spilling regter what is
Definition of Register Spilling for programmer: there are more live variables than the register can.

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Definition Register Spilling

Explanation: Register spilling occurs during a program compilation where there are more live variables than the register can hold. When a compiler is generating machine code and there are more live variables than the machine has registers, it has to transfer or "spill" some variables from registers to memory. This incurrs at certain cost, as access from memory is typically slower than access from a register.

Other definitions in programming such as Register Spilling in Dictionary R.