URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [coremark/] [fmod.c] - Blame information for rev 574

Go to most recent revision | Details | Compare with Previous | View Log


 
typedef unsigned int u_int32_t;
typedef signed int int32_t;
 
// Big endian struct...
typedef union {
        double value;
        struct {
                u_int32_t msw;
                u_int32_t lsw;
        } parts;
} ieee_double_shape_type;
 
/*
typedef union
{
  double value;
  struct
  {
    u_int32_t lsw;
    u_int32_t msw;
  } parts;
} ieee_double_shape_type;
 
*/
/* Get two 32 bit ints from a double.  */
 
#define EXTRACT_WORDS(ix0,ix1,d)                                \
do {                                                            \
  ieee_double_shape_type ew_u;                                  \
  ew_u.value = (d);                                             \
  (ix0) = ew_u.parts.msw;                                       \
  (ix1) = ew_u.parts.lsw;                                       \
} while (0)
 
/* Get the more significant 32 bit int from a double.  */
 
#define GET_HIGH_WORD(i,d)                                      \
do {                                                            \
  ieee_double_shape_type gh_u;                                  \
  gh_u.value = (d);                                             \
  (i) = gh_u.parts.msw;                                         \
} while (0)
 
/* Get the less significant 32 bit int from a double.  */
 
#define GET_LOW_WORD(i,d)                                       \
do {                                                            \
  ieee_double_shape_type gl_u;                                  \
  gl_u.value = (d);                                             \
  (i) = gl_u.parts.lsw;                                         \
} while (0)
 
/* Set a double from two 32 bit ints.  */
 
#define INSERT_WORDS(d,ix0,ix1)                                 \
do {                                                            \
  ieee_double_shape_type iw_u;                                  \
  iw_u.parts.msw = (ix0);                                       \
  iw_u.parts.lsw = (ix1);                                       \
  (d) = iw_u.value;                                             \
} while (0)
 
/* Set the more significant 32 bits of a double from an int.  */
 
#define SET_HIGH_WORD(d,v)                                      \
do {                                                            \
  ieee_double_shape_type sh_u;                                  \
  sh_u.value = (d);                                             \
  sh_u.parts.msw = (v);                                         \
  (d) = sh_u.value;                                             \
} while (0)
 
/* Set the less significant 32 bits of a double from an int.  */
 
#define SET_LOW_WORD(d,v)                                       \
do {                                                            \
  ieee_double_shape_type sl_u;                                  \
  sl_u.value = (d);                                             \
  sl_u.parts.lsw = (v);                                         \
  (d) = sl_u.value;                                             \
} while (0)
 
/* A union which permits us to convert between a float and a 32 bit
   int.  */
 
typedef union {
        float value;
        u_int32_t word;
} ieee_float_shape_type;
 
/* Get a 32 bit int from a float.  */
 
#define GET_FLOAT_WORD(i,d)                                     \
do {                                                            \
  ieee_float_shape_type gf_u;                                   \
  gf_u.value = (d);                                             \
  (i) = gf_u.word;                                              \
} while (0)
 
/* Set a float from a 32 bit int.  */
 
#define SET_FLOAT_WORD(d,i)                                     \
do {                                                            \
  ieee_float_shape_type sf_u;                                   \
  sf_u.word = (i);                                              \
  (d) = sf_u.value;                                             \
} while (0)
 
static const double one = 1.0;
 
double modf(double x, double *iptr)
{
        int32_t i0, i1, j0;
        u_int32_t i;
        EXTRACT_WORDS(i0, i1, x);
        j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;      /* exponent of x */
        if (j0 < 20) {          /* integer part in high x */
                if (j0 < 0) {    /* |x|<1 */
                        INSERT_WORDS(*iptr, i0 & 0x80000000, 0); /* *iptr = +-0 */
                        return x;
                } else {
                        i = (0x000fffff) >> j0;
                        if (((i0 & i) | i1) == 0) {      /* x is integral */
                                u_int32_t high;
                                *iptr = x;
                                GET_HIGH_WORD(high, x);
                                INSERT_WORDS(x, high & 0x80000000, 0);   /* return +-0 */
                                return x;
                        } else {
                                INSERT_WORDS(*iptr, i0 & (~i), 0);
                                return x - *iptr;
                        }
                }
        } else if (j0 > 51) {   /* no fraction part */
                u_int32_t high;
                *iptr = x * one;
                GET_HIGH_WORD(high, x);
                INSERT_WORDS(x, high & 0x80000000, 0);   /* return +-0 */
                return x;
        } else {                /* fraction part in low x */
                i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
                if ((i1 & i) == 0) {     /* x is integral */
                        u_int32_t high;
                        *iptr = x;
                        GET_HIGH_WORD(high, x);
                        INSERT_WORDS(x, high & 0x80000000, 0);   /* return +-0 */
                        return x;
                } else {
                        INSERT_WORDS(*iptr, i0, i1 & (~i));
                        return x - *iptr;
                }
        }
}

Line No.	Rev	Author	Line
1	355	julius
2			`typedef unsigned int u_int32_t;`
3			`typedef signed int int32_t;`
4
5			`// Big endian struct...`
6	406	julius	`typedef union {`
7			`double value;`
8			`struct {`
9			`u_int32_t msw;`
10			`u_int32_t lsw;`
11			`} parts;`
12	355	julius	`} ieee_double_shape_type;`
13
14			`/*`
15			`typedef union`
16			`{`
17			`double value;`
18			`struct`
19			`{`
20			`u_int32_t lsw;`
21			`u_int32_t msw;`
22			`} parts;`
23			`} ieee_double_shape_type;`
24
25			`*/`
26			`/* Get two 32 bit ints from a double. */`
27
28			`#define EXTRACT_WORDS(ix0,ix1,d) \`
29			`do { \`
30			`ieee_double_shape_type ew_u; \`
31			`ew_u.value = (d); \`
32			`(ix0) = ew_u.parts.msw; \`
33			`(ix1) = ew_u.parts.lsw; \`
34			`} while (0)`
35
36			`/* Get the more significant 32 bit int from a double. */`
37
38			`#define GET_HIGH_WORD(i,d) \`
39			`do { \`
40			`ieee_double_shape_type gh_u; \`
41			`gh_u.value = (d); \`
42			`(i) = gh_u.parts.msw; \`
43			`} while (0)`
44
45			`/* Get the less significant 32 bit int from a double. */`
46
47			`#define GET_LOW_WORD(i,d) \`
48			`do { \`
49			`ieee_double_shape_type gl_u; \`
50			`gl_u.value = (d); \`
51			`(i) = gl_u.parts.lsw; \`
52			`} while (0)`
53
54			`/* Set a double from two 32 bit ints. */`
55
56			`#define INSERT_WORDS(d,ix0,ix1) \`
57			`do { \`
58			`ieee_double_shape_type iw_u; \`
59			`iw_u.parts.msw = (ix0); \`
60			`iw_u.parts.lsw = (ix1); \`
61			`(d) = iw_u.value; \`
62			`} while (0)`
63
64			`/* Set the more significant 32 bits of a double from an int. */`
65
66			`#define SET_HIGH_WORD(d,v) \`
67			`do { \`
68			`ieee_double_shape_type sh_u; \`
69			`sh_u.value = (d); \`
70			`sh_u.parts.msw = (v); \`
71			`(d) = sh_u.value; \`
72			`} while (0)`
73
74			`/* Set the less significant 32 bits of a double from an int. */`
75
76			`#define SET_LOW_WORD(d,v) \`
77			`do { \`
78			`ieee_double_shape_type sl_u; \`
79			`sl_u.value = (d); \`
80			`sl_u.parts.lsw = (v); \`
81			`(d) = sl_u.value; \`
82			`} while (0)`
83
84			`/* A union which permits us to convert between a float and a 32 bit`
85			`int. */`
86
87	406	julius	`typedef union {`
88			`float value;`
89			`u_int32_t word;`
90	355	julius	`} ieee_float_shape_type;`
91
92			`/* Get a 32 bit int from a float. */`
93
94			`#define GET_FLOAT_WORD(i,d) \`
95			`do { \`
96			`ieee_float_shape_type gf_u; \`
97			`gf_u.value = (d); \`
98			`(i) = gf_u.word; \`
99			`} while (0)`
100
101			`/* Set a float from a 32 bit int. */`
102
103			`#define SET_FLOAT_WORD(d,i) \`
104			`do { \`
105			`ieee_float_shape_type sf_u; \`
106			`sf_u.word = (i); \`
107			`(d) = sf_u.value; \`
108			`} while (0)`
109
110			`static const double one = 1.0;`
111
112			`double modf(double x, double *iptr)`
113			`{`
114	406	julius	`int32_t i0, i1, j0;`
115	355	julius	`u_int32_t i;`
116	406	julius	`EXTRACT_WORDS(i0, i1, x);`
117			`j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; /* exponent of x */`
118			`if (j0 < 20) { /* integer part in high x */`
119			`if (j0 < 0) { /* \|x\|<1 */`
120			`INSERT_WORDS(iptr, i0 & 0x80000000, 0); / iptr = +-0 /`
121			`return x;`
122			`} else {`
123			`i = (0x000fffff) >> j0;`
124			`if (((i0 & i) \| i1) == 0) { /* x is integral */`
125			`u_int32_t high;`
126			`*iptr = x;`
127			`GET_HIGH_WORD(high, x);`
128			`INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */`
129			`return x;`
130			`} else {`
131			`INSERT_WORDS(*iptr, i0 & (~i), 0);`
132			`return x - *iptr;`
133			`}`
134			`}`
135			`} else if (j0 > 51) { /* no fraction part */`
136			`u_int32_t high;`
137			`iptr = x one;`
138			`GET_HIGH_WORD(high, x);`
139			`INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */`
140	355	julius	`return x;`
141	406	julius	`} else { /* fraction part in low x */`
142			`i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);`
143			`if ((i1 & i) == 0) { /* x is integral */`
144			`u_int32_t high;`
145			`*iptr = x;`
146			`GET_HIGH_WORD(high, x);`
147			`INSERT_WORDS(x, high & 0x80000000, 0); /* return +-0 */`
148			`return x;`
149	355	julius	`} else {`
150	406	julius	`INSERT_WORDS(*iptr, i0, i1 & (~i));`
151			`return x - *iptr;`
152	355	julius	`}`
153			`}`
154			`}`

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [coremark/] [fmod.c] - Blame information for rev 574