This flag disclosure applies to the Intel 5.0 Compilers with support for Itanium(R) processor based systems running 64-bit Windows OS. Description of compiler flags for Intel C Compiler 5.0 ------------------------------------------------------ /O1 optimize for speed, but disable some optimizations which increase code size for a small speed benefit. Includes inline expansion except for intrinsic functions, global optimizations, string pooling optimizations. /O2 Optimizes for speed. The -O2 option includes O1 optimizations and in addition enables inlining of intrinsics and more speed optimizations. /O3: Builds on -01 and -02 optimizations by enabling high-level optimization. This level does not guarantee higher performance. This may result in longer compilation times. /Qip enable single-file IP optimizations (within files, same as /Ob2) /Qipo multi-file ip optimizations that includes: - inline function expansion - interprocedural constant propogation - dead code elimination - propagation of function characteristics - passing arguments in registers - loop-invariant code motion /Qprof_gen instrument program for profiling for the first phase of two-phase profile guided otimization /Qprof_use Instructs the compiler to produce a profile-optimized executable and merges available dynamic information (.dyn) files into a pgopti.dpi file. If you perform multiple executions of the instrumented program, -Qprof_use merges the dynamic information files again and overwrites the previous pgopti.dpi file. Without any other options, the current directory is searched for .dyn files /GX Enables the full C++ Exception Handling unwind semantics. /GR Enables C++ Runtime Type Information (RTTI). Description of compiler flags for Intel FORTRAN Compiler 5.0 ------------------------------------------------------------ /O1: optimize for speed, but disable some optimizations which increase code size for a small speed benefit. Includes inline expansion except for intrinsic functions, global optimizations, string pooling optimizations. /O2: Optimizes for speed. The -O2 option includes O1 optimizations and in addition enables inlining of intrinsics and more speed optimizations. /O3: Builds on -01 and -02 optimizations by enabling high-level optimization. This level does not guarantee higher performance. This may result in longer compilation times. /Qftz: Enable flush-to-zero mode, where gradual underflows are flushed to zero. /Qip: enable single-file IP optimizations (within files, same as /Ob2) /Qipo: multi-file ip optimizations that includes: - inline function expansion - interprocedural constant propogation - dead code elimination - propagation of function characteristics - passing arguments in registers - loop-invariant code motion /Qprof_gen: instrument program for profiling for the first phase of two-phase profile guided otimization /Qprof_use: Instructs the compiler to produce a profile-optimized executable and merges available dynamic information (.dyn) files into a pgopti.dpi file. If you perform multiple executions of the instrumented program, -Qprof_use merges the dynamic information files again and overwrites the previous pgopti.dpi file. Without any other options, the current directory is searched for .dyn files Other Notes: ------------ "/" and "-" are both allowable starting tokens for flags passed to the compiler i.e. -Qipo and /Qipo are identical switches. Portability options for CPU2000: ------------------------------- 175.vpr: -------- -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes 176.gcc: -------- -Dalloca=_alloca : Use the built-in optimized alloca /Fn : 176.gcc uses alloca and this options tells the linker to pre-allocate n bytes of stack. The default amount of stack allocated is not enough and 176.gcc crashes with a run-time error 178.galgel: ----------- -FI : Fixed-format F90 source code. 181.mcf: -------- -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes 186.crafty: ----------- -DNT_i386 : Specifies that it is a Windows NT Intel processor-based system which makes the compiler use "long long" as the 64-bit variable that 186.crafty needs. 252.eon: -------- -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes 253.perlbmk: ------------ -DSPEC_CPU2000_NTOS: This enables the code changes for porting to Windows get included -DPERLDLL : On Windows, we need a perl.exe instead of a perl.exe and perl.dll. This pre-define ensures that the changes necessary to get a single, UNIX-style executible without getting the indirect calls that can cause a 10% performance degradation. This allows the Windows-based executible to be as close as possible to the Unix-based one. -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes 254.gap: -------- -DSPEC_CPU2000 : -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes 255.vortex: ----------- -DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes