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Date:	Fri, 6 Jun 2025 04:49:12 -0400
To:	Jeremy Drake <cygwin AT jdrake DOT com>
Cc:	cygwin AT cygwin DOT com
Subject:	Re: instruction cache flushing in Cygwin
Message-ID:	<aEKriMYj44cbkdIO@xps13>
References:	<c2da7fdd-08f3-006b-9ff8-7270d5010bc4 AT jdrake DOT com>
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From:	Glenn Strauss via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Glenn Strauss <gs-cygwin DOT com AT gluelogic DOT com>
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On Thu, Jun 05, 2025 at 11:33:18PM -0700, Jeremy Drake via Cygwin wrote:
> I noticed while looking at JIT test failures in LLVM that they don't have
> an implementation for Cygwin for flushing the instruction cache.  I don't
> see any Cygwin function calling FlushInstructionCache, is there some
> POSIXy function for this?  I don't really want to have to include Windows
> headers just to get FlushInstructionCache and GetCurrentProcess, risking
> pulling in a lot of extra definitions.

Do you need something specific to Cygwin, or something that is specific
to CPU-architecture?  GCC and Clang both have __builtin___clear_cache()
intrinsic (yes, with all those underscores)

Cheers, Glenn

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