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+### Parameters
+
+* BASE_GAS_COST: 80
+* CODE_BYTES_PER_GAS: 15
+
+### Specification
+
+At `0xf5`, add an opcode `PURE_CALL` that takes seven arguments from the stack: GAS, CODESTART, CODELENGTH, DATASTART, DATALENGTH, OUTPUTSTART, OUTPUTLENGTH.
+
+Let:
+
+* `gas_cost = BASE_GAS_COST + floor(CODELENGTH / CODE_BYTES_PER_GAS)`.
+* `input_gas` be the remaining gas in the current context, minus gas costs for expanding memory to cover the three memory slices given above.
+
+Fail if `input_gas < gas_cost` or if `CODELENGTH > 24000`; otherwise execute a call with code equal to the memory slice `CODESTART...CODESTART + CODELENGTH - 1`, input data equal to the memory slice `DATASTART...DATASTART + DATALENGTH - 1`, gas equal to `min(GAS, (input_gas - gas_cost) - floor((input_gas - gas_cost) / 64))` and value 0. The inner context may NOT read state, write state or make any sub-calls except to non-state-changing precompiles; any attempt to do so throws an exception. If execution succeeds, fill the memory slice `OUTPUTSTART...OUTPUTSTART + OUTPUTLENGTH - 1` with the return data with similar rules to how this is handled in CALL, CALLCODE and DELEGATECALL, and push 1 onto the stack. If execution fails, push 0 onto the stack.
+
+### Rationale
+
+This is useful for:
+
+* Adding functional programming features for higher-level languages
+* Generally allowing for forms of computation that are safer and can be efficiently optimized/memoized due to their state-independence
+* Processing validation code for Casper validators in the future