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Bug 2812 – sqrt(2.0) is about -2.7341e-53

Status: RESOLVED
Resolution: FIXED
Severity: regression
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: x86
OS: Linux
Creation time: 2009-04-06T14:09:00Z
Last change time: 2015-06-09T05:14:56Z
Assigned to: bugzilla
Creator: andrei

Comments

Comment #0 by andrei — 2009-04-06T14:09:30Z

import std.math, std.stdio; void main() { double x = sqrt(2.0); writeln(x); } prints -2.7341e-53

Comment #1 by clugdbug — 2009-04-06T14:15:25Z

Confirmed. Crucial information missing: on Windows at least, this is only with -O. dmd -run bug.d 1.41421 dmd -run -O bug.d -2.7341e-53 I'm raising this to regression.

Comment #2 by dsimcha — 2009-04-06T14:19:16Z

Yes. Also, this seems to happen only for sqrt(double) not sqrt(float) or sqrt(real).

Comment #3 by clugdbug — 2009-04-07T02:08:12Z

Not so. float x = sqrt(2.0f); is also wrong. It only affects compile-time constants: double y = 2.0; double x = sqrt(y); works correctly.

Comment #4 by bugzilla — 2009-04-08T00:26:40Z

Fixed dmd 2.028