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<TITLE> [Mono-bugs] [Bug 487846] New: PPC code gen is inefficient in several areas
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<H1>[Mono-bugs] [Bug 487846] New: PPC code gen is inefficient in several areas</H1>
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<B>bugzilla_noreply at novell.com</B>
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<A HREF="mailto:mono-bugs%40lists.ximian.com?Subject=%5BMono-bugs%5D%20%5BBug%20487846%5D%20New%3A%20PPC%20code%20gen%20is%20inefficient%20in%0A%09several%20areas&In-Reply-To="
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TITLE="[Mono-bugs] [Bug 487846] New: PPC code gen is inefficient in several areas">bugzilla_noreply at novell.com
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<I>Mon Mar 23 12:51:10 EDT 2009</I>
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<PRE><A HREF="https://bugzilla.novell.com/show_bug.cgi?id=487846">https://bugzilla.novell.com/show_bug.cgi?id=487846</A>
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Summary: PPC code gen is inefficient in several areas
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Classification: Mono
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Product: Mono: Runtime
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Version: SVN
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Platform: PowerPC-64
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OS/Version: openSUSE 10.3
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Status: NEW
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Severity: Normal
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Priority: P5 - None
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Component: JIT
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AssignedTo: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">lupus at novell.com</A>
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ReportedBy: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">munroesj at us.ibm.com</A>
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QAContact: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at lists.ximian.com</A>
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Found By: ---
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User-Agent: Mozilla/5.0 (X11; U; Linux ppc64; en-US; rv:1.8.1.19)
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Gecko/20081213 SUSE/2.0.0.19-0.3 Firefox/2.0.0.19
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The current implementation generated inefficient core for local calls and
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adresses in general
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For example a non-virtual call to another method in the same compile unit will
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use the:
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lis,ori,mtlr,blrl sequence when it should be a simple PC relative bl
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instruction in most case. It is much worse in PPC64 where the lis, ori, sldi,
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oris, ori, mtlr, blrl is used.
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This bad for several reasons. The ppc_load_sequence is a dependent sequence
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which does not support super-scalar execution. Also the blrl is likely to be
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mispredicted as generating the same sequence in multiple sites will pollute the
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link stack.
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Reproducible: Always
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Steps to Reproduce:
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1. mono -v -v
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2. look at the generated code
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3.
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--
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Configure bugmail: <A HREF="https://bugzilla.novell.com/userprefs.cgi?tab=email">https://bugzilla.novell.com/userprefs.cgi?tab=email</A>
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------- You are receiving this mail because: -------
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You are the QA contact for the bug.
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</PRE>
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