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20160706 - Low Cost Branching to Factoring Out Loop Exit Check
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+Threading to hide pipeline depth combined with an ISA which makes branching cheep is one goal.
+Specifically absolute branching with immediate destination in the opcode word
+(single word branch/call, no adder), and instructions which include a return flag (make returns free).
+Enables easy computed branches, both for jump tables, and loops.
+Can factor out loop check into hierarchical call tree,
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+Do4: Unroll work four times; Return;
+Do16: Call Do4; Call Do4; Call Do4; Jump Do4;
+Do64: Call Do16; Call Do16; Call Do16; Jump Do16;
+... etc ...
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+Can use a computed branch to jump into the tree for other loop counts.
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