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Fix code generation error in gcc6809 It turned out that under some circumstances, the gcc optimizer would select an instruction sequence that had the sense of a branch inverted. It seems this was due to a particular instruction pattern included in the machine description not being quite right with respect to how the condition codes were tracked. Removing that instruction pattern seems to fix things (subtraction with the arguments reversed). gcc seems to be smart enough to figure out how to reorganize code to work without this reversed sense subtraction and then do the right thing.
author William Astle <lost@l-w.ca>
date Thu, 24 Mar 2016 20:07:20 -0600
parents fc166b3bbae3
children
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><A
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>Chapter 5. Libraries and LWAR</H1
><P
>LWTOOLS also includes a tool for managing libraries. These are analogous to
the static libraries created with the "ar" tool on POSIX systems. Each library
file contains one or more object files. The linker will treat the object
files within a library as though they had been specified individually on
the command line except when resolving external references. External references
are looked up first within the object files within the library and then, if
not found, the usual lookup based on the order the files are specified on
the command line occurs.</P
><P
>The tool for creating these libary files is called LWAR.</P
><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="AEN1005"
>5.1. Command Line Options</A
></H1
><P
>The binary for LWAR is called "lwar". Note that the binary is in lower
case. The options lwar understands are listed below. For archive manipulation
options, the first non-option argument is the name of the archive. All other
non-option arguments are the names of files to operate on.</P
><P
></P
><DIV
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><DL
><DT
><CODE
CLASS="OPTION"
>--add</CODE
>, <CODE
CLASS="OPTION"
>-a</CODE
></DT
><DD
><P
>This option specifies that an archive is going to have files added to it.
If the archive does not already exist, it is created. New files are added
to the end of the archive.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--create</CODE
>, <CODE
CLASS="OPTION"
>-c</CODE
></DT
><DD
><P
>This option specifies that an archive is going to be created and have files
added to it. If the archive already exists, it is truncated.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--merge</CODE
>, <CODE
CLASS="OPTION"
>-m</CODE
></DT
><DD
><P
>If specified, any files specified to be added to an archive will be checked
to see if they are archives themselves. If so, their constituent members are
added to the archive. This is useful for avoiding archives containing archives.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--list</CODE
>, <CODE
CLASS="OPTION"
>-l</CODE
></DT
><DD
><P
>This will display a list of the files contained in the archive.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--debug</CODE
>, <CODE
CLASS="OPTION"
>-d</CODE
></DT
><DD
><P
>This option increases the debugging level. It is only useful for LWTOOLS
developers.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--help</CODE
>, <CODE
CLASS="OPTION"
>-?</CODE
></DT
><DD
><P
>This provides a listing of command line options and a brief description
of each.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--usage</CODE
></DT
><DD
><P
>This will display a usage summary
of each command line option.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--version</CODE
>, <CODE
CLASS="OPTION"
>-V</CODE
></DT
><DD
><P
>This will display the version of LWLINK.
of each.</P
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