| /* 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/export.h> | |
| #include <linux/linkage.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) |