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DELL
SPEC CPU2000 FLAG DESCRIPTIONS
- INTEL C++ AND FORTRAN COMPILERS 5.0.1
- dell.cpu2000.ic5.0.1.itanium.26jun2001.cfg
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INTEL C++ COMPILER 5.0.1 FLAG DESCRIPTIONS
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-GR[-] Enables [disables (DEFAULT)] C++ Runtime Type Information (RTTI).
-GX[-] Enables [disables (DEFAULT)] C++ exception handling.
-O{1|2|3} 1: optimize for speed, but disable some optimizations that
increase code size for a small speed benefit. Includes
inline expansion for intrinsic functions, global
optimizations, string pooling optimizations.
2: optimizes for speed (DEFAULT). The -O2 option includes O1
optimizations and in addition enables inlining of
intrinsics and more speed optimizations.
3: builds on -01 and -02 optimizations by enabling high-level
optimization. This level does not guarantee higher performance
unless loop and memory access transformation take place. In
conjunction with -QaxK/-QxK and QaxW/QxW, this switch causes
the compiler to perform more aggressive data dependency
analysis than for -O2. This may result in longer compilation
times.
-Qip Enable single-file IP optimizations (within files, same as -Ob2).
-Qipo Enable multi-file IP optimizations (between files).
- 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 optimization.
-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.
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INTEL FORTRAN COMPILER 5.0.1 FLAG DESCRIPTIONS
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/O{1|2|3} 1: optimize for speed, but disable some optimizations that
increase code size for a small speed benefit. Includes
inline expansion for intrinsic functions, global
optimizations, string pooling optimizations.
2: optimizes for speed (DEFAULT). The -O2 option includes O1
optimizations and in addition enables inlining of
intrinsics and more speed optimizations.
3: builds on -01 and -02 optimizations by enabling high-level
optimization. This level does not guarantee higher performance
unless loop and memory access transformation take place. In
conjunction with -QaxK/-QxK and QaxW/QxW, this switch causes
the compiler to perform more aggressive data dependency
analysis than for -O2. 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 Enable multi-file IP optimizations (between files).
- 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.
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MISCELLANEOUS
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The starting tokens "/" and "-" are both equivalent for flags passed to the
compiler. For example, -QxK and /QxK are identical switches.
+FDO PASS1= /Qprof_gen PASS2= /Qprof_use
Using feedback-directed optimization, a profile is generated
on the first pass of compilation and used on the second pass.
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PORTABILITY OPTIONS FOR CPU2000
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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:
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-FI : Fixed-format F90 source code.
181.mcf:
--------
-DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes
186.crafty:
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-DNT_i386 : Specifies that it is a Windows NT Intel
processor-based system which makes the compiler
use "_int64" as the 64-bit variable that
186.crafty needs.
252.eon:
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-DSPEC_CPU2000_P64: Necessary to enable the P64 porting changes
253.perlbmk:
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-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