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| /* fls64.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)
| mov -1, %g2
| sllx %g2, 32, %g2
| and %o0, %g2, %g2
| brnz,pt %g2, 1f
| mov 63, %g1
| sllx %o0, 32, %o0
| mov 31, %g1
| 1:
| mov -1, %g2
| sllx %g2, 48, %g2
| and %o0, %g2, %g2
| brnz,pt %g2, 2f
| mov -1, %g2
| sllx %o0, 16, %o0
| add %g1, -16, %g1
| 2:
| mov -1, %g2
| sllx %g2, 56, %g2
| and %o0, %g2, %g2
| brnz,pt %g2, 3f
| mov -1, %g2
| sllx %o0, 8, %o0
| add %g1, -8, %g1
| 3:
| sllx %g2, 60, %g2
| and %o0, %g2, %g2
| brnz,pt %g2, 4f
| mov -1, %g2
| sllx %o0, 4, %o0
| add %g1, -4, %g1
| 4:
| sllx %g2, 62, %g2
| and %o0, %g2, %g2
| brnz,pt %g2, 5f
| mov -1, %g3
| sllx %o0, 2, %o0
| add %g1, -2, %g1
| 5:
| mov 0, %g2
| sllx %g3, 63, %g3
| and %o0, %g3, %o0
| movre %o0, 1, %g2
| sub %g1, %g2, %g1
| jmp %o7+8
| sra %g1, 0, %o0
| ENDPROC(__fls)
| EXPORT_SYMBOL(__fls)
|
|
