v22, C (gcc) - rextester

v22

Language: Layout:

//gcc 7.4.0

#include  <stdio.h>
#include  <limits.h>
#include  <stdbool.h>
#include "stdint.h"
#define OUT_TXT_SIZE_FLOATING  14

///round floating point by (0,2-8) characters
#define ROUND_FLOAT    8

union double_raw
{
    struct
    {
        uint64_t massa  :52;
        uint64_t order  :11;
        uint64_t sign   :1;
    };
    uint32_t    u_raw[2];
    uint64_t    u64_raw;
    double      d_raw;
};

const int16_t data_otner[133] = {
-327,-322,-317,-313,-308,-303,-298,-293,-289,-284,-279,-274,-269,-264,-260,-255,-250,-245,-240,-236,
-231,-226,-221,-216,-211,-207,-202,-197,-192,-187,-183,-178,-173,-168,-163,-158,-154,-149,-144,-139,
-134,-130,-125,-120,-115,-110,-105,-101,-96,-91,-86,-81,-77,-72,-67,-62,-57,-53,-48,-43,
-38,-33,-28,-24,-19,-14,-9,-4,0,5,10,15,20,25,29,34,39,44,49,53,
58,63,68,73,78,82,87,92,97,102,106,111,116,121,126,131,135,140,145,150,
155,159,164,169,174,179,183,188,193,198,203,208,212,217,222,227,232,236,241,246,
251,256,261,265,270,275,280,285,289,294,299,304,309,};

const uint32_t data_of10raw[133] = {
1206214955,790505035,518065379,3395193265,2225073860,1458224404,955661947,626302614,4104536801,2689949240,
1762885134,1155324400,757153401,496208051,3251949089,2131197354,1396701497,915342294,599878726,3931365217,
2576459509,1688508503,1106580933,725208881,475272893,3114748422,2041281526,1337774260,876723741,574569670,
3765499791,2467757943,1617269845,1059893965,694612109,455220993,2983336292,1955159273,1281333182,839734514,
550328410,3606632274,2363642526,1549036766,1015176736,665306226,436015089,2857468478,1872670543,1227273367,
804305874,527109899,3454467423,2263919770,1483682460,972346138,637236766,4176194860,2736911063,1793662035,
1175494352,770371977,504870979,3308722450,2168404344,1421085472,931322574,610351562,4000000000,2621440000,
1717986920,1125899908,737869764,483570327,3169126500,2076918744,1361129469,892029808,584600655,3831238852,
2510840695,1645504557,1078397867,706738825,463168357,3035420146,1989292946,1303703026,854394816,559936185,
3669597787,2404907604,1576080248,1032899952,676921314,443627153,2907354899,1905364106,1248699421,818347653,
536312317,3514776402,2303443863,1509584969,989321605,648361809,4249103944,2784692759,1824976248,1196016434,
783821329,513685148,3366486977,2206260907,1445895147,947581844,621007236,4069833027,2667205774,1747979977,
1145556157,750751684,492012623,3224453926,2113178124,1384892417,907603094,594806765,3898125605,2554675596,
1674232198,1097224813,719077255,};

const char reserve_char[10] = { '0',0,'i','n','f',0,'N','a','N',0,};

char* massa_char (char* tail_txt, uint32_t value) // 76
{
    uint32_t res, tmmp;
    uint32_t cn = 0;
    *tail_txt = cn;
    tmmp = 3294967296UL;
    cn += (((uint64_t) tmmp + value) >> 32) + (9 - ROUND_FLOAT);
    do{
        tmmp = ((uint64_t) value * 3435973837UL >> 32);
        res = value + '0';
        value = tmmp >> 3;
        tmmp = value + (value << 2);
        res -= tmmp << 1;
        if (cn != 0)
        {
            tmmp = '5' - res;
            res = '0';
            if (--cn == 0) value -= (int32_t) tmmp >> 31;
        };
        *(--tail_txt) = res;
    }while (value > 0);
    return tail_txt;
};

char* u32_char (char* tail_txt, uint32_t value)//40
{
    *tail_txt = 0;
    uint32_t res, tmp;
    do{
        tmp = ((uint64_t) value * 3435973837UL >> 32);
        res = value + '0';
        value = tmp >> 3;
        res -= value * 10;
        *(--tail_txt) = res;
    }while (value > 0);
    return tail_txt;
};

char * i32_char(char* tail_txt, int32_t value)//22
{
    int32_t mi = value >> 31;
    if (mi) value = 0 - value;
    tail_txt = u32_char(tail_txt, value);
    *(tail_txt - 1) = '-';
    tail_txt += mi;
    return tail_txt;
};

char* floating_char(char* txt, uint32_t massa, int32_t feeze)//208
{

uint32_t of10raw, cis;
    int32_t order10;
    cis = (uint32_t) feeze >> 4;
    feeze &= 0x0FUL;
    if (feeze > 8) {feeze -= 16;cis += 1;};
    order10 = data_otner[cis];
    of10raw = data_of10raw[cis];

if (feeze > 0)
    {
        do{
            if ((of10raw >> 31 ) !=0)
            {
                order10++;
                of10raw = ((uint64_t) of10raw * 3435973837UL >> 34);
            }else of10raw <<= 1;
        }while (--feeze);
    }else if (feeze < 0)
    {
        do{
            if (of10raw < 858993459UL)
            {
                order10--;
                of10raw *= 5;
            }else of10raw >>= 1;
        }while (++feeze);
    };
    massa = ((uint64_t) massa * of10raw >> 32);
    char *mas_s, *mas_f, *ord_s, *ord_f;
    int32_t tmp, tff;
    mas_f = txt + 13;
    mas_s = massa_char (mas_f, massa);
    tmp = mas_f - mas_s; tmp -= 10;
    order10 += tmp;
    *(mas_s - 1) = *mas_s; *mas_s = '.';
    if ( *txt == '-')
    {
        mas_s -= 2; *mas_s = '-';
    }else mas_s -= 1;
    if (order10 != 0)
    {
        ord_f = txt + 19;
        ord_s = i32_char(ord_f, order10);
        *(--ord_s) = 'e'; tff = ord_f - ord_s;
    }else tff = 0;
    tmp = mas_f - mas_s + tff;
    if (tmp > OUT_TXT_SIZE_FLOATING)
    {
         mas_f = mas_s + OUT_TXT_SIZE_FLOATING - tff;
    }else ;
    do{tmp = *(--mas_f);} while (tmp == '0');
    if (tmp != '.') mas_f += 1;
    *mas_f = 0;
    if (tff != 0 ) do{ tmp = *(ord_s++); *(mas_f++) = tmp; }while(tmp);
    return mas_s;
};

char* double_char(char* text, double value )//140
{
    union double_raw    dtemp;
    dtemp.d_raw = value;
    uint32_t feeze, cis;

feeze = (int32_t)dtemp.u_raw[1]>> 31;
    cis = 45 & feeze;
    *text = cis;
    dtemp.sign = 0;
    if (dtemp.u64_raw != 0x0000000000000000ULL) // no goto l_zero;
    {
        dtemp.sign = 1;
        if (dtemp.u64_raw < 0xFFF0000000000000ULL)
        {
            feeze = (uint32_t) dtemp.order;
            if (feeze != 0)
            {
                feeze += 64;
                dtemp.u64_raw <<= 11;
                dtemp.u_raw[1] |= 1 << 31;
            }else
            {
                dtemp.sign = 0;
                if (dtemp.u_raw[1] == 0)
                {
                    cis = __builtin_clz((int32_t)dtemp.u_raw[0]);
                    dtemp.u_raw[1] = dtemp.u_raw[0] << cis;
                    feeze = 44 - cis;
                }else
                {
                    cis = __builtin_clz((int32_t)dtemp.u_raw[1]);
                    dtemp.u_raw[1] = dtemp.u_raw[1] << cis;
                    feeze = 76 - cis;
                    cis = 32 - cis;
                    dtemp.u_raw[1] |= dtemp.u_raw[0] >> cis;
                };
            };
            text = floating_char(text ,dtemp.u_raw[1], feeze );
            return text;
        }else if (dtemp.u64_raw > 0xFFF0000000000000ULL) dtemp.u_raw[0] = 6;// l_NaN;
        else dtemp.u_raw[0] = 2;
    };
    char *tex; char une;
    tex = text - feeze;
    do{ une = reserve_char[dtemp.u_raw[0]++]; *tex++ = une;}while(une);
    return text;
};

void print_double(double value)
{
    char print_buf_d[20];
    printf("%s",double_char(&print_buf_d[0], value));
};

int main(void) { 
    double ddff = 1.0;
    
    for(int i = 0; i < 560; i++) {
        print_double(ddff);printf(" \t");printf("%e",ddff ); printf("\n");
        ddff /= 10.0;
    }
    printf("\n");
    
    return 0;
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Время компиляции: 0,12 сек, абсолютное время работы: 0,15 сек, процессорное время: 0,01 сек, пиковый объем памяти: 6 Мб, абсолютное время обслуживания: 0,4 сек

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