Lut.cc File Reference

#include "L1Trigger/DTTraco/interface/Lut.h"

Go to the source code of this file.

Functions
void	DSPtoIEEE32 (short DSPmantissa, short DSPexp, float *f)
char	exaDigit (int i)
void	IEEE32toDSP (float f, short *DSPmantissa, short *DSPexp)
std::string	lutFmt (int i)

Function Documentation

void DSPtoIEEE32	(	short	DSPmantissa,
		short	DSPexp,
		float *	f
	)

Definition at line 401 of file Lut.cc.

References funct::pow().

                                                            {
  DSPexp -= 15;
  *f = DSPmantissa * (float)pow(2.0, DSPexp);

  return;
}

char exaDigit

(

int

i

)

Definition at line 147 of file Lut.cc.

Referenced by lutFmt().

                     {
  if (i < 10)
    return (i + '0');
  else
    return ((i - 10) + 'A');
}

void IEEE32toDSP	(	float	f,
		short *	DSPmantissa,
		short *	DSPexp
	)

Definition at line 408 of file Lut.cc.

References validate-o2o-wbm::f, mps_fire::i, and jetcorrextractor::sign().

                                                             {
  // long *pl, lm;
  uint32_t pl;
  uint32_t lm;

  // 101104 SV convert float to int in safe way
  union {
    float f;
    uint32_t i;
  } u;
  u.f = f;
  pl = u.i;

  bool sign = false;
  if (f == 0.0) {
    *DSPexp = 0;
    *DSPmantissa = 0;
  } else {
    // pl = reinterpret_cast<uint32_t*> (&f);
    // pl = (long*) (&f);
    if ((pl & 0x80000000) != 0)
      sign = true;
    lm = (0x800000 | (pl & 0x7FFFFF));  // [1][23bit mantissa]
    lm >>= 9;                           // reduce to 15bits
    lm &= 0x7FFF;
    *DSPexp = ((pl >> 23) & 0xFF) - 126;
    *DSPmantissa = (short)lm;
    if (sign)
      *DSPmantissa = -*DSPmantissa;  // convert negative value in 2.s
    // complement
  }
  return;
}

std::string lutFmt

(

int

i

)

Definition at line 154 of file Lut.cc.

References visDQMUpload::buf, exaDigit(), alignCSCRings::s, and AlCaHLTBitMon_QueryRunRegistry::string.

                        {
  char *buf = new char[6];
  buf[2] = ' ';
  buf[5] = '\0';
  int j4 = i % 16;
  i /= 16;
  int j3 = i % 16;
  i /= 16;
  int j2 = i % 16;
  i /= 16;
  int j1 = i % 16;
  buf[0] = exaDigit(j1);
  buf[1] = exaDigit(j2);
  buf[3] = exaDigit(j3);
  buf[4] = exaDigit(j4);
  std::string s(buf);
  return s;
}