mirror of
https://github.com/golang/go
synced 2024-07-21 01:55:06 +00:00
3663a437a7
Floating-point constants are represented as rational numbers when possible (i.e., when numerators and denominators are not too large). If we convert to floats when not necessary, we risk losing precision. This is the minimal fix for the specific issue, but it's too aggressive: If the numbers are too large, we still want to convert to floats. Will address in a separate CL that also does a few related cleanups. Fixes #43908. Change-Id: Id575e34fa18361a347c43701cfb4dd7221997f66 Reviewed-on: https://go-review.googlesource.com/c/go/+/286552 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org>
22 lines
473 B
Go
22 lines
473 B
Go
// run
|
|
|
|
// Copyright 2021 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.
|
|
|
|
// Verify exact constant evaluation independent of
|
|
// (mathematically equivalent) expression form.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
const ulp1 = imag(1i + 2i / 3 - 5i / 3)
|
|
const ulp2 = imag(1i + complex(0, 2) / 3 - 5i / 3)
|
|
|
|
func main() {
|
|
if ulp1 != ulp2 {
|
|
panic(fmt.Sprintf("%g != %g\n", ulp1, ulp2))
|
|
}
|
|
}
|