Mercurial > hg > index.cgi
view docs/manual/x46.html @ 418:3832a68d83ef
Fix internal compiler error on "var2 = var1 + 1" patterns
This appears to be the correct fix. It was provided by Tormod Volden
(debian.tormod@gmail.com). The final commit is substantially different from
Tormod's submission mostly due to housecleaning (removing the old patches
and updating the README). Tormod's comments follow.
The original addhi_mem_1 "insn" instruction pattern /matches/ two
memory operands, just with the /constraint/ that these are the same
location. A pattern match tells the compiler "you should be able to use
this, but you might have to work on it to meet the constraints". For
typical constraints on registers the compiler can add "reloads", moving
stuff between registers or from memory, until the constraints are met
and the instruction can be used. However, in this case, no amount of
reloads can make two memory locations the same if they already weren't,
so the compiler breaks down and cries "unable to generate reloads".
It seems this issue only appears if optimization is enabled. The proof
is in gcc's reload.c and is left as an exercise to the reader.
Limiting the matching pattern to identical memory operands avoids
these situations, while allowing the common "var++" cases.
References:
The pattern/constraints difference is explained in
https://gcc.gnu.org/onlinedocs/gccint/Simple-Constraints.html#index-other-register-constraints-3335
author | William Astle <lost@l-w.ca> |
---|---|
date | Tue, 29 Mar 2016 21:21:49 -0600 |
parents | b30091890d62 |
children |
line wrap: on
line source
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >OS9 Modules</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="LW Tool Chain" HREF="index.html"><LINK REL="UP" TITLE="Output Formats" HREF="c21.html"><LINK REL="PREVIOUS" TITLE="Intel Hex" HREF="x41.html"><LINK REL="NEXT" TITLE="Object Files" HREF="x54.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >LW Tool Chain</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="x41.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 2. Output Formats</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x54.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="AEN46" >2.6. OS9 Modules</A ></H1 ><P > Since version 2.5, LWASM is able to generate OS9 modules. The syntax is basically the same as for other assemblers. A module starts with the MOD directive and ends with the EMOD directive. The OS9 directive is provided as a shortcut for writing system calls. </P ><P > LWASM does NOT provide an OS9Defs file. You must provide your own. Also note that the common practice of using "ifp1" around the inclusion of the OS9Defs file is discouraged as it is pointless and can lead to unintentional problems and phasing errors. Because LWASM reads each file exactly once, there is no benefit to restricting the inclusion to the first assembly pass. </P ><P > As of version 4.5, LWASM also implements the standard data/code address streams for OS9 modules. That means that between MOD and EMOD, any RMB, RMD, RMQ, or equivalent directives will move the data address ahead and leave the code address unmodified. Outside of an actual module, both the code and data addresses are moved ahead equally. That last bit is critical to understand because it means any directives that follow an EMOD directive may have different results than other assemblers. </P ><P > Additionally, within a module body, the ORG directive sets only the data address, not the code address. However, outside a module body, ORG sets both addresses. </P ><P >Both code and data addresses are reset to 0 by the MOD directive.</P ><P > As of version 4.5, LWLINK also supports creation of OS9 modules. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="x41.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x54.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Intel Hex</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="c21.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Object Files</TD ></TR ></TABLE ></DIV ></BODY ></HTML >