linux_dsm_epyc7002/arch/sparc/lib/NG4fls.S

/* 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 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)

ENTRY(__NG4fls)
	brz,pn	%o0, 1f
	LZCNT_O0_G2	!lzcnt	%o0, %g2
	mov	63, %g3
	sub	%g3, %g2, %o0
1:
	retl
	 nop
ENDPROC(__NG4fls)
sparc64: SPARC optimized fls function Defined SPARC optimized fls using lzcnt opcode. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> 2017-10-12 01:50:04 +07:00			`/* 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 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)`
sparc64: SPARC optimized __fls function Defined SPARC optimized __fls using lzcnt opcode. Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> 2017-10-12 01:50:05 +07:00
			`ENTRY(__NG4fls)`
			`brz,pn %o0, 1f`
			`LZCNT_O0_G2 !lzcnt %o0, %g2`
			`mov 63, %g3`
			`sub %g3, %g2, %o0`
			`1:`
			`retl`
			`nop`
			`ENDPROC(__NG4fls)`