[Issue 360] New: Compile-time floating-point calculations are sometimes inconsistent

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=360

           Summary: Compile-time floating-point calculations are sometimes
                    inconsistent
           Product: D
           Version: 0.167
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: digitalmars-com at baysmith.com


The following code should print false before it exits.

import std.stdio;

void main() {
        const float STEP_SIZE = 0.2f;


        float j = 0.0f;
        while (j <= ( 1.0f / STEP_SIZE)) {
                j += 1.0f;
                writefln(j <= ( 1.0f / STEP_SIZE));
        }

}

This problem does not occur when:
1. the code is optimized
2. STEP_SIZE is not a const
3. STEP_SIZE is a real


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