O

object files

compile only, 3.4.7 –c

name, 3.4.66 –o filename

object library search directories, 3.4.48 –Lpath

object-oriented Fortran, 4.6.13 Object-Oriented Fortran Support

obsolete command-line options, 3.3.4 Obsolete Option Flags

octal, 4.2.1.2 Alternate Forms of Boolean Constants

OMP_NUM_THREADS, number of threads

3.4.4 –autopar

3.4.145 –xopenmp[={parallel|noopt|none}]

one-trip DO loops, 3.4.67 –onetrip

OpenMP, 2.3.2.1 OpenMP Parallelization Directives

directives summary, C.3 Fortran OpenMP Directives

OPT directive, 2.3.1.5 The OPT Directive

-xmaxopt option, 3.4.138 –xmaxopt[=n]

optimization

across source files, 3.4.124 –xipo[={0|1|2}]

aliasing, 3.4.102 –xalias[=keywords]

floating-point, 3.4.34 –fsimple[={1|2|0}]

inline user-written routines, 3.4.43 –inline=[%auto][[,][no%]f1,…[no%]fn]

interprocedural, 3.4.124 –xipo[={0|1|2}]

levels, 3.4.65 –O[n]

link-time, 3.4.136 –xlinkopt[={1|2|0}]

loop unrolling, 3.4.91 –unroll=n

loop unrolling by directive, 2.3.1.3 The UNROLL Directive

math library, 3.4.134 –xlibmopt

OPT directive

2.3.1.5 The OPT Directive

3.4.138 –xmaxopt[=n]

PIPELOOP directive, 2.3.1.6 The PIPELOOP[=n] Directive

PREFETCH directive, 2.3.1.7 The PREFETCH Directives

specify cache, 3.4.108 –xcache=c

specify instruction set architecture, 3.4.104 –xarch=isa

specify processor, 3.4.110 –xchip=c

target hardware, 3.4.57 –native

with debugging, 3.4.38 –g

with -fast, 3.4.23 –fast

options, See command-line options

order of, functions, 3.4.115 –xF

order of processing, options, 3.2 Options Syntax

overflow

stack, 3.4.83 –stackvar

trap on floating-point, 3.4.36 –ftrap=t

overindexing, aliasing, 3.4.102 –xalias[=keywords]