Weirdness in disassembly

[Frank Ch. Eigler]

Hi -

On Fri, Sep 27, 2002 at 04:46:42PM +0200, Michael Chapman wrote:
> I have just started out to experiment with cgen.

Welcome!

> I have instructions which are 16 and 32 bits long.
> The assembler generates the right instructions with
> the right lengths. [...]

The choice of parameters in the define-isa clause is crucial
for variable-length instruction sets.  If any of your 32-bit
instructions contain any fixed bit patterns in the second 16
bits, you need to set "base-insn-bitsize 32", since opcodes/simulators
will need to fetch 32 bits to uniquely identify a cgen-level
instruction.  Setting that to 16 could explain what you're seeing.


- FChE
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