XL Fortran Enterprise Edition for AIX : User's Guide - IBM

Table 5. Options for Performance Optimization (continued)
Command-Line
Option
-P{v|k}[!]
-p
-pg
-Q
-Q!
-Q+names
-Q-names
-qalias=
{[no]aryovrlp |
[no]intptr|
[no]pteovrlp|
[no]std}...]
-qalign={[no]4k|
struct {=subopt}|
bindc {=subopt}}
-qarch=architecture
-qassert={ deps |
nodeps | itercnt=n}
@PROCESS
Directive
ALIAS(
{[NO]ARYOVRLP
|[NO]INTPTR
|[NO]PTEOVRLP
|[NO]STD}... )
ALIGN(
{[NO]4K|
STRUCT{(subopt)}|
BINDC{(subopt)}})
Description
Invokes the selected optimizing
preprocessor. Adding ! prevents the
compilation step from following
preprocessing.
Note: The preprocessors are available as
separate vendor-logo products.
Default: No preprocessing.
Sets up the object file for profiling.
Default: No profiling.
Specifies whether procedures are inlined
and/or particular procedures that should or
should not be inlined. names is a list of
procedure names separated by colons.
Default: No inlining.
Indicates whether a program contains
certain categories of aliasing. The compiler
limits the scope of some optimizations
when there is a possibility that different
names are aliases for the same storage
locations.
Default: -
qalias=aryovrlp:nointptr:pteovrlp:std for
the xlf90, xlf90_r7, xlf95, xlf95_r, xlf95_r7,
f90, and f95 commands; -qalias=
aryovrlp:intptr:pteovrlp:std for the xlf,
xlf_r, xlf_r7, f77, and fort77, commands.
Specifies the alignment of data objects in
storage, which avoids performance
problems with misaligned data. The [no]4k,
bindc, and struct options can be specified
and are not mutually exclusive. The [no]4k
option is useful primarily in combination
with logical volume I/O and disk striping.
Default: -
qalign=no4k:struct=natural:bindc=power
Controls which instructions the compiler
can generate. Changing the default can
improve performance but might produce
code that can only be run on specific
machines. The choices are auto, com, pwr,
pwr2 (or pwrx), pwr2s, p2sc, 601, 603, 604,
ppc, ppcgr, ppc64, ppc64gr, ppc64grsq,
rs64a, rs64b, rs64c, pwr3, pwr4, pwr5, and
ppc970.
Default: -qarch=com if you specify -q32,
which uses only instructions that are
common to all platforms. If you specify
-q64, the default is ppc64, which allows
you to run the executable file on any 64-bit
PowerPC hardware platform.
Provides information about the
characteristics of the files that can help to
fine-tune optimizations.
Default: -qassert=deps:itercnt=1024
See
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XL Fortran Compiler-Option Reference 71