[sdcc-devel] LTO I have done in recent 4 months

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Acording to my work requirement, a small 8-bit mcu with 9bit RAM addr 13bit ROM addr，without banking.
I use SDCC and  gputils for it. I have tried a lot of. 
Recently, I did 2 LTO pass in gputils's linker:
1) remove unused global variable (initialized or uninitialized).
2) Reuse temporary ram variable accross different functions. 
In this pass , I  construct the call-graph with main、intterrupt0、interrupt1 as the root. when two functions are in one call-graph, they can share compiler allocated global ram variables.
Great, it works.


月明风清
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