[Mono-bugs] [Bug 555596] New: properties on structs possibly not being inlined

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sat Nov 14 22:31:31 EST 2009


           Summary: properties on structs possibly not being inlined
    Classification: Mono
           Product: MonoTouch
           Version: unspecified
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Runtime
        AssignedTo: gnorton at novell.com
        ReportedBy: matt.e.greer at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

--- Comment #0 from Matt Greer <matt.e.greer at gmail.com> 2009-11-15 03:31:22 UTC ---
Created an attachment (id=327570)
small benchmark showing diff between PointF and equivalent struct

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US;
rv: Gecko/2009101600 Firefox/3.0.15

I wrote a tiny, non-scientific benchmark that suggests the X and Y properties
on System.Drawing.PointF might not be inlined. I am getting worse performance
with PointF than I am doing the same calculations with a struct that has public
x and y fields.

Reproducible: Always

Steps to Reproduce:
1. Run the attached code on a phone or the simulator

It will report back that the Vector2F struct has better performance than

I talked with Geoff Norton in #monotouch and he thought it's possibly a bug
with the inliner, and asked me to file this.
Actual Results:  
Vertex2F gets roughly 2x better performance than PointF when accessing X and Y

Expected Results:  
They should be about the same.

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