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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 566660ef3b4d
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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><DIV
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><H1
><A
NAME="AEN806"
></A
>Chapter 4. LWLINK</H1
><P
>The LWTOOLS linker is called LWLINK. This chapter documents the various features
of the linker.</P
><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="AEN809"
>4.1. Command Line Options</A
></H1
><P
>The binary for LWLINK is called "lwlink". Note that the binary is in lower
case. lwlink takes the following command line arguments.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><CODE
CLASS="OPTION"
>--decb</CODE
>, <CODE
CLASS="OPTION"
>-b</CODE
></DT
><DD
><P
>Selects the DECB output format target. This is equivalent to <CODE
CLASS="OPTION"
>--format=decb</CODE
></P
></DD
><DT
><CODE
CLASS="OPTION"
>--output=FILE</CODE
>, <CODE
CLASS="OPTION"
>-o FILE</CODE
></DT
><DD
><P
>This option specifies the name of the output file. If not specified, the
default is <CODE
CLASS="OPTION"
>a.out</CODE
>.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--format=TYPE</CODE
>, <CODE
CLASS="OPTION"
>-f TYPE</CODE
></DT
><DD
><P
>This option specifies the output format. Valid values are <CODE
CLASS="OPTION"
>decb</CODE
>
and <CODE
CLASS="OPTION"
>raw</CODE
></P
></DD
><DT
><CODE
CLASS="OPTION"
>--raw</CODE
>, <CODE
CLASS="OPTION"
>-r</CODE
></DT
><DD
><P
>This option specifies the raw output format.
It is equivalent to <CODE
CLASS="OPTION"
>--format=raw</CODE
>
and <CODE
CLASS="OPTION"
>-f raw</CODE
></P
></DD
><DT
><CODE
CLASS="OPTION"
>--script=FILE</CODE
>, <CODE
CLASS="OPTION"
>-s</CODE
></DT
><DD
><P
>This option allows specifying a linking script to override the linker's
built in defaults.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--section-base=SECT=BASE</CODE
></DT
><DD
><P
>Cause section SECT to load at base address BASE. This will be prepended
to the built-in link script. It is ignored if a link script is provided.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--map=FILE</CODE
>, <CODE
CLASS="OPTION"
>-m FILE</CODE
></DT
><DD
><P
>This will output a description of the link result to FILE.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--library=LIBSPEC</CODE
>, <CODE
CLASS="OPTION"
>-l LIBSPEC</CODE
></DT
><DD
><P
>Load a library using the library search path. LIBSPEC will have "lib" prepended
and ".a" appended.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--library-path=DIR</CODE
>, <CODE
CLASS="OPTION"
>-L DIR</CODE
></DT
><DD
><P
>Add DIR to the library search path.</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.</P
></DD
></DL
></DIV
></DIV
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