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.TH powertrans 1

.SH NAME

powertrans \- POWER TDF translator

.SH SYNOPSIS

\fBpowertrans\fR [ \fIoptions\fR ] \fIinput-file\fR \fIoutput-file\fR

.SH DESCRIPTION

The code production portion of the TDF compiler is under the control of

a TDF translator, which translates a TDF capsule into an assembly source

file.  There are separate TDF translators for each target architecture.

This manual page describes the translator which produces assembly code

common to the rs6000 and the POWERPc.

.PP

It is recommended that \fBpowertrans\fR is not invoked directly, but via the

user interface \fItcc\fR(1tdf).  The option \fB-\fIopt\fR can be passed

to \fBpowertrans\fR by passing the option \fB-Wt,-\fIopt\fR to \fItcc\fR.

.\" ----------------------------------------------------------------------

.SH OPTIONS

These options are common to most translators, although the defaults may vary.

\fIswitch\fR stands for either \fB0\fR, to switch an option off, or \fB1\fR,

to switch it on.

.\" ----------------------------------------------------------------------

.IP \fB-A\fIswitch\fR

This option determines whether \fBpowertrans\fR should inline calls to

\fIalloca\fR.  This is done by default.

.\" ----------------------------------------------------------------------

.IP \fB-B\fIswitch\fR

This option determines whether \fBpowertrans\fR should report floating point

constants which exceed their range.  This is done by default.

If this option is switched off such constants are replaced by infinity.

.\" ----------------------------------------------------------------------

.IP \fB-C\fIswitch\fR

This option determines whether \fBpowertrans\fR should apply the "constants

out of loops" optimisation.  This is done by default.

.\" ----------------------------------------------------------------------

.IP \fB-E\fR

This option disables \fBpowertrans\fR's constant overflow checks.

.\" ----------------------------------------------------------------------

.IP \fB-F\fIswitch\fR

This option determines whether \fBpowertrans\fR should apply the "for all"

optimisation.  This is done by default.

.\" ----------------------------------------------------------------------

.IP \fB-H\fR

This option causes \fBpowertrans\fR to output debugging information in its

output file.  This will only work if the input TDF capsule contains

debugging information.

.\" ----------------------------------------------------------------------

.IP \fB-I\fIswitch\fR

This option determines whether \fBpowertrans\fR should apply the "inlining"

optimisation.  This is done by default.

.\" ----------------------------------------------------------------------

.IP \fB-K\fIstr\fR

Causes \fBpowertrans\fR to optimise its code for a particular processor

model, determined by \fIstr\fR. Currently "P" is supported for the

POWERPc and "R" for the rs6000. 

.\" ----------------------------------------------------------------------

.IP \fB-M\fIswitch\fR

This option determines whether \fBpowertrans\fR preserves division by a

floating point constant rather than replacing it by multiplication by

the reciprocal of the constant.  While the latter produces faster code,

it may lead to rounding errors.  By default, division by constants is

preserved.

.\" ----------------------------------------------------------------------

.IP \fB-P\fR

This option causes \fBpowertrans\fR to output profiling information suitable

for use with \fIprof\fR(1) or a similar tool (see individual manual

pages for details).

.\" ----------------------------------------------------------------------

.IP \fB-Q\fR

This option causes \fBpowertrans\fR to quit before processing its input

files.  This is particularly useful in conjunction with \fB-V\fR.

.\" ----------------------------------------------------------------------

.IP \fB-R\fIswitch\fR

This option determines whether \fBpowertrans\fR should immediately round every

floating point operation to its appropriate range.  This produces slower

code, but is necessary for strict IEEE conformance.  It is  done by default.

.\" ----------------------------------------------------------------------

.IP \fB-U\fIswitch\fR

This option determines whether \fBpowertrans\fR should apply the "loop

unrolling" optimisation.  This is done by default.

.\" ----------------------------------------------------------------------

.IP \fB-V\fR

This option causes \fBpowertrans\fR to print its version number and the

version of the TDF specification it supports.

.\" ----------------------------------------------------------------------

.IP \fB-W\fIswitch\fR

This option determines whether \fBpowertrans\fR makes string literals

writable. At present all string literals are writable, and this cannot be

altered. 

.\" ----------------------------------------------------------------------

.IP \fB-X\fR

This option disables all optimisations.  All \fBpowertrans\fR's optimisations

are believed to be valid, so that any error in optimisation is a genuine

bug.

.\" ----------------------------------------------------------------------

.IP \fB-Z\fR

This option causes \fBpowertrans\fR to print the version number of all the

TDF capsules it decodes.

.\" ----------------------------------------------------------------------

.SH SEE ALSO

\fIas\fR(1), \fIprof(1)\fR, \fIalphatrans\fR(1), \fIhppatrans\fR(1),

\fImipstrans\fR(1), \fIsparctrans\fR(1), \fItrans386\fR(1), \fItcc\fR(1).

.\" ----------------------------------------------------------------------