From: lkcl <lkcl@web>
Date: Wed, 11 Sep 2019 21:10:20 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~4097
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=aa82145b977c17f6d2f876582a9a30d7a1e53cca;p=libreriscv.git

---

diff --git a/zfpacc_proposal.mdwn b/zfpacc_proposal.mdwn
index c2b642ed0..eb2723575 100644
--- a/zfpacc_proposal.mdwn
+++ b/zfpacc_proposal.mdwn
@@ -91,9 +91,13 @@ The values for the field facc to include the following:
 | 0b100 | Vulkan  | Vulkan compliant    | 
 | 0b110 | Appx    | Machine Learning    
 
-Note that the format of the operands and result remain the same for
+Notes: 
+
+* facc=0 to match current RISC-V behaviour, where these bits were formerly reserved and set to zero.
+* The format of the operands and result remain the same for
 all opcodes. The only change is in the *accuracy* of the result, not
 its format.
+* facc sets the *minimum* accuracy. It is acceptable to provide *more* accurate results than is requested by a given facc mode (although, clearly, the opportunity for reduced power and latency would be missed).
 
 ## Discussion