topic Trace cache and self-modifying code in Software Archive

Trace cache and self-modifying code

dm71 — Fri, 07 Oct 2005 14:46:47 GMT

IA-32 Software Developer's Manual says:

For the Pentium 4 and Intel Xeon processors, a write or a snoop of an instruction in a code segment, where the target instruction is already decoded and resident in the trace cache, invalidates the entire trace cache.

Does every executed instruction get into the trace cache? If an instruction, which was executed only once but very recently, is modified, will that invalidate the trace cache?

Does this also mean that if code is read as data, the trace cache can be invalidated?

Are algorithms used by trace cache in Intel's processors described anywhere?

Thanks

Re: Trace cache and self-modifying code

Intel_Software_Netw1 — Fri, 07 Oct 2005 23:08:22 GMT

Greetings from Intel Software Network Support. We are forwarding your question to our engineering contacts, and will let you know how they respond.

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Lexi S.
Intel Software Network Support
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Re: Trace cache and self-modifying code

Intel_Software_Netw1 — Wed, 12 Oct 2005 06:53:52 GMT

Greetings from Intel Software Network Support. You are asking for details that may be covered under NDA. Feel free to send yourquestion directly to Intel Software NetworkSupportthrough the support linklisted below, and we will be sure to get you a timely answer to your questions.

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Message Edited by intel.software.network.support on 11-15-2005 11:09 PM