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SubjectRe: [PATCH v3 3/5] sparc64: SPARC optimised fls function
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> On Oct 6, 2017, at 9:54 AM, Vijay Kumar <vijay.ac.kumar@oracle.com> wrote:
>
> Defined SPARC optimised fls using lzcnt opcode.
>
> Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
> ---
> 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..5ed7da9
> --- /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 <linux/linkage.h>
> +
> +#define LXCNT_O0_G2 \

Typo? Should be LZCNT_O0_G2.

Anthony

> + .word 0x85b002e8
> +
> + .text
> + .register %g2, #scratch
> + .register %g3, #scratch
> +
> +ENTRY(NG4fls)
> + LXCNT_O0_G2 !lzcnt %o0, %g2
> + mov 64, %g3
> + retl
> + sub %g3, %g2, %o0
> +ENDPROC(NG4fls)
> --
> 1.7.1
>
> --
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