diff options
Diffstat (limited to 'kernel/arch/sparc/lib/ffs.S')
| -rw-r--r-- | kernel/arch/sparc/lib/ffs.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/kernel/arch/sparc/lib/ffs.S b/kernel/arch/sparc/lib/ffs.S new file mode 100644 index 000000000..b39389f69 --- /dev/null +++ b/kernel/arch/sparc/lib/ffs.S @@ -0,0 +1,84 @@ +#include <linux/linkage.h> + + .register %g2,#scratch + + .text + .align 32 + +ENTRY(ffs) + brnz,pt %o0, 1f + mov 1, %o1 + retl + clr %o0 + nop + nop +ENTRY(__ffs) + sllx %o0, 32, %g1 /* 1 */ + srlx %o0, 32, %g2 + + clr %o1 /* 2 */ + movrz %g1, %g2, %o0 + + movrz %g1, 32, %o1 /* 3 */ +1: clr %o2 + + sllx %o0, (64 - 16), %g1 /* 4 */ + srlx %o0, 16, %g2 + + movrz %g1, %g2, %o0 /* 5 */ + clr %o3 + + movrz %g1, 16, %o2 /* 6 */ + clr %o4 + + and %o0, 0xff, %g1 /* 7 */ + srlx %o0, 8, %g2 + + movrz %g1, %g2, %o0 /* 8 */ + clr %o5 + + movrz %g1, 8, %o3 /* 9 */ + add %o2, %o1, %o2 + + and %o0, 0xf, %g1 /* 10 */ + srlx %o0, 4, %g2 + + movrz %g1, %g2, %o0 /* 11 */ + add %o2, %o3, %o2 + + movrz %g1, 4, %o4 /* 12 */ + + and %o0, 0x3, %g1 /* 13 */ + srlx %o0, 2, %g2 + + movrz %g1, %g2, %o0 /* 14 */ + add %o2, %o4, %o2 + + movrz %g1, 2, %o5 /* 15 */ + + and %o0, 0x1, %g1 /* 16 */ + + add %o2, %o5, %o2 /* 17 */ + xor %g1, 0x1, %g1 + + retl /* 18 */ + add %o2, %g1, %o0 +ENDPROC(ffs) +ENDPROC(__ffs) + + .section .popc_6insn_patch, "ax" + .word ffs + brz,pn %o0, 98f + neg %o0, %g1 + xnor %o0, %g1, %o1 + popc %o1, %o0 +98: retl + nop + .word __ffs + neg %o0, %g1 + xnor %o0, %g1, %o1 + popc %o1, %o0 + retl + sub %o0, 1, %o0 + nop + .previous |