Value range propogation applied incorrectly.

[dlangBugzillaToGithub]

gordon.freeman.sullied reported this on 2014-10-18T17:49:00Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=13634

Description

long a = 0;
long b = 9223372036854775807;
	
a = cast(double) b;
writeln(b);
writeln(a);


The results are:
b = 9223372036854775807
a = -9223372036854775808

This should not be possible.

[dlangBugzillaToGithub]

gordon.freeman.sullied commented on 2014-10-18T17:52:14Z

In the case of a large negative or positive value stored in a long, an intermediate double will not fully store it, therefore this should not be possible without more explicit means.