[Issue 10301] New: Loops for 64 bit code should be aligned on 8 byte boundaries

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10301

           Summary: Loops for 64 bit code should be aligned on 8 byte
                    boundaries
           Product: D
           Version: D1 & D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bugzilla at digitalmars.com


--- Comment #0 from Walter Bright <bugzilla at digitalmars.com> 2013-06-08 10:36:27 PDT ---
Juan Manual Cabo reports a substantial speedup for such with this code:
------------
    import std.stdio;
    import std.datetime;

    int fibw(int n) { //Linear Fibonacci
        int a = 1;
        int b = 1;
        for (int i=2; i <= n; ++i) {
            int sum = a + b;
            a = b;
            b = sum;
        }
        return b;
    }

    void main() {
        auto start = Clock.currTime();
        int r = fibw(1000_000_000);
        auto elapsed = Clock.currTime() - start;
        writeln(r);
        writeln(elapsed);
    }
----------------

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