On Wed, 2011-11-30 at 16:23 +1100, Tony Breeds wrote: > Code copied from arch/powerpc/kernel/misc_32.S > > Signed-off-by: Tony Breeds <t...@bakeyournoodle.com> > --- > arch/powerpc/boot/div64.S | 52 > +++++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 52 insertions(+), 0 deletions(-)
Should we just link with libgcc ? :-) Cheers, Ben. > diff --git a/arch/powerpc/boot/div64.S b/arch/powerpc/boot/div64.S > index d271ab5..bbcb8a4 100644 > --- a/arch/powerpc/boot/div64.S > +++ b/arch/powerpc/boot/div64.S > @@ -57,3 +57,55 @@ __div64_32: > stw r8,4(r3) > mr r3,r6 # return the remainder in r3 > blr > + > +/* > + * Extended precision shifts. > + * > + * Updated to be valid for shift counts from 0 to 63 inclusive. > + * -- Gabriel > + * > + * R3/R4 has 64 bit value > + * R5 has shift count > + * result in R3/R4 > + * > + * ashrdi3: arithmetic right shift (sign propagation) > + * lshrdi3: logical right shift > + * ashldi3: left shift > + */ > + .globl __ashrdi3 > +__ashrdi3: > + subfic r6,r5,32 > + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count > + addi r7,r5,32 # could be xori, or addi with -32 > + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) > + rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 > + sraw r7,r3,r7 # t2 = MSW >> (count-32) > + or r4,r4,r6 # LSW |= t1 > + slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 > + sraw r3,r3,r5 # MSW = MSW >> count > + or r4,r4,r7 # LSW |= t2 > + blr > + > + .globl __ashldi3 > +__ashldi3: > + subfic r6,r5,32 > + slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count > + addi r7,r5,32 # could be xori, or addi with -32 > + srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) > + slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) > + or r3,r3,r6 # MSW |= t1 > + slw r4,r4,r5 # LSW = LSW << count > + or r3,r3,r7 # MSW |= t2 > + blr > + > + .globl __lshrdi3 > +__lshrdi3: > + subfic r6,r5,32 > + srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count > + addi r7,r5,32 # could be xori, or addi with -32 > + slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) > + srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) > + or r4,r4,r6 # LSW |= t1 > + srw r3,r3,r5 # MSW = MSW >> count > + or r4,r4,r7 # LSW |= t2 > + blr _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
