From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757766AbdJKSu1 (ORCPT ); Wed, 11 Oct 2017 14:50:27 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:49021 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753071AbdJKSuX (ORCPT ); Wed, 11 Oct 2017 14:50:23 -0400 From: Vijay Kumar 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 3/5] sparc64: SPARC optimized fls function Date: Wed, 11 Oct 2017 12:50:04 -0600 Message-Id: <1507747806-10251-4-git-send-email-vijay.ac.kumar@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com> References: <1507747806-10251-1-git-send-email-vijay.ac.kumar@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Defined SPARC optimized fls using lzcnt opcode. Signed-off-by: Vijay Kumar --- arch/sparc/lib/Makefile | 1 + arch/sparc/lib/NG4fls.S | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+), 0 deletions(-) diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile index 5380c59..2823b8e 100644 --- a/arch/sparc/lib/Makefile +++ b/arch/sparc/lib/Makefile @@ -18,6 +18,7 @@ lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o lib-$(CONFIG_SPARC64) += multi3.o lib-$(CONFIG_SPARC64) += fls.o lib-$(CONFIG_SPARC64) += fls64.o +obj-$(CONFIG_SPARC64) += NG4fls.o lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o diff --git a/arch/sparc/lib/NG4fls.S b/arch/sparc/lib/NG4fls.S new file mode 100644 index 0000000..bc17b65 --- /dev/null +++ b/arch/sparc/lib/NG4fls.S @@ -0,0 +1,20 @@ +/* NG4fls.S: SPARC optimized fls and __fls for T4 and above. + * + * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. + */ + +#include + +#define LZCNT_O0_G2 \ + .word 0x85b002e8 + + .text + .register %g2, #scratch + .register %g3, #scratch + +ENTRY(NG4fls) + LZCNT_O0_G2 !lzcnt %o0, %g2 + mov 64, %g3 + retl + sub %g3, %g2, %o0 +ENDPROC(NG4fls) -- 1.7.1