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test/fixedbugs/issue7740.go
35 строк
736 B
Matthew Dempsky
[dev.regabi] cmd/compile: enable rational constant arithmetic
25 янв 2021, 21:53
25 янв 2021, 21:53
6a4739c
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// run // Copyright 2015 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // This test computes the precision of the compiler's internal multiprecision floats. package main import ( "fmt" "math" "runtime" ) const ulp = (1.0 + (2.0 / 3.0)) - (5.0 / 3.0) func main() { // adjust precision depending on compiler var prec float64 switch runtime.Compiler { case "gc": prec = math.Inf(1) // exact precision using rational arithmetic case "gccgo": prec = 256 default: // unknown compiler return } p := 1 - math.Log(math.Abs(ulp))/math.Log(2) if math.Abs(p-prec) > 1e-10 { fmt.Printf("BUG: got %g; want %g\n", p, prec) } }