https://community.intel.com/t5/Intel-Fortran-Compiler/does-intel-fortran-compiler-9-1-support-triple-precision/m-p/791046#M32656 real*16 on Pentium and Xeon families takes advantage of x87 extended precision, but uses software arithmetic functions to implement 113-bit precision. Thus, it is significantly more accurate and slower than 64-bit x87 precision would be.<BR />real*16 on Itanium uses combinations of hardware instructions including those which implement 64-bit extended precision, so it is not so costly as on Xeon, but 113-bit precision still takes longer than 64-bit would do.<BR /> Thu, 06 Jul 2006 07:44:12 GMT TimP 2006-07-06T07:44:12Z https://community.intel.com/t5/Intel-Fortran-Compiler/does-intel-fortran-compiler-9-1-support-triple-precision/m-p/791045#M32655 <P>Is the data type of extended-precision real "REAL*16"implemented as the triple precision in the Intel fortran compiler?</P> <P></P> <P>Thanks.</P> Thu, 06 Jul 2006 07:16:53 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/does-intel-fortran-compiler-9-1-support-triple-precision/m-p/791045#M32655 vtuneuser 2006-07-06T07:16:53Z https://community.intel.com/t5/Intel-Fortran-Compiler/does-intel-fortran-compiler-9-1-support-triple-precision/m-p/791046#M32656 real*16 on Pentium and Xeon families takes advantage of x87 extended precision, but uses software arithmetic functions to implement 113-bit precision. Thus, it is significantly more accurate and slower than 64-bit x87 precision would be.<BR />real*16 on Itanium uses combinations of hardware instructions including those which implement 64-bit extended precision, so it is not so costly as on Xeon, but 113-bit precision still takes longer than 64-bit would do.<BR /> Thu, 06 Jul 2006 07:44:12 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/does-intel-fortran-compiler-9-1-support-triple-precision/m-p/791046#M32656 TimP 2006-07-06T07:44:12Z