4 #ifdef STORAGE_WITH_MATH
7 #warning "You are building without math. math allows accurate calculations. It should be enabled."
12 #include "storage_number.h"
15 #if __x86_64__ || __ppc64__
22 storage_number pack_storage_number(calculated_number value, uint32_t flags)
24 // bit 32 = sign 0:positive, 1:negative
25 // bit 31 = 0:divide, 1:multiply
26 // bit 30, 29, 28 = (multiplier or divider) 0-6 (7 total)
27 // bit 27, 26, 25 flags
28 // bit 24 to bit 1 = the value
30 storage_number r = get_storage_number_flags(flags);
34 calculated_number n = value;
36 // if the value is negative
37 // add the sign bit and make it positive
39 r += (1 << 31); // the sign bit 32
43 // make its integer part fit in 0x00ffffff
44 // by dividing it by 10 up to 7 times
45 // and increasing the multiplier
46 while(m < 7 && n > (calculated_number)0x00ffffff) {
52 // the value was too big and we divided it
53 // so we add a multiplier to unpack it
54 r += (1 << 30) + (m << 27); // the multiplier m
56 if(n > (calculated_number)0x00ffffff) {
57 error("Number " CALCULATED_NUMBER_FORMAT " is too big.", value);
63 // 0x0019999e is the number that can be multiplied
64 // by 10 to give 0x00ffffff
65 // while the value is below 0x0019999e we can
66 // multiply it by 10, up to 7 times, increasing
68 while(m < 7 && n < (calculated_number)0x0019999e) {
73 // the value was small enough and we multiplied it
74 // so we add a divider to unpack it
75 r += (0 << 30) + (m << 27); // the divider m
78 #ifdef STORAGE_WITH_MATH
79 // without this there are rounding problems
80 // example: 0.9 becomes 0.89
83 r += (storage_number)n;
89 calculated_number unpack_storage_number(storage_number value)
93 int sign = 0, exp = 0;
95 value ^= get_storage_number_flags(value);
97 if(value & (1 << 31)) {
102 if(value & (1 << 30)) {
107 int mul = value >> 27;
110 calculated_number n = value;
112 // fprintf(stderr, "UNPACK: %08X, sign = %d, exp = %d, mul = %d, n = " CALCULATED_NUMBER_FORMAT "\n", value, sign, exp, mul, n);
125 // This trick seems to give an 80% speed increase in 32bit systems
126 // print_calculated_number_llu_r() will just print the digits up to the
127 // point the remaining value fits in 32 bits, and then calls
128 // print_calculated_number_lu_r() to print the rest with 32 bit arithmetic.
130 static char *print_calculated_number_lu_r(char *str, unsigned long uvalue) {
134 do *wstr++ = (char)(48 + (uvalue % 10)); while(uvalue /= 10);
138 static char *print_calculated_number_llu_r(char *str, unsigned long long uvalue) {
142 do *wstr++ = (char)(48 + (uvalue % 10)); while((uvalue /= 10) && uvalue > (unsigned long long)0xffffffff);
143 if(uvalue) return print_calculated_number_lu_r(wstr, uvalue);
148 int print_calculated_number(char *str, calculated_number value)
152 int sign = (value < 0) ? 1 : 0;
153 if(sign) value = -value;
155 #ifdef STORAGE_WITH_MATH
156 // without llrint() there are rounding problems
157 // for example 0.9 becomes 0.89
158 unsigned long long uvalue = llrint(value * (calculated_number)100000);
160 unsigned long long uvalue = value * (calculated_number)100000;
164 if(uvalue > (unsigned long long)0xffffffff)
165 wstr = print_calculated_number_llu_r(str, uvalue);
167 wstr = print_calculated_number_lu_r(str, uvalue);
169 do *wstr++ = (char)(48 + (uvalue % 10)); while(uvalue /= 10);
172 // make sure we have 6 bytes at least
173 while((wstr - str) < 6) *wstr++ = '0';
176 if(sign) *wstr++ = '-';
179 char *begin = str, *end = --wstr, aux;
180 while (end > begin) aux = *end, *end-- = *begin, *begin++ = aux;
182 // strreverse(str, wstr);
184 // remove trailing zeros
186 while(decimal > 0 && *wstr == '0') {
191 // terminate it, one position to the right
192 // to let space for a dot
195 // make space for the dot
197 for(i = 0; i < decimal ;i++) {
203 if(wstr[2] == '\0') { wstr[1] = '\0'; decimal--; }
206 // return the buffer length
207 return ( (wstr - str) + 2 + decimal );