checker: fix comptime evaluation on infix expr

vlib/math/stats/stats.v

@@ -434,7 +434,7 @@ pub fn covariance_mean[T](data1 []T, data2 []T, mean1 T, mean2 T) T {
 	for i in 0 .. n {
 		delta1 := data1[i] - mean1
 		delta2 := data2[i] - mean2
-		covariance += T((delta1 * delta2 - covariance) / (i + T(1)))
+		covariance += T((delta1 * delta2 - covariance) / (T(i) + T(1)))
 	}
 	return covariance
 }
@@ -459,8 +459,11 @@ pub fn lag1_autocorrelation_mean[T](data []T, mean T) T {
 	for i := 1; i < data.len; i++ {
 		delta0 := data[i - 1] - mean
 		delta1 := data[i] - mean
-		q += T((delta0 * delta1 - q) / (i + T(1)))
-		v += T((delta1 * delta1 - v) / (T(i) + T(1)))
+		d01 := delta0 * delta1
+		d11 := delta1 * delta1
+		ti1 := T(i) + T(1)
+		q += T((d01 - q) / ti1)
+		v += T((d11 - v) / ti1)
 	}
 	return T(q / v)
 }
@@ -486,7 +489,9 @@ pub fn kurtosis_mean_stddev[T](data []T, mean T, sd T) T {
 	*/
 	for i, v in data {
 		x := (v - mean) / sd
-		avg += T((x * x * x * x - avg) / (i + T(1)))
+		x4 := x * x * x * x
+		ti1 := (T(i) + T(1))
+		avg += T((x4 - avg) / ti1)
 	}
 	return avg - T(3)
 }
@@ -511,7 +516,8 @@ pub fn skew_mean_stddev[T](data []T, mean T, sd T) T {
 	*/
 	for i, v in data {
 		x := (v - mean) / sd
-		skew += T((x * x * x - skew) / (i + T(1)))
+		x3 := x * x * x
+		skew += T((x3 - skew) / (T(i) + T(1)))
 	}
 	return skew
 }

vlib/math/stats/stats_test.v

@@ -400,15 +400,15 @@ fn test_covariance() {
 	mut data0 := [10.0, 4.45, 5.9, 2.7]
 	mut data1 := [5.0, 14.45, -15.9, 22.7]
 	mut o := stats.covariance(data0, data1)
-	assert math.alike(o, -17.37078207731247)
+	assert math.alike(o, -17.37078125)
 	data0 = [-3.0, 67.31, 4.4, 1.89]
 	data1 = [5.0, 77.31, 44.4, 11.89]
 	o = stats.covariance(data0, data1)
-	assert math.alike(o, 740.0695419311523)
+	assert math.alike(o, 740.06955)
 	data0 = [12.0, 7.88, 76.122, 54.83]
 	data1 = [2.0, 5.88, 7.122, 5.83]
 	o = stats.covariance(data0, data1)
-	assert math.alike(o, 36.65028190612793)
+	assert math.alike(o, 36.650282000000004)
 
 	// test for int, i64, f32 array
 	data0_int := [1, 2, 3, 1]
@@ -428,13 +428,15 @@ fn test_covariance() {
 fn test_lag1_autocorrelation() {
 	mut data := [10.0, 4.45, 5.9, 2.7]
 	mut o := stats.lag1_autocorrelation(data)
-	assert math.alike(o, -0.554228566606572)
+	mut e := 0.0
+	assert math.alike(o, -0.5542285481446095)
 	data = [-3.0, 67.31, 4.4, 1.89]
 	o = stats.lag1_autocorrelation(data)
-	assert math.alike(o, -0.5102510823460722)
+	assert math.alike(o, -0.5102510654033415)
 	data = [12.0, 7.88, 76.122, 54.83]
 	o = stats.lag1_autocorrelation(data)
-	assert math.alike(o, 0.10484451825170164)
+	e = 0.10484450460892072
+	assert math.alike(o, e), diff(o, e)
 
 	// test for int, i64, f32 array
 	assert stats.lag1_autocorrelation[int]([1, 2, 3, 1]) == 0
@@ -443,54 +445,65 @@ fn test_lag1_autocorrelation() {
 	assert math.alike(o, 0.1975308507680893)
 }
 
+fn diff(actual f64, expected f64) string {
+	return '\n  actual:${actual:40.35f}\nexpected:${expected:40.35f}\n    diff:${actual - expected:40.35f}'
+}
+
 fn test_kurtosis() {
 	mut data := [10.0, 4.45, 5.9, 2.7]
 	mut o := stats.kurtosis(data)
-	assert math.alike(o, -1.0443214689384779)
+	mut e := -1.0443212849233845
+	assert math.close(o, e), diff(o, e)
 	data = [-3.0, 67.31, 4.4, 1.89]
 	o = stats.kurtosis(data)
-	assert math.alike(o, -0.688495594786176)
+	e = -0.6884953374814851
+	assert math.close(o, e), diff(o, e)
 	data = [12.0, 7.88, 76.122, 54.83]
 	o = stats.kurtosis(data)
-	assert math.alike(o, -1.7323772574195067)
+	assert math.alike(o, -1.7323772836921467)
 
 	// test for int, i64, f32 array
 	assert stats.kurtosis[int]([1, 2, 3, 1]) == 1
 	assert stats.kurtosis[i64]([i64(1), 2, 3, 1]) == 1
 	o = stats.kurtosis[f32]([f32(1.0), 3, 5, 7, 3])
-	assert math.alike(o, -1.0443782806396484)
+	e = -1.044378399848938
+	assert math.alike(o, e), diff(o, e)
 }
 
 fn test_skew() {
 	mut data := [10.0, 4.45, 5.9, 2.7]
 	mut o := stats.skew(data)
-	assert math.alike(o, 0.5754020379048158)
+	mut e := 0.5754021106320453
+	assert math.veryclose(o, e), diff(o, e)
 	data = [-3.0, 67.31, 4.4, 1.89]
 	o = stats.skew(data)
-	assert math.alike(o, 1.1248732608899568)
+	e = 1.1248733711136492
+	assert math.veryclose(o, e), diff(o, e)
 	data = [12.0, 7.88, 76.122, 54.83]
 	o = stats.skew(data)
-	assert math.alike(o, 0.19007917421924964)
+	e = 0.19007911706827735
+	assert math.alike(o, e), diff(o, e)
 
 	// test for int, i64, f32 array
 	assert stats.skew[int]([1, 2, 3, 1]) == 2
 	assert stats.skew[i64]([i64(1), 2, 3, 1]) == 2
 	o = stats.skew[f32]([f32(1.0), 3, 5, 7, 3])
-	assert math.alike(o, 0.2715454697608948)
+	e = 0.27154541015625
+	assert math.alike(o, e), diff(o, e)
 }
 
 fn test_quantile() {
 	// Assumes sorted array
 
 	mut data := [2.7, 4.45, 5.9, 10.0]
 	mut o := stats.quantile(data, 0.1)!
-	assert math.alike(o, 3.225000020861626)
+	assert math.alike(o, 3.225)
 	data = [-3.0, 1.89, 4.4, 67.31]
 	o = stats.quantile(data, 0.2)!
-	assert math.alike(o, -0.06599988341331486)
+	assert math.alike(o, -0.06599999999999961)
 	data = [7.88, 12.0, 54.83, 76.122]
 	o = stats.quantile(data, 0.3)!
-	assert math.alike(o, 11.587999901771546)
+	assert math.alike(o, 11.588)
 
 	stats.quantile(data, -0.3) or { assert err.msg() == 'index out of range' }
 

vlib/strconv/format.v

@@ -43,6 +43,22 @@ const dec_round = [
 	0.000000000000000005,
 	0.0000000000000000005,
 	0.00000000000000000005,
+	0.000000000000000000005,
+	0.0000000000000000000005,
+	0.00000000000000000000005,
+	0.000000000000000000000005,
+	0.0000000000000000000000005,
+	0.00000000000000000000000005,
+	0.000000000000000000000000005,
+	0.0000000000000000000000000005,
+	0.00000000000000000000000000005,
+	0.000000000000000000000000000005,
+	0.0000000000000000000000000000005,
+	0.00000000000000000000000000000005,
+	0.000000000000000000000000000000005,
+	0.0000000000000000000000000000000005,
+	0.00000000000000000000000000000000005,
+	0.000000000000000000000000000000000005,
 ]!
 
 // Single format functions

vlib/strconv/format_mem.c.v

@@ -209,7 +209,7 @@ pub fn f64_to_str_lnd1(f f64, dec_digit int) string {
 
 		// allocate exp+32 chars for the return string
 		// mut res := []u8{len:exp+32,init:`0`}
-		mut res := []u8{len: exp + 32, init: 0}
+		mut res := []u8{len: exp + 40, init: 0}
 		mut r_i := 0 // result string buffer index
 
 		// println("s:${sgn} b:${b[0]} es:${exp_sgn} exp:${exp}")

vlib/v/checker/assign.v

@@ -23,6 +23,12 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 	node.left_types = []
 	mut right_len := node.right.len
 	mut right_first_type := ast.void_type
+	old_recheck := c.inside_recheck
+	// check if we are rechecking an already checked expression on generic rechecking
+	c.inside_recheck = old_recheck || node.right_types.len > 0
+	defer {
+		c.inside_recheck = old_recheck
+	}
 	for i, mut right in node.right {
 		if right in [ast.CallExpr, ast.IfExpr, ast.LockExpr, ast.MatchExpr, ast.DumpExpr,
 			ast.SelectorExpr, ast.ParExpr, ast.ComptimeCall] {
@@ -37,7 +43,9 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 			}
 			right_type_sym := c.table.sym(right_type)
 			// fixed array returns an struct, but when assigning it must be the array type
-			right_type = c.cast_fixed_array_ret(right_type, right_type_sym)
+			if right_type_sym.info is ast.ArrayFixed {
+				right_type = c.cast_fixed_array_ret(right_type, right_type_sym)
+			}
 			if i == 0 {
 				right_first_type = right_type
 				node.right_types = [
@@ -62,11 +70,23 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 					}
 				}
 			}
-		}
-		if mut right is ast.InfixExpr {
+		} else if mut right is ast.InfixExpr {
 			if right.op == .arrow {
 				c.error('cannot use `<-` on the right-hand side of an assignment, as it does not return any values',
 					right.pos)
+			} else if c.inside_recheck {
+				mut right_type := c.expr(mut right)
+				right_type_sym := c.table.sym(right_type)
+				// fixed array returns an struct, but when assigning it must be the array type
+				if right_type_sym.info is ast.ArrayFixed {
+					right_type = c.cast_fixed_array_ret(right_type, right_type_sym)
+				}
+				if i == 0 {
+					right_first_type = right_type
+					node.right_types = [
+						c.check_expr_option_or_result_call(right, right_first_type),
+					]
+				}
 			}
 		}
 		if mut right is ast.Ident {
@@ -182,16 +202,13 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 				node.right_types << c.check_expr_option_or_result_call(node.right[i],
 					right_type)
 			}
-		} else {
+		} else if c.inside_recheck {
 			// on generic recheck phase it might be needed to resolve the rhs again
 			if i < node.right.len && c.comptime.has_comptime_expr(node.right[i]) {
 				mut expr := mut node.right[i]
-				old_inside_recheck := c.inside_recheck
-				c.inside_recheck = true
 				right_type := c.expr(mut expr)
 				node.right_types[i] = c.check_expr_option_or_result_call(node.right[i],
 					right_type)
-				c.inside_recheck = old_inside_recheck
 			}
 		}
 		mut right := if i < node.right.len { node.right[i] } else { node.right[0] }
@@ -393,6 +410,17 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 										left.obj.ct_type_var = .field_var
 										left.obj.typ = c.comptime.comptime_for_field_type
 									}
+								} else if mut right is ast.InfixExpr {
+									right_ct_var := c.comptime.get_ct_type_var(right.left)
+									if right_ct_var != .no_comptime {
+										left.obj.ct_type_var = right_ct_var
+									}
+								} else if mut right is ast.IndexExpr
+									&& c.comptime.is_comptime(right) {
+									right_ct_var := c.comptime.get_ct_type_var(right.left)
+									if right_ct_var != .no_comptime {
+										left.obj.ct_type_var = right_ct_var
+									}
 								} else if mut right is ast.Ident && right.obj is ast.Var
 									&& right.or_expr.kind == .absent {
 									right_obj_var := right.obj as ast.Var

vlib/v/gen/c/assign.v

@@ -371,6 +371,19 @@ fn (mut g Gen) assign_stmt(node_ ast.AssignStmt) {
 						left.obj.typ = var_type
 						g.assign_ct_type = var_type
 					}
+				} else if val is ast.InfixExpr && val.op in [.plus, .minus, .mul, .div, .mod]
+					&& g.comptime.is_comptime(val.left) {
+					ctyp := g.unwrap_generic(g.type_resolver.get_type(val.left))
+					if ctyp != ast.void_type {
+						ct_type_var := g.comptime.get_ct_type_var(val.left)
+						if ct_type_var in [.key_var, .value_var] {
+							g.type_resolver.update_ct_type(left.name, g.unwrap_generic(ctyp))
+						}
+						var_type = ctyp
+						val_type = var_type
+						left.obj.typ = var_type
+						g.assign_ct_type = var_type
+					}
 				}
 				is_auto_heap = left.obj.is_auto_heap
 			}

vlib/v/gen/c/infix.v

@@ -1188,8 +1188,10 @@ fn (mut g Gen) gen_plain_infix_expr(node ast.InfixExpr) {
 		&& node.op in [.plus, .minus, .mul, .div, .mod] && !(g.pref.translated
 		|| g.file.is_translated)
 	if needs_cast {
-		typ_str := if g.comptime.is_comptime(node.left) {
+		typ_str := if !node.left.is_literal() && g.comptime.is_comptime(node.left) {
 			g.styp(g.type_resolver.get_type_or_default(node.left, node.promoted_type))
+		} else if !node.right.is_literal() && g.comptime.is_comptime(node.right) {
+			g.styp(g.type_resolver.get_type_or_default(node.right, node.promoted_type))
 		} else {
 			g.styp(node.promoted_type)
 		}

vlib/v/tests/comptime/comptime_infix_assign_test.v

@@ -0,0 +1,62 @@
+enum Flag {
+	usa_old_glory
+	all_other_bad_excuses_for_a_flag
+}
+
+struct Test {
+	is_foo bool
+	name   [5]u8
+}
+
+fn enc[T](item T) string {
+	$if T is $int {
+		len := match typeof(item).name {
+			'i8', 'u8' { u8(2) }
+			'i16', 'u16' { 4 }
+			'int', 'u32', 'i32' { 8 }
+			'i64', 'u64' { 16 }
+			else { return '' }
+		}
+		return u64_to_hex(item, len)
+	} $else $if T is $array {
+		mut hex := ''
+		for val in item {
+			hex += enc(val)
+		}
+		return hex
+	} $else $if T is $struct {
+		mut hex := ''
+		$for field in T.fields {
+			hex += enc(item.$(field.name)) + '_'
+		}
+		return hex
+	} $else {
+		if typeof(item).name == 'bool' {
+			return enc(int(item))
+		}
+		$if debug {
+			println('cannot encode ${T}(s)')
+		}
+		return ''
+	}
+}
+
+@[direct_array_access; inline]
+fn u64_to_hex(nn u64, len u8) string {
+	mut n := nn
+	mut buf := [17]u8{}
+	buf[len] = 0
+	mut i := 0
+	for i = len - 1; i >= 0; i-- {
+		d := u8(n & 0xF)
+		buf[i] = if d < 10 { d + `0` } else { d + 87 }
+		n = n >> 4
+	}
+	return unsafe { tos(memdup(&buf[0], len + 1), len) }
+}
+
+fn test_main() {
+	assert enc(Test{}) == '00000000_0000000000_'
+	assert enc(Test{ is_foo: true }) == '00000001_0000000000_'
+	assert enc(Test{ name: [u8(1), 2, 3, 4, 5]! }) == '00000000_0102030405_'
+}

vlib/v/type_resolver/comptime_resolver.v

@@ -50,7 +50,11 @@ pub fn (t &ResolverInfo) is_comptime(node ast.Expr) bool {
 			return node.expr is ast.Ident && node.expr.ct_expr
 		}
 		ast.InfixExpr {
-			return t.is_comptime(node.left) || t.is_comptime(node.right)
+			if node.op in [.plus, .minus, .mul, .div, .mod] {
+				t.is_comptime(node.left) || t.is_comptime(node.right)
+			} else {
+				false
+			}
 		}
 		ast.ParExpr {
 			return t.is_comptime(node.expr)
@@ -76,6 +80,10 @@ pub fn (t &ResolverInfo) get_ct_type_var(node ast.Expr) ast.ComptimeVarKind {
 		}
 	} else if node is ast.IndexExpr {
 		return t.get_ct_type_var(node.left)
+	} else if node is ast.InfixExpr {
+		return t.get_ct_type_var(node.left)
+	} else if node is ast.ParExpr {
+		return t.get_ct_type_var(node.expr)
 	}
 	return .no_comptime
 }