https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745598#M3698 Great!, Thanks!!<BR /> Mon, 19 Nov 2007 19:10:52 GMT jvoo 2007-11-19T19:10:52Z https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745595#M3695 Is it possible to call subroutines/functions written in x86 assembly from Fortran? There seems to be plenty of info on how to do this with C++ but I haven't been able to find much for Fortran. Thanks.<BR /> Mon, 19 Nov 2007 06:17:43 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745595#M3695 jvoo 2007-11-19T06:17:43Z https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745596#M3696 You could use ISO C binding if you want to make your assembly function with a C interface. Then you can use mixed C, C++, and inline asm. Maybe you consider it cheating, but the obvious way for assembly source is to write a Fortran skeleton for your function, compile with -S, fill it in, and compile again with Fortran compiler.<BR /> Mon, 19 Nov 2007 13:59:00 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745596#M3696 TimP 2007-11-19T13:59:00Z https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745597#M3697 It's really the same as calling from C. Just make sure the routine name has the proper case and underscore decoration, and understand that character lengths are passed at the end of the argument list.<BR /> Mon, 19 Nov 2007 17:32:11 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745597#M3697 Steven_L_Intel1 2007-11-19T17:32:11Z https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745598#M3698 Great!, Thanks!!<BR /> Mon, 19 Nov 2007 19:10:52 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/IFORT-and-Assembly/m-p/745598#M3698 jvoo 2007-11-19T19:10:52Z