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Re: [RFC] Don't schedule prefetch INSNs
- From: Adam Nemet <anemet at caviumnetworks dot com>
- To: "Andreas Krebbel" <krebbel at linux dot vnet dot ibm dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 19 May 2009 11:50:27 -0700
- Subject: Re: [RFC] Don't schedule prefetch INSNs
- References: <20090519152104.GA19937@bart>
"Andreas Krebbel" <krebbel@linux.vnet.ibm.com> writes:
> I'm experimenting with prefetching instructions in the S/390 back-end
> and found it rather annoying that the instruction scheduler shuffles
> them around.
Do you mean this within the same basic block? Prefetching something that will
be accessed in the same basic block is probably not very profitable (unless
the block is huge).
Adam