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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 b30091890d62
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>2.2. DECB Binaries</A
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>A DECB binary is compatible with the LOADM command in Disk Extended
Color Basic on the CoCo. They are also compatible with CLOADM from Extended
Color Basic. These binaries include the load address of the binary as well
as encoding an execution address. These binaries may contain multiple loadable
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>Each binary starts with a preamble. Each preamble is five bytes long. The
first byte is zero. The next two bytes specify the number of bytes to load
and the last two bytes specify the address to load the bytes at. Then, a
string of bytes follows. After this string of bytes, there may be another
preamble or a postamble. A postamble is also five bytes in length. The first
byte of the postamble is $FF, the next two are zero, and the last two are
the execution address for the binary.</P
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>Both LWASM and LWLINK can output this format.</P
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