[Bug c/39878] New: gcc 4.3.2 converts Decimal FP constants wrong

[tydeman at tybor dot com]

/* DFP TR 24732 == WG14 / N1312 */
#define __STDC_WANT_DEC_FP__ /* Tell implementation that we want Decimal FP */

#include <stdio.h>

int main(void){
  /*
   * If DEC_EVAL_METHOD is 0, then these triples are not the same.
   * If DEC_EVAL_METHOD is 1 or 2, then these suffer double rounding
   * and are the same.
   */
  _Decimal32 f1 = 9999998.499999999999999999999999999999999999DF;
  _Decimal32 f2 = 9999998.5DF;
  _Decimal32 f3 = 9999998.500000000000000000000000000000000001DF;

  _Decimal32 f4 = 9999999.499999999999999999999999999999999999DF;
  _Decimal32 f5 = 9999999.5DF;
  _Decimal32 f6 = 9999999.500000000000000000000000000000000001DF;

  _Decimal128 ld1 = .6666666666666666666666666666666666666666DF;

  if( .6666667DF == ld1 ){
    (void)printf("DEC_EVAL_METHOD appears to be 0\n");
  }else if( .6666666666666667DD == ld1 ){
    (void)printf("DEC_EVAL_METHOD appears to be 1\n");
  }else if( .6666666666666666666666666666666667DL == ld1 ){
    (void)printf("DEC_EVAL_METHOD appears to be 2\n");
  }else{
    (void)printf("DEC_EVAL_METHOD appears to be -1\n");
  }

  if( (f1==f2) && (f2==f3) ){
    (void)printf("Fail 1 if DEC_EVAL_METHOD is 0\n");
  }

  if( (f4==f5) && (f5==f6) ){
    (void)printf("Fail 2 if DEC_EVAL_METHOD is 0\n");
  }
  return 0;
}


-- 
           Summary: gcc 4.3.2 converts Decimal FP constants wrong
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tydeman at tybor dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39878