From 70cbec0c53739e170ea9c418e740f007ab5bca52 Mon Sep 17 00:00:00 2001 From: Vijay Kumar Date: Wed, 11 Oct 2017 12:50:04 -0600 Subject: sparc64: SPARC optimized fls function Defined SPARC optimized fls using lzcnt opcode. Signed-off-by: Vijay Kumar Signed-off-by: David S. Miller --- arch/sparc/lib/Makefile | 1 + arch/sparc/lib/NG4fls.S | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) create mode 100644 arch/sparc/lib/NG4fls.S (limited to 'arch/sparc/lib') diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile index 5380c5985420..2823b8e530ed 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 000000000000..bc17b65f1052 --- /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) -- cgit v1.2.3