s_approxRecip32_1.c File Reference

#include <stdint.h>
#include "platform.h"

Include dependency graph for s_approxRecip32_1.c:

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Functions
uint32_t	softfloat_approxRecip32_1 (uint32_t a)

Variables
const uint16_t	softfloat_approxRecip_1k0s [16]
const uint16_t	softfloat_approxRecip_1k1s [16]

Function Documentation

softfloat_approxRecip32_1()

uint32_t softfloat_approxRecip32_1

(

uint32_t

a

)

Definition at line 45 of file s_approxRecip32_1.c.

{
    int index;
    uint16_t eps, r0;
    uint32_t sigma0;
    uint_fast32_t r;
    uint32_t sqrSigma0;
 
    index = a>>27 & 0xF;
    eps = (uint16_t) (a>>11);
    r0 = softfloat_approxRecip_1k0s[index]
             - ((softfloat_approxRecip_1k1s[index] * (uint_fast32_t) eps)>>20);
    sigma0 = ~(uint_fast32_t) ((r0 * (uint_fast64_t) a)>>7);
    r = ((uint_fast32_t) r0<<16) + ((r0 * (uint_fast64_t) sigma0)>>24);
    sqrSigma0 = ((uint_fast64_t) sigma0 * sigma0)>>32;
    r += ((uint32_t) r * (uint_fast64_t) sqrSigma0)>>48;
    return r;
 
}

Variable Documentation

softfloat_approxRecip_1k0s

const uint16_t softfloat_approxRecip_1k0s[16]

extern

Definition at line 41 of file s_approxRecip_1Ks.c.

                                                {
    0xFFC4, 0xF0BE, 0xE363, 0xD76F, 0xCCAD, 0xC2F0, 0xBA16, 0xB201,
    0xAA97, 0xA3C6, 0x9D7A, 0x97A6, 0x923C, 0x8D32, 0x887E, 0x8417
};

softfloat_approxRecip_1k1s

const uint16_t softfloat_approxRecip_1k1s[16]

extern

Definition at line 45 of file s_approxRecip_1Ks.c.

                                                {
    0xF0F1, 0xD62C, 0xBFA1, 0xAC77, 0x9C0A, 0x8DDB, 0x8185, 0x76BA,
    0x6D3B, 0x64D4, 0x5D5C, 0x56B1, 0x50B6, 0x4B55, 0x4679, 0x4211
};