Issue 031002.1: Where is OP_piece Value Stored?
Given a location expression that specifies that a "piece" of a value is
in a register, and that "piece" is smaller than the register, where is it?
For instance, the small struct:
struct small { char c[6]; };
on a 32 bit ISA might reside in the two adjacent registers r2:r3 leading
to a location expression like:
register r2 piece 4, register r3 piece 2
my question is, where in "r3", are those two bytes?
Sometimes it can be guessed by knowing the ABI - for instance by
assuming "left" or "right" alignment. However, sometimes the compiler
forgets to follow the ABI :-(
Is there a way of specifying this that doesn't require specific compiler
knowledge?
PROPOSAL:
Add the following:
"DW_OP_piece on a partial register is implementation defined."
