strconv: atof_quick for tasks that need speed but not big accuracy

vlib/strconv/atof_test.v

@@ -17,7 +17,8 @@ fn test_atof() {
 		0.004, 
 		-0.004, 
 		0.0, 
-		-0.0
+		-0.0,
+		31234567890123
 	]
 
 	// strings
@@ -27,20 +28,32 @@ fn test_atof() {
 		'0.004',
 		'-0.004',
 		'0.0',
-		'-0.0'
+		'-0.0',
+		'31234567890123',
 	]
 
-	// check conversion1 string <=> string
+	// check conversion case 1 string <=> string
 	for c,x in src_num {
+		// slow atof
 		assert strconv.atof64(src_num_str[c]).strlong() == x.strlong()
+		
+		// quick atof
+		mut s1 := (strconv.atof_quick(src_num_str[c]).str())
+		s1 = s1[..src_num_str[c].len]
+		mut s2 := (x.str())
+		s2 = s2[..src_num_str[c].len]
+		assert s1 == s2
+
+		// test C.atof
 		assert x.strsci(18) == f64(C.atof(src_num_str[c].str)).strsci(18)
 	}
 
-	// check conversion2 string <==> f64
+	// check conversion case 2 string <==> f64
+	// we don't test atof_quick beacuse we already know the rounding error
 	for c,x  in src_num_str {
-		a:=strconv.atof64(x)
+		b := src_num[c].strlong()
-		b:=src_num[c]
+		a1 := strconv.atof64(x).strlong()
-		assert a.strlong() == b.strlong()
+		assert a1 == b
 	}
 
 	// special cases

vlib/strconv/atofq.v

@@ -0,0 +1,325 @@
+/**********************************************************************
+*
+* atof util
+*
+* Copyright (c) 2019 Dario Deledda. All rights reserved.
+* Use of this source code is governed by an MIT license
+* that can be found in the LICENSE file.
+*
+* This file contains utilities for convert a string in a f64 variable in a very quick way
+* IEEE 754 standard is used
+*
+* Know limitation:
+* - round to 0 approximation
+* - loos of precision with big exponents
+*
+*
+**********************************************************************/
+module strconv
+
+// same used in atof, here only for references
+//const(
+//	DOUBLE_PLUS_ZERO        = u64(0x0000000000000000)
+//	DOUBLE_MINUS_ZERO       = 0x8000000000000000
+//	DOUBLE_PLUS_INFINITY    = 0x7FF0000000000000
+//	DOUBLE_MINUS_INFINITY   = 0xFFF0000000000000
+
+// atof_quick return a f64 number from a string in a quick way
+pub fn atof_quick(s string) f64 {
+	mut f    := f64(0.0)  // result
+	mut sign := f64(1.0)  // result sign
+	mut i    :=0          // index
+	
+	// skip white spaces
+	for i < s.len && s[i] == ` ` {
+		i++
+	}
+
+	//check sign
+	if i < s.len {
+		if s[i] == `-` {
+			sign = -1.0
+			i++
+		}else if s[i] == `+` {
+			i++
+		}
+	}
+
+	// infinite
+	if s[i] == `i` && i+2 < s.len && s[i+1] == `n` && s[i+2] == `f` {
+		mut d := *u64(&f)
+		if sign > 0.0 {
+			*d = DOUBLE_PLUS_INFINITY
+		}else{
+			*d = DOUBLE_MINUS_INFINITY
+		}
+		return f
+	}
+
+	// skip zeros
+	for i<s.len && s[i]==`0` {
+		i++
+		// we have a zero, manage it
+		if i >= s.len {
+			mut d := *u64(&f)
+			if sign > 0.0 {
+				*d = DOUBLE_PLUS_ZERO
+			}else{
+				*d = DOUBLE_MINUS_ZERO
+			}
+			return f
+		}
+	}
+
+	// integer part
+	for i < s.len && (s[i] >= `0` && s[i] <= `9`) {
+		f *= f64(10.0)
+		f += f64(s[i] - `0`)
+		i++
+	}
+
+	// decimal point
+	if i < s.len && s[i] == `.` {
+		i++
+		mut frac_mul := f64(0.1)
+		for i < s.len && (s[i] >= `0` && s[i] <= `9`) {
+			f +=  f64(s[i] - `0`) * frac_mul
+			frac_mul *= f64(0.1)
+			i++
+		}
+	}
+
+	// exponent management	
+	if i < s.len && (s[i] == `e` || s[i] == `E`) {
+		i++
+		mut exp := 0
+		mut exp_sign := 1
+
+		// negative exponent
+		if i < s.len {
+			if s[i] == `-` {
+				exp_sign = -1
+				i++
+			}else if s[i] == `+` {
+				i++
+			}
+		}
+
+		// skip zeros
+		for i < s.len && s[i] == `0` {
+			i++
+		}
+
+		for i < s.len && (s[i] >= `0` && s[i] <= `9`) {
+			exp *= 10
+			exp += int(s[i] - `0`)
+			i++
+		}
+
+		if exp_sign == 1 {
+			if exp > pos_exp.len {
+				mut d := *u64(&f)
+				if sign > 0 {
+					*d = DOUBLE_PLUS_INFINITY
+				}else{
+					*d = DOUBLE_MINUS_INFINITY
+				}
+				return f
+			}
+			tmp_mul := f64(0.0)
+			mut ptr_d := *u64(&tmp_mul)
+			*ptr_d = pos_exp[exp]
+			//C.printf("exp: %d  [0x%016llx] %f,",exp,pos_exp[exp],tmp_mul)
+			f = f * tmp_mul
+		} else {
+			if exp > neg_exp.len {
+				mut d := *u64(&f)
+				if (sign > 0) {
+					*d = DOUBLE_PLUS_ZERO
+				}else{
+					*d = DOUBLE_MINUS_ZERO
+				}
+				return f
+			}
+			tmp_mul := f64(0.0)
+			mut ptr_d := *u64(&tmp_mul)
+			*ptr_d = neg_exp[exp]
+			//C.printf("exp: %d  [0x%016llx] %f,",exp,pos_exp[exp],tmp_mul)
+			f = f * tmp_mul
+		}
+
+	}
+	
+	f = f * sign
+	return f
+}
+
+const(
+// positive exp of 10 binary form
+pos_exp = [
+0x3ff0000000000000,
+0x4024000000000000,0x4059000000000000,0x408f400000000000,0x40c3880000000000,
+0x40f86a0000000000,0x412e848000000000,0x416312d000000000,0x4197d78400000000,
+0x41cdcd6500000000,0x4202a05f20000000,0x42374876e8000000,0x426d1a94a2000000,
+0x42a2309ce5400000,0x42d6bcc41e900000,0x430c6bf526340000,0x4341c37937e08000,
+0x4376345785d8a000,0x43abc16d674ec800,0x43e158e460913d00,0x4415af1d78b58c40,
+0x444b1ae4d6e2ef50,0x4480f0cf064dd592,0x44b52d02c7e14af6,0x44ea784379d99db4,
+0x45208b2a2c280291,0x4554adf4b7320335,0x4589d971e4fe8402,0x45c027e72f1f1281,
+0x45f431e0fae6d721,0x46293e5939a08cea,0x465f8def8808b024,0x4693b8b5b5056e17,
+0x46c8a6e32246c99c,0x46fed09bead87c03,0x4733426172c74d82,0x476812f9cf7920e3,
+0x479e17b84357691b,0x47d2ced32a16a1b1,0x48078287f49c4a1d,0x483d6329f1c35ca5,
+0x48725dfa371a19e7,0x48a6f578c4e0a061,0x48dcb2d6f618c879,0x4911efc659cf7d4c,
+0x49466bb7f0435c9e,0x497c06a5ec5433c6,0x49b18427b3b4a05c,0x49e5e531a0a1c873,
+0x4a1b5e7e08ca3a8f,0x4a511b0ec57e649a,0x4a8561d276ddfdc0,0x4ababa4714957d30,
+0x4af0b46c6cdd6e3e,0x4b24e1878814c9ce,0x4b5a19e96a19fc41,0x4b905031e2503da9,
+0x4bc4643e5ae44d13,0x4bf97d4df19d6057,0x4c2fdca16e04b86d,0x4c63e9e4e4c2f344,
+0x4c98e45e1df3b015,0x4ccf1d75a5709c1b,0x4d03726987666191,0x4d384f03e93ff9f5,
+0x4d6e62c4e38ff872,0x4da2fdbb0e39fb47,0x4dd7bd29d1c87a19,0x4e0dac74463a989f,
+0x4e428bc8abe49f64,0x4e772ebad6ddc73d,0x4eacfa698c95390c,0x4ee21c81f7dd43a7,
+0x4f16a3a275d49491,0x4f4c4c8b1349b9b5,0x4f81afd6ec0e1411,0x4fb61bcca7119916,
+0x4feba2bfd0d5ff5b,0x502145b7e285bf99,0x50559725db272f7f,0x508afcef51f0fb5f,
+0x50c0de1593369d1b,0x50f5159af8044462,0x512a5b01b605557b,0x516078e111c3556d,
+0x5194971956342ac8,0x51c9bcdfabc1357a,0x5200160bcb58c16c,0x52341b8ebe2ef1c7,
+0x526922726dbaae39,0x529f6b0f092959c7,0x52d3a2e965b9d81d,0x53088ba3bf284e24,
+0x533eae8caef261ad,0x53732d17ed577d0c,0x53a7f85de8ad5c4f,0x53ddf67562d8b363,
+0x5412ba095dc7701e,0x5447688bb5394c25,0x547d42aea2879f2e,0x54b249ad2594c37d,
+0x54e6dc186ef9f45c,0x551c931e8ab87173,0x5551dbf316b346e8,0x558652efdc6018a2,
+0x55bbe7abd3781eca,0x55f170cb642b133f,0x5625ccfe3d35d80e,0x565b403dcc834e12,
+0x569108269fd210cb,0x56c54a3047c694fe,0x56fa9cbc59b83a3d,0x5730a1f5b8132466,
+0x5764ca732617ed80,0x5799fd0fef9de8e0,0x57d03e29f5c2b18c,0x58044db473335def,
+0x583961219000356b,0x586fb969f40042c5,0x58a3d3e2388029bb,0x58d8c8dac6a0342a,
+0x590efb1178484135,0x59435ceaeb2d28c1,0x59783425a5f872f1,0x59ae412f0f768fad,
+0x59e2e8bd69aa19cc,0x5a17a2ecc414a03f,0x5a4d8ba7f519c84f,0x5a827748f9301d32,
+0x5ab7151b377c247e,0x5aecda62055b2d9e,0x5b22087d4358fc82,0x5b568a9c942f3ba3,
+0x5b8c2d43b93b0a8c,0x5bc19c4a53c4e697,0x5bf6035ce8b6203d,0x5c2b843422e3a84d,
+0x5c6132a095ce4930,0x5c957f48bb41db7c,0x5ccadf1aea12525b,0x5d00cb70d24b7379,
+0x5d34fe4d06de5057,0x5d6a3de04895e46d,0x5da066ac2d5daec4,0x5dd4805738b51a75,
+0x5e09a06d06e26112,0x5e400444244d7cab,0x5e7405552d60dbd6,0x5ea906aa78b912cc,
+0x5edf485516e7577f,0x5f138d352e5096af,0x5f48708279e4bc5b,0x5f7e8ca3185deb72,
+0x5fb317e5ef3ab327,0x5fe7dddf6b095ff1,0x601dd55745cbb7ed,0x6052a5568b9f52f4,
+0x60874eac2e8727b1,0x60bd22573a28f19d,0x60f2357684599702,0x6126c2d4256ffcc3,
+0x615c73892ecbfbf4,0x6191c835bd3f7d78,0x61c63a432c8f5cd6,0x61fbc8d3f7b3340c,
+0x62315d847ad00087,0x6265b4e5998400a9,0x629b221effe500d4,0x62d0f5535fef2084,
+0x630532a837eae8a5,0x633a7f5245e5a2cf,0x63708f936baf85c1,0x63a4b378469b6732,
+0x63d9e056584240fe,0x64102c35f729689f,0x6444374374f3c2c6,0x647945145230b378,
+0x64af965966bce056,0x64e3bdf7e0360c36,0x6518ad75d8438f43,0x654ed8d34e547314,
+0x6583478410f4c7ec,0x65b819651531f9e8,0x65ee1fbe5a7e7861,0x6622d3d6f88f0b3d,
+0x665788ccb6b2ce0c,0x668d6affe45f818f,0x66c262dfeebbb0f9,0x66f6fb97ea6a9d38,
+0x672cba7de5054486,0x6761f48eaf234ad4,0x679671b25aec1d89,0x67cc0e1ef1a724eb,
+0x680188d357087713,0x6835eb082cca94d7,0x686b65ca37fd3a0d,0x68a11f9e62fe4448,
+0x68d56785fbbdd55a,0x690ac1677aad4ab1,0x6940b8e0acac4eaf,0x6974e718d7d7625a,
+0x69aa20df0dcd3af1,0x69e0548b68a044d6,0x6a1469ae42c8560c,0x6a498419d37a6b8f,
+0x6a7fe52048590673,0x6ab3ef342d37a408,0x6ae8eb0138858d0a,0x6b1f25c186a6f04c,
+0x6b537798f4285630,0x6b88557f31326bbb,0x6bbe6adefd7f06aa,0x6bf302cb5e6f642a,
+0x6c27c37e360b3d35,0x6c5db45dc38e0c82,0x6c9290ba9a38c7d1,0x6cc734e940c6f9c6,
+0x6cfd022390f8b837,0x6d3221563a9b7323,0x6d66a9abc9424feb,0x6d9c5416bb92e3e6,
+0x6dd1b48e353bce70,0x6e0621b1c28ac20c,0x6e3baa1e332d728f,0x6e714a52dffc6799,
+0x6ea59ce797fb817f,0x6edb04217dfa61df,0x6f10e294eebc7d2c,0x6f451b3a2a6b9c76,
+0x6f7a6208b5068394,0x6fb07d457124123d,0x6fe49c96cd6d16cc,0x7019c3bc80c85c7f,
+0x70501a55d07d39cf,0x708420eb449c8843,0x70b9292615c3aa54,0x70ef736f9b3494e9,
+0x7123a825c100dd11,0x7158922f31411456,0x718eb6bafd91596b,0x71c33234de7ad7e3,
+0x71f7fec216198ddc,0x722dfe729b9ff153,0x7262bf07a143f6d4,0x72976ec98994f489,
+0x72cd4a7bebfa31ab,0x73024e8d737c5f0b,0x7336e230d05b76cd,0x736c9abd04725481,
+0x73a1e0b622c774d0,0x73d658e3ab795204,0x740bef1c9657a686,0x74417571ddf6c814,
+0x7475d2ce55747a18,0x74ab4781ead1989e,0x74e10cb132c2ff63,0x75154fdd7f73bf3c,
+0x754aa3d4df50af0b,0x7580a6650b926d67,0x75b4cffe4e7708c0,0x75ea03fde214caf1,
+0x7620427ead4cfed6,0x7654531e58a03e8c,0x768967e5eec84e2f,0x76bfc1df6a7a61bb,
+0x76f3d92ba28c7d15,0x7728cf768b2f9c5a,0x775f03542dfb8370,0x779362149cbd3226,
+0x77c83a99c3ec7eb0,0x77fe494034e79e5c,0x7832edc82110c2f9,0x7867a93a2954f3b8,
+0x789d9388b3aa30a5,0x78d27c35704a5e67,0x79071b42cc5cf601,0x793ce2137f743382,
+0x79720d4c2fa8a031,0x79a6909f3b92c83d,0x79dc34c70a777a4d,0x7a11a0fc668aac70,
+0x7a46093b802d578c,0x7a7b8b8a6038ad6f,0x7ab137367c236c65,0x7ae585041b2c477f,
+0x7b1ae64521f7595e,0x7b50cfeb353a97db,0x7b8503e602893dd2,0x7bba44df832b8d46,
+0x7bf06b0bb1fb384c,0x7c2485ce9e7a065f,0x7c59a742461887f6,0x7c9008896bcf54fa,
+0x7cc40aabc6c32a38,0x7cf90d56b873f4c7,0x7d2f50ac6690f1f8,0x7d63926bc01a973b,
+0x7d987706b0213d0a,0x7dce94c85c298c4c,0x7e031cfd3999f7b0,0x7e37e43c8800759c,
+0x7e6ddd4baa009303,0x7ea2aa4f4a405be2,0x7ed754e31cd072da,0x7f0d2a1be4048f90,
+0x7f423a516e82d9ba,0x7f76c8e5ca239029,0x7fac7b1f3cac7433,0x7fe1ccf385ebc8a0
+]
+
+// negative exp of 10 binary form
+neg_exp = [
+0x3ff0000000000000,
+0x3fb999999999999a,0x3f847ae147ae147b,0x3f50624dd2f1a9fc,0x3f1a36e2eb1c432d,
+0x3ee4f8b588e368f1,0x3eb0c6f7a0b5ed8d,0x3e7ad7f29abcaf48,0x3e45798ee2308c3a,
+0x3e112e0be826d695,0x3ddb7cdfd9d7bdbb,0x3da5fd7fe1796495,0x3d719799812dea11,
+0x3d3c25c268497682,0x3d06849b86a12b9b,0x3cd203af9ee75616,0x3c9cd2b297d889bc,
+0x3c670ef54646d497,0x3c32725dd1d243ac,0x3bfd83c94fb6d2ac,0x3bc79ca10c924223,
+0x3b92e3b40a0e9b4f,0x3b5e392010175ee6,0x3b282db34012b251,0x3af357c299a88ea7,
+0x3abef2d0f5da7dd9,0x3a88c240c4aecb14,0x3a53ce9a36f23c10,0x3a1fb0f6be506019,
+0x39e95a5efea6b347,0x39b4484bfeebc2a0,0x398039d665896880,0x3949f623d5a8a733,
+0x3914c4e977ba1f5c,0x38e09d8792fb4c49,0x38aa95a5b7f87a0f,0x38754484932d2e72,
+0x3841039d428a8b8f,0x380b38fb9daa78e4,0x37d5c72fb1552d83,0x37a16c262777579c,
+0x376be03d0bf225c7,0x37364cfda3281e39,0x3701d7314f534b61,0x36cc8b8218854567,
+0x3696d601ad376ab9,0x366244ce242c5561,0x362d3ae36d13bbce,0x35f7624f8a762fd8,
+0x35c2b50c6ec4f313,0x358dee7a4ad4b81f,0x3557f1fb6f10934c,0x352327fc58da0f70,
+0x34eea6608e29b24d,0x34b8851a0b548ea4,0x34839dae6f76d883,0x344f62b0b257c0d2,
+0x34191bc08eac9a41,0x33e41633a556e1ce,0x33b011c2eaabe7d8,0x3379b604aaaca626,
+0x3344919d5556eb52,0x3310747ddddf22a8,0x32da53fc9631d10d,0x32a50ffd44f4a73d,
+0x3270d9976a5d5297,0x323af5bf109550f2,0x32059165a6ddda5b,0x31d1411e1f17e1e3,
+0x319b9b6364f30304,0x316615e91d8f359d,0x3131ab20e472914a,0x30fc45016d841baa,
+0x30c69d9abe034955,0x309217aefe690777,0x305cf2b1970e7258,0x3027288e1271f513,
+0x2ff286d80ec190dc,0x2fbda48ce468e7c7,0x2f87b6d71d20b96c,0x2f52f8ac174d6123,
+0x2f1e5aacf2156838,0x2ee8488a5b445360,0x2eb36d3b7c36a91a,0x2e7f152bf9f10e90,
+0x2e48ddbcc7f40ba6,0x2e13e497065cd61f,0x2ddfd424d6faf031,0x2da97683df2f268d,
+0x2d745ecfe5bf520b,0x2d404bd984990e6f,0x2d0a12f5a0f4e3e5,0x2cd4dbf7b3f71cb7,
+0x2ca0aff95cc5b092,0x2c6ab328946f80ea,0x2c355c2076bf9a55,0x2c0116805effaeaa,
+0x2bcb5733cb32b111,0x2b95df5ca28ef40d,0x2b617f7d4ed8c33e,0x2b2bff2ee48e0530,
+0x2af665bf1d3e6a8d,0x2ac1eaff4a98553d,0x2a8cab3210f3bb95,0x2a56ef5b40c2fc77,
+0x2a225915cd68c9f9,0x29ed5b561574765b,0x29b77c44ddf6c516,0x2982c9d0b1923745,
+0x294e0fb44f50586e,0x29180c903f7379f2,0x28e33d4032c2c7f5,0x28aec866b79e0cba,
+0x2878a0522c7e7095,0x2843b374f06526de,0x280f8587e7083e30,0x27d9379fec069826,
+0x27a42c7ff0054685,0x277023998cd10537,0x2739d28f47b4d525,0x2704a8729fc3ddb7,
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