Re: [libre-riscv-dev] Introduction and Questions
authorStaf Verhaegen <staf@fibraservi.eu>
Sat, 16 May 2020 09:47:27 +0000 (11:47 +0200)
committerlibre-riscv-dev <libre-riscv-dev@lists.libre-riscv.org>
Sat, 16 May 2020 09:47:29 +0000 (10:47 +0100)
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+From: Staf Verhaegen <staf@fibraservi.eu>
+To: libre-riscv-dev@lists.libre-riscv.org
+Date: Sat, 16 May 2020 11:47:27 +0200
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+Subject: Re: [libre-riscv-dev] Introduction and Questions
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+Jeremy Singher schreef op vr 15-05-2020 om 16:49 [-0700]:
+>=20
+> >=20
+> > sigh over a year ago i understood this enough to be able to answer.
+> > what we will have to do is simply ignore the optimisation opportunity.
+>=20
+>=20
+> Hmmm, ignoring WAW will significantly limit the ability of the core to
+> exploit ILP, which is one of the fundamental reasons for going OOO.
+
+I've wondered about this myself. Can you give concrete example of where
+not supporting a WAW hazard blocks ILP ?
+I am asking because just a WAW hazard could be easily avoided by a good
+peep hole optimizer in software because it would see that the output of
+the first write is never used.
+
+greets,
+Staf.
+
+
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