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The ldc (load constant) instruction requires an operand that is a
constant value stored in a simple_immed structure. These
constant values may be integers or floating-point numbers or symbolic
addresses. A simple_immed contains a union of these fields
along with a tag to identify which field is used. The tag value may be
IMMED_INT, IMMED_FLOAT, or
IMMED_SYMBOL.
A symbolic address is specified by a symbol and a constant integer
offset. The offset is specified in terms of bits. For example, to get
the address of a field within a structure, the simple_immed
would contain a pointer to the simple_sym of the variable
with the offset equal to the number of bits between the beginning of the
structure and the desired field.
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