------------------------------------------------------
DELL
SPEC CPU2000 FLAG DESCRIPTIONS
- INTEL C++ AND FORTRAN COMPILERS 5.0
- dell.cpu2000.ic50.piii.14nov2000.cfg
- dell.cpu2000.ic50.p4.14nov2000.cfg
- dell.cpu2000.ic50.p4.01feb2001.cfg
------------------------------------------------------
------------------------------------------------------
INTEL C++ COMPILER 5.0 FLAG DESCRIPTIONS
------------------------------------------------------
-G{5|6|7} Optimize code specifically for a targeted processor. Includes
one or more of the following characters:
5: Pentium processors with or without MMX technology
6: Pentium Pro, Pentium II, and Pentium III processors
7: Pentium 4 processor
-GR[-] Enables [disables (DEFAULT)] C++ Runtime Type Information (RTTI).
-GX[-] Enables [disables (DEFAULT)] C++ exception handling.
-Oa[-] Assume [do not assume] no aliasing in program.
-Oi[-] Enables (DEFAULT) [disables] inline expansion of standard
library functions.
-Qax{i|M|K|W} Generate code specialized for processor extensions
specified by <codes> while also generating generic IA-32 code.
Includes one or more of the following characters:
i: Pentium Pro and Pentium II processor instructions
M: MMX(TM) instructions
K: SSE extensions
W: SSE2 extensions
-Qx{i|M|K|W} Generate specialized code to run exclusively on processors
supporting the extensions indicated by <codes> as described above.
-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
-Qwp_ipo Additionally to -Qipo, makes the whole program assumption that
all variables and functions seen in compiled sources are
referenced only within those sources; the user must guarantee
that this assumption is safe.
-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.
-Qrcd Improves the performance of code that performs floating
point-to-integer conversion. The optimization is obtained by
controlling the change of the rounding mode.
-Qunroll[n] Specifies the maximum number of times to unroll a loop. Omit n
to let the compiler decide whether to perform unrolling or not.
Use n = 0 to disable unroller.
shlW32M.lib MicroQuill SmartHeap Library 5.0 available from
www.microquill.com
------------------------------------------------------
INTEL FORTRAN COMPILER 5.0 FLAG DESCRIPTIONS
------------------------------------------------------
/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.
/Oa[-] Assume [do not assume] no aliasing in program.
/Ob{0|1|2} Controls the compiler's inline expansion.
0: disable inlining.
1: disables inlining unless /Qip or /Ob2 are specified.
2: enables inlining of any function. However, the compiler
decides which functions are inlined. This option enables
interprocedural optimizations and ahs the same effect as
specifying the /Qip option.
/Qauto Causes all variables to be allocated on the stack, rather than
in local static storage.
/Qax{i|M|K|W} Generate code specialized for processor extensions
specified by <codes> while also generating generic IA-32 code.
Includes one or more of the following characters:
i: Pentium Pro and Pentium II processor instructions
M: MMX(TM) instructions
K: SSE extensions
W: SSE2 extensions
/Qx{i|M|K|W} Generate specialized code to run exclusively on processors
supporting the extensions indicated by <codes> as
described above.
/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
/Qprefetch[-] Enable [disable (DEFAULT)] prefetch insertion. The default
with /O3 is /Qprefetch.
/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.
/Qrcd Improves the performance of code that performs floating
point-to-integer conversion. The optimization is obtained by
controlling the change of the rounding mode.
/Qscalar_rep[-] Enables (DEFAULT) [disables] scalar replacement performed
during loop transformations.
/Qunroll[n] Specifies the maximum number of times to unroll a loop. Omit n
to let the compiler decide whether to perform unrolling or not.
Use n = 0 to disable unroller.
shlW32M.lib MicroQuill SmartHeap Library 5.0 available from
www.microquill.com
------------------------------------------------------
MISCELLANEOUS
------------------------------------------------------
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.
------------------------------------------------------
PORTABILITY OPTIONS FOR CPU2000
------------------------------------------------------
176.gcc:
-Dalloca=_alloca : So as to use the built-in optimized alloca.
/F10000000 : 176.gcc uses alloca and this options tells the
linker to pre-allocate 10MB 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.
/F32000000 : Same as with 176.gcc, pre-allocates a 32MB
stack
186.crafty:
-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.
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-defines 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.
/MT : Use the static multi-threaded library else it
will not compile.
254.gap:
-DSYS_HAS_CALLOC_PROTO :
-DSYS_HAS_MALLOC_PROTO : These two pre-defines tell of the existence of
malloc and calloc prototypes.