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| /* fls.S: SPARC default fls definition.
| *
| * SPARC default fls definition, which follows the same algorithm as
| * in generic fls(). This function will be boot time patched on T4
| * and onward.
| */
|
| #include <linux/linkage.h>
| #include <asm/export.h>
|
| .text
| .register %g2, #scratch
| .register %g3, #scratch
| ENTRY(fls)
| brz,pn %o0, 6f
| mov 0, %o1
| sethi %hi(0xffff0000), %g3
| mov %o0, %g2
| andcc %o0, %g3, %g0
| be,pt %icc, 8f
| mov 32, %o1
| sethi %hi(0xff000000), %g3
| andcc %g2, %g3, %g0
| bne,pt %icc, 3f
| sethi %hi(0xf0000000), %g3
| sll %o0, 8, %o0
| 1:
| add %o1, -8, %o1
| sra %o0, 0, %o0
| mov %o0, %g2
| 2:
| sethi %hi(0xf0000000), %g3
| 3:
| andcc %g2, %g3, %g0
| bne,pt %icc, 4f
| sethi %hi(0xc0000000), %g3
| sll %o0, 4, %o0
| add %o1, -4, %o1
| sra %o0, 0, %o0
| mov %o0, %g2
| 4:
| andcc %g2, %g3, %g0
| be,a,pt %icc, 7f
| sll %o0, 2, %o0
| 5:
| xnor %g0, %o0, %o0
| srl %o0, 31, %o0
| sub %o1, %o0, %o1
| 6:
| jmp %o7 + 8
| sra %o1, 0, %o0
| 7:
| add %o1, -2, %o1
| ba,pt %xcc, 5b
| sra %o0, 0, %o0
| 8:
| sll %o0, 16, %o0
| sethi %hi(0xff000000), %g3
| sra %o0, 0, %o0
| mov %o0, %g2
| andcc %g2, %g3, %g0
| bne,pt %icc, 2b
| mov 16, %o1
| ba,pt %xcc, 1b
| sll %o0, 8, %o0
| ENDPROC(fls)
| EXPORT_SYMBOL(fls)
|
|
