refactor according to issues/69

src/fp.cpp

@@ -387,25 +387,24 @@ bool Op::init(const mpz_class& _p, size_t maxBitSize, int _xi_a, Mode mode, size
 
 #if defined(MCL_USE_LLVM) || defined(MCL_USE_XBYAK)
 	if (mode == FP_AUTO || mode == FP_LLVM || mode == FP_XBYAK) {
-		const char *pStr = "0xfffffffffffffffffffffffffffffffeffffffffffffffff";
+		const struct {
-		bool b;
+			PrimeMode mode;
-		mpz_class p192;
+			const char *str;
-		gmp::setStr(&b, p192, pStr);
+		} tbl[] = {
-		if (b && mp == p192) {
+			{ PM_NIST_P192, "0xfffffffffffffffffffffffffffffffeffffffffffffffff" },
-			primeMode = PM_NIST_P192;
+			{ PM_NIST_P521, "0x1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" },
-			isMont = false;
+		};
-			isFastMod = true;
+		// user fastMode for special primes
-		}
+		for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
-	}
+			bool b;
-	if (mode == FP_AUTO || mode == FP_LLVM || mode == FP_XBYAK) {
+			mpz_class target;
-		const char *pStr = "0x1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";
+			gmp::setStr(&b, target, tbl[i].str);
-		bool b;
+			if (b && mp == target) {
-		mpz_class p521;
+				primeMode = tbl[i].mode;
-		gmp::setStr(&b, p521, pStr);
+				isMont = false;
-		if (b && mp == p521) {
+				isFastMod = true;
-			primeMode = PM_NIST_P521;
+				break;
-			isMont = false;
+			}
-			isFastMod = true;
 		}
 	}
 #endif