https://issues.dlang.org/show_bug.cgi?id=13023
Issue ID: 13023
Summary: optimizer produces wrong code for comparision and
division of ulong
Product: D
Version: D2
Hardware: x86_64
OS: Linux
Status: NEW
Severity: major
Priority: P1
Component: DMD
Assignee: [email protected]
Reporter: [email protected]
The following code fails when compiling with -O on a 64-bit system. Note that
the problem does not appear when removing the writefln() or not passing n as a
parameter. Using long instead of ulong solves the problem as well.
import std.stdio;
void foo(ulong n)
{
ulong k = 0;
writefln("%s", k>=n/2); // correctly print 'false'
if(k>=n/2) // triggers with -O
assert(false);
}
void main()
{
ulong n = (1UL<<32)*2;
foo(n);
}
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