WebSVN – HelenOS-historic – Diff – /uspace/trunk/softfloat/generic/add.c


/*
 * 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;
    uint32_t exp1, exp2,frac1, frac2;
   
    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 == FLOAT32_MAX_EXPONENT) {
            return b;
        }
       
        frac1 = b.parts.fraction;
        exp1 = b.parts.exp;
        frac2 = a.parts.fraction;
        exp2 = a.parts.exp;
        expdiff *= -1;
    } else {
        if ((isFloat32NaN(a)) || (isFloat32NaN(b))) {
            /* TODO: fix SigNaN */
            if (isFloat32SigNaN(a) || isFloat32SigNaN(b)) {
            };
            return (isFloat32NaN(a)?a:b);
        };
       
        if (a.parts.exp == FLOAT32_MAX_EXPONENT) {
            return a;
        }
       
        frac1 = a.parts.fraction;
        exp1 = a.parts.exp;
        frac2 = b.parts.fraction;
        exp2 = b.parts.exp;
    };
   
    if (exp1 == 0) {
        /* both are denormalized */
        frac1 += frac2;
        if (frac1 & FLOAT32_HIDDEN_BIT_MASK ) {
            /* result is not denormalized */
            a.parts.exp = 1;
        };
        a.parts.fraction = frac1;
        return a;
    };
   
    frac1 |= FLOAT32_HIDDEN_BIT_MASK; /* add hidden bit */
 
    if (exp2 == 0) {
        /* second operand is denormalized */
        --expdiff;
    } else {
        /* add hidden bit to second operand */
        frac2 |= FLOAT32_HIDDEN_BIT_MASK;
    };
   
    /* create some space for rounding */
    frac1 <<= 6;
    frac2 <<= 6;
   
    if (expdiff < (FLOAT32_FRACTION_SIZE + 2) ) {
        frac2 >>= expdiff;
        frac1 += frac2;
    } else {
        a.parts.exp = exp1;
        a.parts.fraction = (frac1 >> 6) & (~(FLOAT32_HIDDEN_BIT_MASK));
        return a;
    }
   
    if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7) ) {
        ++exp1;
        frac1 >>= 1;
    };
   
    /* rounding - if first bit after fraction is set then round up */
    frac1 += (0x1 << 5);
   
    if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7)) {
        /* rounding overflow */
        ++exp1;
        frac1 >>= 1;
    };
   
   
    if ((exp1 == FLOAT32_MAX_EXPONENT ) || (exp2 > exp1)) {
            /* overflow - set infinity as result */
            a.parts.exp = FLOAT32_MAX_EXPONENT;
            a.parts.fraction = 0;
            return a;
            }
   
    a.parts.exp = exp1;
   
    /*Clear hidden bit and shift */
    a.parts.fraction = ((frac1 >> 6) & (~FLOAT32_HIDDEN_BIT_MASK)) ;
    return a;
}
 
 
/** Add two Float64 numbers with same signs
 */
float64 addFloat64(float64 a, float64 b)
{
    int expdiff;
    uint32_t exp1, exp2;
    uint64_t frac1, frac2;
   
    expdiff = ((int )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 == FLOAT64_MAX_EXPONENT ) {
            return b;
        }
       
        frac1 = b.parts.fraction;
        exp1 = b.parts.exp;
        frac2 = a.parts.fraction;
        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 == FLOAT64_MAX_EXPONENT ) {
            return a;
        }
       
        frac1 = a.parts.fraction;
        exp1 = a.parts.exp;
        frac2 = b.parts.fraction;
        exp2 = b.parts.exp;
    };
   
    if (exp1 == 0) {
        /* both are denormalized */
        frac1 += frac2;
        if (frac1 & FLOAT64_HIDDEN_BIT_MASK) {
            /* result is not denormalized */
            a.parts.exp = 1;
        };
        a.parts.fraction = frac1;
        return a;
    };
   
    /* add hidden bit - frac1 is sure not denormalized */
    frac1 |= FLOAT64_HIDDEN_BIT_MASK;
 
    /* second operand ... */
    if (exp2 == 0) {
        /* ... is denormalized */
        --expdiff; 
    } else {
        /* is not denormalized */
        frac2 |= FLOAT64_HIDDEN_BIT_MASK;
    };
   
    /* create some space for rounding */
    frac1 <<= 6;
    frac2 <<= 6;
   
    if (expdiff < (FLOAT64_FRACTION_SIZE + 2) ) {
        frac2 >>= expdiff;
        frac1 += frac2;
    } else {
        a.parts.exp = exp1;
        a.parts.fraction = (frac1 >> 6) & (~(FLOAT64_HIDDEN_BIT_MASK));
        return a;
    }
   
    if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7) ) {
        ++exp1;
        frac1 >>= 1;
    };
   
    /* rounding - if first bit after fraction is set then round up */
    frac1 += (0x1 << 5);
   
    if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7)) {
        /* rounding overflow */
        ++exp1;
        frac1 >>= 1;
    };
   
    if ((exp1 == FLOAT64_MAX_EXPONENT ) || (exp2 > exp1)) {
            /* overflow - set infinity as result */
            a.parts.exp = FLOAT64_MAX_EXPONENT;
            a.parts.fraction = 0;
            return a;
            }
   
    a.parts.exp = exp1;
    /*Clear hidden bit and shift */
    a.parts.fraction = ( (frac1 >> 6 ) & (~FLOAT64_HIDDEN_BIT_MASK));
   
    return a;
}
 
 
 

Rev 834	Rev 1031
1	/*	1	/*
2	* Copyright (C) 2005 Josef Cejka	2	* Copyright (C) 2005 Josef Cejka
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include<sftypes.h>	29	#include<sftypes.h>
30	#include<add.h>	30	#include<add.h>
31	#include<comparison.h>	31	#include<comparison.h>
32		32
33	/** Add two Float32 numbers with same signs	33	/** Add two Float32 numbers with same signs
34	*/	34	*/
35	float32 addFloat32(float32 a, float32 b)	35	float32 addFloat32(float32 a, float32 b)
36	{	36	{
37	int expdiff;	37	int expdiff;
38	__u32 exp1, exp2,frac1, frac2;	38	uint32_t exp1, exp2,frac1, frac2;
39		39
40	expdiff = a.parts.exp - b.parts.exp;	40	expdiff = a.parts.exp - b.parts.exp;
41	if (expdiff < 0) {	41	if (expdiff < 0) {
42	if (isFloat32NaN(b)) {	42	if (isFloat32NaN(b)) {
43	/* TODO: fix SigNaN */	43	/* TODO: fix SigNaN */
44	if (isFloat32SigNaN(b)) {	44	if (isFloat32SigNaN(b)) {
45	};	45	};
46		46
47	return b;	47	return b;
48	};	48	};
49		49
50	if (b.parts.exp == FLOAT32_MAX_EXPONENT) {	50	if (b.parts.exp == FLOAT32_MAX_EXPONENT) {
51	return b;	51	return b;
52	}	52	}
53		53
54	frac1 = b.parts.fraction;	54	frac1 = b.parts.fraction;
55	exp1 = b.parts.exp;	55	exp1 = b.parts.exp;
56	frac2 = a.parts.fraction;	56	frac2 = a.parts.fraction;
57	exp2 = a.parts.exp;	57	exp2 = a.parts.exp;
58	expdiff *= -1;	58	expdiff *= -1;
59	} else {	59	} else {
60	if ((isFloat32NaN(a)) \|\| (isFloat32NaN(b))) {	60	if ((isFloat32NaN(a)) \|\| (isFloat32NaN(b))) {
61	/* TODO: fix SigNaN */	61	/* TODO: fix SigNaN */
62	if (isFloat32SigNaN(a) \|\| isFloat32SigNaN(b)) {	62	if (isFloat32SigNaN(a) \|\| isFloat32SigNaN(b)) {
63	};	63	};
64	return (isFloat32NaN(a)?a:b);	64	return (isFloat32NaN(a)?a:b);
65	};	65	};
66		66
67	if (a.parts.exp == FLOAT32_MAX_EXPONENT) {	67	if (a.parts.exp == FLOAT32_MAX_EXPONENT) {
68	return a;	68	return a;
69	}	69	}
70		70
71	frac1 = a.parts.fraction;	71	frac1 = a.parts.fraction;
72	exp1 = a.parts.exp;	72	exp1 = a.parts.exp;
73	frac2 = b.parts.fraction;	73	frac2 = b.parts.fraction;
74	exp2 = b.parts.exp;	74	exp2 = b.parts.exp;
75	};	75	};
76		76
77	if (exp1 == 0) {	77	if (exp1 == 0) {
78	/* both are denormalized */	78	/* both are denormalized */
79	frac1 += frac2;	79	frac1 += frac2;
80	if (frac1 & FLOAT32_HIDDEN_BIT_MASK ) {	80	if (frac1 & FLOAT32_HIDDEN_BIT_MASK ) {
81	/* result is not denormalized */	81	/* result is not denormalized */
82	a.parts.exp = 1;	82	a.parts.exp = 1;
83	};	83	};
84	a.parts.fraction = frac1;	84	a.parts.fraction = frac1;
85	return a;	85	return a;
86	};	86	};
87		87
88	frac1 \|= FLOAT32_HIDDEN_BIT_MASK; /* add hidden bit */	88	frac1 \|= FLOAT32_HIDDEN_BIT_MASK; /* add hidden bit */
89		89
90	if (exp2 == 0) {	90	if (exp2 == 0) {
91	/* second operand is denormalized */	91	/* second operand is denormalized */
92	--expdiff;	92	--expdiff;
93	} else {	93	} else {
94	/* add hidden bit to second operand */	94	/* add hidden bit to second operand */
95	frac2 \|= FLOAT32_HIDDEN_BIT_MASK;	95	frac2 \|= FLOAT32_HIDDEN_BIT_MASK;
96	};	96	};
97		97
98	/* create some space for rounding */	98	/* create some space for rounding */
99	frac1 <<= 6;	99	frac1 <<= 6;
100	frac2 <<= 6;	100	frac2 <<= 6;
101		101
102	if (expdiff < (FLOAT32_FRACTION_SIZE + 2) ) {	102	if (expdiff < (FLOAT32_FRACTION_SIZE + 2) ) {
103	frac2 >>= expdiff;	103	frac2 >>= expdiff;
104	frac1 += frac2;	104	frac1 += frac2;
105	} else {	105	} else {
106	a.parts.exp = exp1;	106	a.parts.exp = exp1;
107	a.parts.fraction = (frac1 >> 6) & (~(FLOAT32_HIDDEN_BIT_MASK));	107	a.parts.fraction = (frac1 >> 6) & (~(FLOAT32_HIDDEN_BIT_MASK));
108	return a;	108	return a;
109	}	109	}
110		110
111	if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7) ) {	111	if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7) ) {
112	++exp1;	112	++exp1;
113	frac1 >>= 1;	113	frac1 >>= 1;
114	};	114	};
115		115
116	/* rounding - if first bit after fraction is set then round up */	116	/* rounding - if first bit after fraction is set then round up */
117	frac1 += (0x1 << 5);	117	frac1 += (0x1 << 5);
118		118
119	if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7)) {	119	if (frac1 & (FLOAT32_HIDDEN_BIT_MASK << 7)) {
120	/* rounding overflow */	120	/* rounding overflow */
121	++exp1;	121	++exp1;
122	frac1 >>= 1;	122	frac1 >>= 1;
123	};	123	};
124		124
125		125
126	if ((exp1 == FLOAT32_MAX_EXPONENT ) \|\| (exp2 > exp1)) {	126	if ((exp1 == FLOAT32_MAX_EXPONENT ) \|\| (exp2 > exp1)) {
127	/* overflow - set infinity as result */	127	/* overflow - set infinity as result */
128	a.parts.exp = FLOAT32_MAX_EXPONENT;	128	a.parts.exp = FLOAT32_MAX_EXPONENT;
129	a.parts.fraction = 0;	129	a.parts.fraction = 0;
130	return a;	130	return a;
131	}	131	}
132		132
133	a.parts.exp = exp1;	133	a.parts.exp = exp1;
134		134
135	/Clear hidden bit and shift /	135	/Clear hidden bit and shift /
136	a.parts.fraction = ((frac1 >> 6) & (~FLOAT32_HIDDEN_BIT_MASK)) ;	136	a.parts.fraction = ((frac1 >> 6) & (~FLOAT32_HIDDEN_BIT_MASK)) ;
137	return a;	137	return a;
138	}	138	}
139		139
140		140
141	/** Add two Float64 numbers with same signs	141	/** Add two Float64 numbers with same signs
142	*/	142	*/
143	float64 addFloat64(float64 a, float64 b)	143	float64 addFloat64(float64 a, float64 b)
144	{	144	{
145	int expdiff;	145	int expdiff;
146	__u32 exp1, exp2;	146	uint32_t exp1, exp2;
147	__u64 frac1, frac2;	147	uint64_t frac1, frac2;
148		148
149	expdiff = ((int )a.parts.exp) - b.parts.exp;	149	expdiff = ((int )a.parts.exp) - b.parts.exp;
150	if (expdiff < 0) {	150	if (expdiff < 0) {
151	if (isFloat64NaN(b)) {	151	if (isFloat64NaN(b)) {
152	/* TODO: fix SigNaN */	152	/* TODO: fix SigNaN */
153	if (isFloat64SigNaN(b)) {	153	if (isFloat64SigNaN(b)) {
154	};	154	};
155		155
156	return b;	156	return b;
157	};	157	};
158		158
159	/* b is infinity and a not */	159	/* b is infinity and a not */
160	if (b.parts.exp == FLOAT64_MAX_EXPONENT ) {	160	if (b.parts.exp == FLOAT64_MAX_EXPONENT ) {
161	return b;	161	return b;
162	}	162	}
163		163
164	frac1 = b.parts.fraction;	164	frac1 = b.parts.fraction;
165	exp1 = b.parts.exp;	165	exp1 = b.parts.exp;
166	frac2 = a.parts.fraction;	166	frac2 = a.parts.fraction;
167	exp2 = a.parts.exp;	167	exp2 = a.parts.exp;
168	expdiff *= -1;	168	expdiff *= -1;
169	} else {	169	} else {
170	if (isFloat64NaN(a)) {	170	if (isFloat64NaN(a)) {
171	/* TODO: fix SigNaN */	171	/* TODO: fix SigNaN */
172	if (isFloat64SigNaN(a) \|\| isFloat64SigNaN(b)) {	172	if (isFloat64SigNaN(a) \|\| isFloat64SigNaN(b)) {
173	};	173	};
174	return a;	174	return a;
175	};	175	};
176		176
177	/* a is infinity and b not */	177	/* a is infinity and b not */
178	if (a.parts.exp == FLOAT64_MAX_EXPONENT ) {	178	if (a.parts.exp == FLOAT64_MAX_EXPONENT ) {
179	return a;	179	return a;
180	}	180	}
181		181
182	frac1 = a.parts.fraction;	182	frac1 = a.parts.fraction;
183	exp1 = a.parts.exp;	183	exp1 = a.parts.exp;
184	frac2 = b.parts.fraction;	184	frac2 = b.parts.fraction;
185	exp2 = b.parts.exp;	185	exp2 = b.parts.exp;
186	};	186	};
187		187
188	if (exp1 == 0) {	188	if (exp1 == 0) {
189	/* both are denormalized */	189	/* both are denormalized */
190	frac1 += frac2;	190	frac1 += frac2;
191	if (frac1 & FLOAT64_HIDDEN_BIT_MASK) {	191	if (frac1 & FLOAT64_HIDDEN_BIT_MASK) {
192	/* result is not denormalized */	192	/* result is not denormalized */
193	a.parts.exp = 1;	193	a.parts.exp = 1;
194	};	194	};
195	a.parts.fraction = frac1;	195	a.parts.fraction = frac1;
196	return a;	196	return a;
197	};	197	};
198		198
199	/* add hidden bit - frac1 is sure not denormalized */	199	/* add hidden bit - frac1 is sure not denormalized */
200	frac1 \|= FLOAT64_HIDDEN_BIT_MASK;	200	frac1 \|= FLOAT64_HIDDEN_BIT_MASK;
201		201
202	/* second operand ... */	202	/* second operand ... */
203	if (exp2 == 0) {	203	if (exp2 == 0) {
204	/* ... is denormalized */	204	/* ... is denormalized */
205	--expdiff;	205	--expdiff;
206	} else {	206	} else {
207	/* is not denormalized */	207	/* is not denormalized */
208	frac2 \|= FLOAT64_HIDDEN_BIT_MASK;	208	frac2 \|= FLOAT64_HIDDEN_BIT_MASK;
209	};	209	};
210		210
211	/* create some space for rounding */	211	/* create some space for rounding */
212	frac1 <<= 6;	212	frac1 <<= 6;
213	frac2 <<= 6;	213	frac2 <<= 6;
214		214
215	if (expdiff < (FLOAT64_FRACTION_SIZE + 2) ) {	215	if (expdiff < (FLOAT64_FRACTION_SIZE + 2) ) {
216	frac2 >>= expdiff;	216	frac2 >>= expdiff;
217	frac1 += frac2;	217	frac1 += frac2;
218	} else {	218	} else {
219	a.parts.exp = exp1;	219	a.parts.exp = exp1;
220	a.parts.fraction = (frac1 >> 6) & (~(FLOAT64_HIDDEN_BIT_MASK));	220	a.parts.fraction = (frac1 >> 6) & (~(FLOAT64_HIDDEN_BIT_MASK));
221	return a;	221	return a;
222	}	222	}
223		223
224	if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7) ) {	224	if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7) ) {
225	++exp1;	225	++exp1;
226	frac1 >>= 1;	226	frac1 >>= 1;
227	};	227	};
228		228
229	/* rounding - if first bit after fraction is set then round up */	229	/* rounding - if first bit after fraction is set then round up */
230	frac1 += (0x1 << 5);	230	frac1 += (0x1 << 5);
231		231
232	if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7)) {	232	if (frac1 & (FLOAT64_HIDDEN_BIT_MASK << 7)) {
233	/* rounding overflow */	233	/* rounding overflow */
234	++exp1;	234	++exp1;
235	frac1 >>= 1;	235	frac1 >>= 1;
236	};	236	};
237		237
238	if ((exp1 == FLOAT64_MAX_EXPONENT ) \|\| (exp2 > exp1)) {	238	if ((exp1 == FLOAT64_MAX_EXPONENT ) \|\| (exp2 > exp1)) {
239	/* overflow - set infinity as result */	239	/* overflow - set infinity as result */
240	a.parts.exp = FLOAT64_MAX_EXPONENT;	240	a.parts.exp = FLOAT64_MAX_EXPONENT;
241	a.parts.fraction = 0;	241	a.parts.fraction = 0;
242	return a;	242	return a;
243	}	243	}
244		244
245	a.parts.exp = exp1;	245	a.parts.exp = exp1;
246	/Clear hidden bit and shift /	246	/Clear hidden bit and shift /
247	a.parts.fraction = ( (frac1 >> 6 ) & (~FLOAT64_HIDDEN_BIT_MASK));	247	a.parts.fraction = ( (frac1 >> 6 ) & (~FLOAT64_HIDDEN_BIT_MASK));
248		248
249	return a;	249	return a;
250	}	250	}
251		251
252		252
253		253

Subversion Repositories HelenOS-historic

(root)/uspace/trunk/softfloat/generic/add.c – Rev 834 → 1031