; |
| } |
| result.parts.mantisa = b.parts.mantisa; |
| result.parts.exp = b.parts.exp; |
| return result; |
| } |
| /* exp is signed so we can easy detect underflow */ |
| exp = a.parts.exp + b.parts.exp; |
| exp -= FLOAT32_BIAS; |
| if (exp >= 0xFF ) { |
| /* FIXME: overflow */ |
| /* set infinity as result */ |
| result.parts.mantisa = 0x0; |
| result.parts.exp = 0xFF; |
| return result; |
| }; |
| if (exp < 0) { |
| /* FIXME: underflow */ |
| /* return signed zero */ |
| result.parts.mantisa = 0x0; |
| result.parts.exp = 0x0; |
| return result; |
| }; |
| mant1 = a.parts.mantisa; |
| if (a.parts.exp>0) { |
| mant1 |= 0x800000; |
| } else { |
| ++exp; |
| }; |
| mant2 = b.parts.mantisa; |
| if (b.parts.exp>0) { |
| mant2 |= 0x800000; |
| } else { |
| ++exp; |
| }; |
| mant1 <<= 1; /* one bit space for rounding */ |
| mant1 = mant1 * mant2; |
| /* round and return */ |
| while ((exp < 0xFF )&&(mant1 > 0x1FFFFFF )) { |
| /* 0xFFFFFF is 23 bits of mantisa + one more for hidden bit (all shifted 1 bit left)*/ |
| ++exp; |
| mant1 >>= 1; |
| }; |
| /* rounding */ |
| //++mant1; /* FIXME: not works - without it is ok */ |
| mant1 >>= 1; /* shift off rounding space */ |
| if ((exp < 0xFF )&&(mant1 > 0xFFFFFF )) { |
| ++exp; |
| mant1 >>= 1; |
| }; |
| if (exp >= 0xFF ) { |
| /* TODO: fix overflow */ |
| /* return infinity*/ |
| result.parts.exp = 0xFF; |
| result.parts.mantisa = 0x0; |
| return result; |
| } |
| exp -= FLOAT32_MANTISA_SIZE; |
| if (exp <= FLOAT32_MANTISA_SIZE) { |
| /* denormalized number */ |
| mant1 >>= 1; /* denormalize */ |
| while ((mant1 > 0) && (exp < 0)) { |
| mant1 >>= 1; |
| ++exp; |
| }; |
| if (mant1 == 0) { |
| /* FIXME : underflow */ |
| result.parts.exp = 0; |
| result.parts.mantisa = 0; |
| return result; |
| }; |
| }; |
| result.parts.exp = exp; |
| result.parts.mantisa = mant1 & 0x7FFFFF; |
| return result; |
| } |