projects
/
libreriscv.git
/ commitdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
| commitdiff |
tree
raw
|
patch
|
inline
| side by side (parent:
a1de471
)
(no commit message)
author
lkcl
<lkcl@web>
Wed, 11 Sep 2019 13:57:23 +0000
(14:57 +0100)
committer
IkiWiki
<ikiwiki.info>
Wed, 11 Sep 2019 13:57:23 +0000
(14:57 +0100)
zfpacc_proposal.mdwn
patch
|
blob
|
history
diff --git
a/zfpacc_proposal.mdwn
b/zfpacc_proposal.mdwn
index 4f2aea2fdcceaac4c8b7346a63c6aa3249df2fd1..2e21c0740c3bdec9693edabfbc39077876828e12 100644
(file)
--- a/
zfpacc_proposal.mdwn
+++ b/
zfpacc_proposal.mdwn
@@
-7,6
+7,7
@@
TODO: complete writeup
Zfpacc: a proposal to allow implementations to dynamically set the bit-accuracy
of results, trading speed (reduced latency) for accuracy (higher latency).
Zfpacc: a proposal to allow implementations to dynamically set the bit-accuracy
of results, trading speed (reduced latency) for accuracy (higher latency).
+IEE754 format is preserved: only ULP (Unit in Last Place) is permitted to be non-zero.
# Extension of FCSR
# Extension of FCSR
@@
-86,6
+87,8
@@
The values for the field facc to include the following:
| 0b100 | Vulkan | Vulkan compliant |
| 0b110 | Appx | Machine Learning |
| 0b100 | Vulkan | Vulkan compliant |
| 0b110 | Appx | Machine Learning |
+Note that 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.
+
maybe a solution would be to add an extra field to the fp control csr
to allow selecting one of several accurate or fast modes:
maybe a solution would be to add an extra field to the fp control csr
to allow selecting one of several accurate or fast modes: