refactor: export range_check inner shift and number of parts

Author: zmalatrax

src/builtins/builtin.ts

@@ -2,7 +2,7 @@ import { SegmentValue } from 'primitives/segmentValue';
 
 import { outputHandler } from './output';
 import { CELLS_PER_PEDERSEN, pedersenHandler } from './pedersen';
-import { rangeCheckHandler } from './rangeCheck';
+import { rangeCheckHandler, RC_BITS, RC_BITS_96 } from './rangeCheck';
 import { CELLS_PER_ECDSA, ecdsaHandler } from './ecdsa';
 import { bitwiseHandler, CELLS_PER_BITWISE } from './bitwise';
 import { CELLS_PER_EC_OP, ecOpHandler } from './ecop';
@@ -30,13 +30,13 @@ const BUILTIN_HANDLER: {
 } = {
   output: outputHandler,
   pedersen: pedersenHandler,
-  range_check: rangeCheckHandler(128n),
+  range_check: rangeCheckHandler(RC_BITS),
   ecdsa: ecdsaHandler,
   bitwise: bitwiseHandler,
   ec_op: ecOpHandler,
   keccak: keccakHandler,
   poseidon: poseidonHandler,
-  range_check96: rangeCheckHandler(96n),
+  range_check96: rangeCheckHandler(RC_BITS_96),
   segment_arena: segmentArenaHandler,
 };
 

src/builtins/rangeCheck.ts

@@ -3,6 +3,18 @@ import { BuiltinHandler } from './builtin';
 import { isFelt } from 'primitives/segmentValue';
 import { ExpectedFelt } from 'errors/primitives';
 
+export const INNER_RC_BOUND_SHIFT = 16;
+export const INNER_RC_BOUND_MASK = 0xffffn;
+
+export const RC_N_PARTS = 8;
+export const RC_N_PARTS_96 = 6;
+
+/** Bound exponent of the range_check builtin, `128`. */
+export const RC_BITS = BigInt(INNER_RC_BOUND_SHIFT * RC_N_PARTS);
+
+/** Bound exponent of the range_check96 builtin, `96`. */
+export const RC_BITS_96 = BigInt(INNER_RC_BOUND_SHIFT * RC_N_PARTS_96);
+
 export const rangeCheckHandler = (boundExponent: bigint): BuiltinHandler => {
   return {
     set(target, prop, newValue): boolean {