From: Vijay Kumar <vijay.ac.kumar@oracle.com>
To: davem@davemloft.net
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
babu.moger@oracle.com, rob.gardner@oracle.com, sam@ravnborg.org,
anthony.yznaga@oracle.com
Subject: [PATCH v4 4/5] sparc64: SPARC optimized __fls function
Date: Wed, 11 Oct 2017 12:50:05 -0600 [thread overview]
Message-ID: <1507747806-10251-5-git-send-email-vijay.ac.kumar@oracle.com> (raw)
In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com>
Defined SPARC optimized __fls using lzcnt opcode.
Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
---
arch/sparc/lib/NG4fls.S | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/arch/sparc/lib/NG4fls.S b/arch/sparc/lib/NG4fls.S
index bc17b65..2d0991e 100644
--- a/arch/sparc/lib/NG4fls.S
+++ b/arch/sparc/lib/NG4fls.S
@@ -18,3 +18,13 @@ ENTRY(NG4fls)
retl
sub %g3, %g2, %o0
ENDPROC(NG4fls)
+
+ENTRY(__NG4fls)
+ brz,pn %o0, 1f
+ LZCNT_O0_G2 !lzcnt %o0, %g2
+ mov 63, %g3
+ sub %g3, %g2, %o0
+1:
+ retl
+ nop
+ENDPROC(__NG4fls)
--
1.7.1
next prev parent reply other threads:[~2017-10-11 18:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 18:50 [PATCH v4 0/5] sparc64: Optimize fls and __fls Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 1/5] sparc64: Define SPARC default fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 2/5] sparc64: Define SPARC default __fls function Vijay Kumar
2017-10-11 18:50 ` [PATCH v4 3/5] sparc64: SPARC optimized fls function Vijay Kumar
2017-10-11 18:50 ` Vijay Kumar [this message]
2017-10-11 18:50 ` [PATCH v4 5/5] sparc64: Use sparc optimized fls and __fls for T4 and above Vijay Kumar
2017-10-12 20:29 ` [PATCH v4 0/5] sparc64: Optimize fls and __fls Babu Moger
2017-11-15 5:27 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1507747806-10251-5-git-send-email-vijay.ac.kumar@oracle.com \
--to=vijay.ac.kumar@oracle.com \
--cc=anthony.yznaga@oracle.com \
--cc=babu.moger@oracle.com \
--cc=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=rob.gardner@oracle.com \
--cc=sam@ravnborg.org \
--cc=sparclinux@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®