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SP_UNWRITTEN

thruput_native_exec::rv32_stack_usage

Constant SP_UNWRITTEN 

Source 
pub const SP_UNWRITTEN: u32 = u32::MAX /* 4_294_967_295u32 */;
Expand description

The value Rv32StackUsage::sp_initial and Rv32StackUsage::sp_min hold when the guest never wrote sp.