ppc_fx_insns.vhdl

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

library work;
use work.helpers.all;

package ppc_fx_insns is
        function ppc_addi (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_addis (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_add (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_subf (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_neg (ra: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_addic (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_adde (ra, rb: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector;
        function ppc_subfic (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_subfc (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_subfe (ra, rb: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector;
        function ppc_addze (ra: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector;

        function ppc_andi (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_andis (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_ori (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_oris (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_xori (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_xoris (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_and (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_xor (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_nand (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_or (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_nor (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_andc (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_eqv (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_orc (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_extsb (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_extsh (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_extsw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_cntlzw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_cnttzw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_cntlzd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_cnttzd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_popcntb (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_popcntw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_popcntd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_prtyd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_prtyw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_rlwinm (rs: std_ulogic_vector(63 downto 0); sh, mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector;
        function ppc_rlwnm (rs, rb: std_ulogic_vector(63 downto 0); mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector;
        function ppc_rlwimi (ra, rs: std_ulogic_vector(63 downto 0); sh, mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector;
        function ppc_rldicl (rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_rldicr (rs: std_ulogic_vector(63 downto 0); sh, me: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_rldic (rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_rldcl (rs, rb: std_ulogic_vector(63 downto 0); mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_rldcr (rs, rb: std_ulogic_vector(63 downto 0); me: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_rldimi (ra, rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;

        function ppc_slw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_srw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_srawi (rs : std_ulogic_vector(63 downto 0); sh: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_sraw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_sld (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_srd (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_sradi (rs: std_ulogic_vector(63 downto 0); sh: std_ulogic_vector(5 downto 0)) return std_ulogic_vector;
        function ppc_srad (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_mulld (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_mulhd (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_mulhdu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_mulli (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
        function ppc_mullw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_mulhw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_mulhwu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
                           so: std_ulogic) return std_ulogic_vector;
        function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
                           so: std_ulogic) return std_ulogic_vector;
        function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
                           so: std_ulogic) return std_ulogic_vector;
        function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
                           so: std_ulogic) return std_ulogic_vector;

        function ppc_cmpb (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_cmpeqb (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_cmprb (ra, rb: std_ulogic_vector(63 downto 0); l: std_ulogic) return std_ulogic_vector;

        function ppc_divw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_divdu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_divd (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
        function ppc_divwu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

        function ppc_bc_taken(bo, bi: std_ulogic_vector(4 downto 0); cr: std_ulogic_vector(31 downto 0); ctr: std_ulogic_vector(63 downto 0)) return std_ulogic;
end package ppc_fx_insns;

package body ppc_fx_insns is
        function ppc_addi (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(signed(ra) + signed(si));
        end;

        function ppc_addic (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return std_logic_vector(resize(unsigned(ra), 65) + unsigned(resize(signed(si), 64)));
        end;

        function ppc_adde (ra, rb: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector is
        begin
                return std_logic_vector(resize(unsigned(ra), 65) + resize(unsigned(rb), 65) + carry);
        end;

        function ppc_subfic (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return std_logic_vector(unsigned(resize(signed(si), 64)) + resize(unsigned(not(ra)), 65) + 1);
        end;

        function ppc_subfc (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_logic_vector(resize(unsigned(rb), 65) + resize(unsigned(not(ra)), 65) + 1);
        end;

        function ppc_subfe (ra, rb: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector is
        begin
                return std_logic_vector(resize(unsigned(rb), 65) + resize(unsigned(not(ra)), 65) + carry);
        end;

        function ppc_addze (ra: std_ulogic_vector(63 downto 0); carry: std_ulogic) return std_ulogic_vector is
        begin
                return std_logic_vector(resize(unsigned(ra), 65) + carry);
        end;

        function ppc_addis (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(signed(ra) + shift_left(resize(signed(si), 32), 16));
        end;

        function ppc_add (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(signed(ra) + signed(rb));
        end;

        function ppc_subf (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(signed(rb) - signed(ra));
        end;

        function ppc_neg (ra: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(-signed(ra));
        end;

        function ppc_andi (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs and std_ulogic_vector(resize(unsigned(ui), 64));
        end;

        function ppc_andis (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs and std_ulogic_vector(shift_left(resize(unsigned(ui), 64), 16));
        end;

        function ppc_ori (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs or std_ulogic_vector(resize(unsigned(ui), 64));
        end;

        function ppc_oris (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs or std_ulogic_vector(shift_left(resize(unsigned(ui), 64), 16));
        end;

        function ppc_xori (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs xor std_ulogic_vector(resize(unsigned(ui), 64));
        end;

        function ppc_xoris (rs: std_ulogic_vector(63 downto 0); ui: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
        begin
                return rs xor std_ulogic_vector(shift_left(resize(unsigned(ui), 64), 16));
        end;

        function ppc_and (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs and rb;
        end;

        function ppc_xor (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs xor rb;
        end;

        function ppc_nand (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs nand rb;
        end;

        function ppc_or (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs or rb;
        end;

        function ppc_nor (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs nor rb;
        end;

        function ppc_andc (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs and not(rb);
        end;

        function ppc_eqv (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return not(rs xor rb);
        end;

        function ppc_orc (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return rs or not(rb);
        end;

        function ppc_extsb (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(resize(signed(rs(7 downto 0)), rs'length));
        end;

        function ppc_extsh (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(resize(signed(rs(15 downto 0)), rs'length));
        end;

        function ppc_extsw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(resize(signed(rs(31 downto 0)), rs'length));
        end;

        function ppc_cntlzw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(to_unsigned(fls_32(rs(31 downto 0)), rs'length));
        end;

        function ppc_cnttzw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(to_unsigned(ffs_32(rs(31 downto 0)), rs'length));
        end;

        function ppc_cntlzd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(to_unsigned(fls_64(rs), rs'length));
        end;

        function ppc_cnttzd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(to_unsigned(ffs_64(rs), rs'length));
        end;

        function ppc_popcntb (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable ret: std_ulogic_vector (rs'range);
                variable hi: integer;
                variable lo: integer;
        begin
                ret := (others => '0');

                for i in 1 to 8 loop
                        hi := (8*i)-1;
                        lo := 8*(i-1);
                        ret(hi downto lo) := popcnt8(rs(hi downto lo));
                end loop;

                return ret;
        end;

        function ppc_popcntw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable ret: std_ulogic_vector (rs'range);
                variable hi: integer;
                variable lo: integer;
        begin
                ret := (others => '0');

                for i in 1 to 2 loop
                        hi := (32*i)-1;
                        lo := 32*(i-1);
                        ret(hi downto lo) := popcnt32(rs(hi downto lo));
                end loop;

                return ret;
        end;

        function ppc_popcntd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return popcnt64(rs);
        end;

        function ppc_prtyd (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp : std_ulogic;
                variable ret : std_ulogic_vector(63 downto 0);
        begin
                ret := (others => '0');

                tmp := '0';
                for i in 0 to 7 loop
                        tmp := tmp xor rs(i*8);
                end loop;

                ret(0) := tmp;
                return ret;
        end;

        function ppc_prtyw (rs: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp : std_ulogic;
                variable ret : std_ulogic_vector(63 downto 0);
        begin
                ret := (others => '0');

                tmp := '0';
                for i in 0 to 3 loop
                        tmp := tmp xor rs(i*8);
                end loop;
                ret(0) := tmp;

                tmp := '0';
                for i in 4 to 7 loop
                        tmp := tmp xor rs(i*8);
                end loop;
                ret(32) := tmp;

                return ret;
        end;

        function ppc_rlwinm (rs: std_ulogic_vector(63 downto 0); sh, mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector is
                variable hi, lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                hi := 31 - to_integer(unsigned(mb));
                lo := 31 - to_integer(unsigned(me));
                tmp1 := rs(31 downto 0) & rs(31 downto 0);
                tmp1 := std_ulogic_vector(rotate_left(unsigned(tmp1), to_integer(unsigned(sh))));
                tmp2 := (others => '0');
                if hi < lo then
                        -- Mask wraps around
                        for i in 0 to 63 loop
                                if i <= hi or i >= lo then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                else
                        for i in 0 to 63 loop
                                if i >= lo and i <= hi then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                end if;
                return tmp2;
        end;

        function ppc_rlwnm (rs, rb: std_ulogic_vector(63 downto 0); mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector is
                variable hi, lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
                variable n : integer;
        begin
                hi := 31 - to_integer(unsigned(mb));
                lo := 31 - to_integer(unsigned(me));
                n := to_integer(unsigned(rb(4 downto 0)));
                tmp1 := rs(31 downto 0) & rs(31 downto 0);
                tmp1 := std_ulogic_vector(rotate_left(unsigned(tmp1), n));
                tmp2 := (others => '0');
                if hi < lo then
                        -- Mask wraps around
                        for i in 0 to 63 loop
                                if i <= hi or i >= lo then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                else
                        for i in 0 to 63 loop
                                if i >= lo and i <= hi then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                end if;
                return tmp2;
        end;

        function ppc_rlwimi (ra, rs: std_ulogic_vector(63 downto 0); sh, mb, me: std_ulogic_vector(4 downto 0)) return std_ulogic_vector is
                variable hi, lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                hi := 31 - to_integer(unsigned(mb));
                lo := 31 - to_integer(unsigned(me));
                tmp1 := rs(31 downto 0) & rs(31 downto 0);
                tmp1 := std_ulogic_vector(rotate_left(unsigned(tmp1), to_integer(unsigned(sh))));
                tmp2 := ra;
                if hi < lo then
                        -- Mask wraps around
                        for i in 0 to 63 loop
                                if i <= hi or i >= lo then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                else
                        for i in 0 to 63 loop
                                if i >= lo and i <= hi then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                end if;
                return tmp2;
        end;

        function ppc_rldicl (rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable hi : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                hi := 63-to_integer(unsigned(mb));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), to_integer(unsigned(sh))));
                tmp2 := (others => '0');
                for i in 0 to 63 loop
                        if i <= hi then
                                tmp2(i) := tmp1(i);
                        end if;
                end loop;
                return tmp2;
        end;

        function ppc_rldicr (rs: std_ulogic_vector(63 downto 0); sh, me: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                lo := 63-to_integer(unsigned(me));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), to_integer(unsigned(sh))));
                tmp2 := (others => '0');
                for i in 0 to 63 loop
                        if i >= lo then
                                tmp2(i) := tmp1(i);
                        end if;
                end loop;
                return tmp2;
        end;

        function ppc_rldic (rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable hi, lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                hi := 63-to_integer(unsigned(mb));
                lo := to_integer(unsigned(sh));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), to_integer(unsigned(sh))));
                tmp2 := (others => '0');
                if hi < lo then
                        -- Mask wraps around
                        for i in 0 to 63 loop
                                if i <= hi or i >= lo then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                else
                        for i in 0 to 63 loop
                                if i >= lo and i <= hi then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                end if;
                return tmp2;
        end;

        function ppc_rldcl (rs, rb: std_ulogic_vector(63 downto 0); mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable hi : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                hi := 63-to_integer(unsigned(mb));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), to_integer(unsigned(rb(5 downto 0)))));
                tmp2 := (others => '0');
                for i in 0 to 63 loop
                        if i <= hi then
                                tmp2(i) := tmp1(i);
                        end if;
                end loop;
                return tmp2;
        end;

        function ppc_rldcr (rs, rb: std_ulogic_vector(63 downto 0); me: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(63 downto 0);
        begin
                lo := 63-to_integer(unsigned(me));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), to_integer(unsigned(rb(5 downto 0)))));
                tmp2 := (others => '0');
                for i in 0 to 63 loop
                        if i >= lo then
                                tmp2(i) := tmp1(i);
                        end if;
                end loop;
                return tmp2;
        end;

        function ppc_rldimi (ra, rs: std_ulogic_vector(63 downto 0); sh, mb: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable hi, lo : integer;
                variable tmp1, tmp2 : std_ulogic_vector(rs'range);
        begin
                hi := 63-to_integer(unsigned(mb));
                lo := to_integer(unsigned(sh));
                tmp1 := std_ulogic_vector(rotate_left(unsigned(rs), lo));
                tmp2 := ra;
                if hi < lo then
                        -- Mask wraps around
                        for i in 0 to 63 loop
                                if i <= hi or i >= lo then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                else
                        for i in 0 to 63 loop
                                if i >= lo and i <= hi then
                                        tmp2(i) := tmp1(i);
                                end if;
                        end loop;
                end if;
                return tmp2;
        end;

        function ppc_slw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : integer;
                variable tmp : unsigned(31 downto 0);
        begin
                n := to_integer(unsigned(rb(5 downto 0)));
                tmp := shift_left(unsigned(rs(31 downto 0)), n);

                return (63 downto 32 => '0') & std_ulogic_vector(tmp);
        end;

        function ppc_srw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : integer;
                variable tmp : unsigned(31 downto 0);
        begin
                n := to_integer(unsigned(rb(5 downto 0)));
                tmp := shift_right(unsigned(rs(31 downto 0)), n);

                return (63 downto 32 => '0') & std_ulogic_vector(tmp);
        end;

        function ppc_srawi (rs : std_ulogic_vector(63 downto 0); sh: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable n : integer;
                variable tmp : signed(31 downto 0);
                variable mask : std_ulogic_vector(63 downto 0);
                variable carry: std_ulogic;
        begin
                n := to_integer(unsigned(sh));
                tmp := shift_right(signed(rs(31 downto 0)), n);
                -- what about n = 0?
                mask := (others => '0');
                for i in 0 to 63 loop
                        if i < n then
                                mask(i) := '1';
                        end if;
                end loop;
                carry := '0' when (rs and mask) = (63 downto 0 => '0') else rs(31);

                return carry & std_ulogic_vector(resize(tmp, rs'length));
        end;

        function ppc_sraw (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : natural;
                variable tmp : signed(31 downto 0);
                variable mask : std_ulogic_vector(63 downto 0);
                variable carry: std_ulogic;
        begin
                n := to_integer(unsigned(rb(5 downto 0)));
                tmp := shift_right(signed(rs(31 downto 0)), n);
                -- what about n = 0?
                mask := (others => '0');
                for i in 0 to 63 loop
                        if i < n then
                                mask(i) := '1';
                        end if;
                end loop;
                carry := or (rs and mask) and rs(31);
                return carry & std_ulogic_vector(resize(tmp, rs'length));
        end;

        function ppc_sld (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : integer;
        begin
                n := to_integer(unsigned(rb(6 downto 0)));
                return std_ulogic_vector(shift_left(unsigned(rs), n));
        end;

        function ppc_srd (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : integer;
        begin
                n := to_integer(unsigned(rb(6 downto 0)));
                return std_ulogic_vector(shift_right(unsigned(rs), n));
        end;

        function ppc_sradi (rs: std_ulogic_vector(63 downto 0); sh: std_ulogic_vector(5 downto 0)) return std_ulogic_vector is
                variable n : integer;
                variable carry: std_ulogic;
                variable mask : std_ulogic_vector(63 downto 0);
        begin
                n := to_integer(unsigned(sh));
                -- what about n = 0?
                mask := (others => '0');
                for i in 0 to 63 loop
                        if i < n then
                                mask(i) := '1';
                        end if;
                end loop;
                carry := '0' when (rs and mask) = (63 downto 0 => '0') else rs(63);

                return carry & std_ulogic_vector(shift_right(signed(rs), n));
        end;

        function ppc_srad (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable n : integer;
                variable carry: std_ulogic;
                variable mask : std_ulogic_vector(63 downto 0);
        begin
                n := to_integer(unsigned(rb(6 downto 0)));
                -- what about n = 0?
                mask := (others => '0');
                for i in 0 to 63 loop
                        if i < n then
                                mask(i) := '1';
                        end if;
                end loop;
                carry := '0' when (rs and mask) = (63 downto 0 => '0') else rs(63);

                return carry & std_ulogic_vector(shift_right(signed(rs), n));
        end;

        -- Not sure how to better communicate the top 64 bits of the result is unused
        function ppc_mulld (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: signed(127 downto 0);
        begin
                tmp := signed(ra) * signed(rb);
                return std_ulogic_vector(tmp(63 downto 0));
        end;

        -- Not sure how to better communicate the top 64 bits of the result is unused
        function ppc_mulhd (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: signed(127 downto 0);
        begin
                tmp := signed(ra) * signed(rb);
                return std_ulogic_vector(tmp(127 downto 64));
        end;

        -- Not sure how to better communicate the top 64 bits of the result is unused
        function ppc_mulhdu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: unsigned(127 downto 0);
        begin
                tmp := unsigned(ra) * unsigned(rb);
                return std_ulogic_vector(tmp(127 downto 64));
        end;

        -- Not sure how to better communicate the top 16 bits of the result is unused
        function ppc_mulli (ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
                variable tmp: signed(79 downto 0);
        begin
                tmp := signed(ra) * signed(si);
                return std_ulogic_vector(tmp(63 downto 0));
        end;

        function ppc_mullw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
        begin
                return std_ulogic_vector(signed(ra(31 downto 0)) * signed(rb(31 downto 0)));
        end;

        function ppc_mulhw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: signed(63 downto 0);
        begin
                tmp := signed(ra(31 downto 0)) * signed(rb(31 downto 0));
                return std_ulogic_vector(tmp(63 downto 32)) & std_ulogic_vector(tmp(63 downto 32));
        end;

        function ppc_mulhwu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: unsigned(63 downto 0);
        begin
                tmp := unsigned(ra(31 downto 0)) * unsigned(rb(31 downto 0));
                return std_ulogic_vector(tmp(63 downto 32)) & std_ulogic_vector(tmp(63 downto 32));
        end;

        function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
                           so: std_ulogic) return std_ulogic_vector is
                variable tmp: signed(ra'range);
        begin
                tmp := signed(ra);
                if l = '0' then
                        tmp := resize(signed(ra(31 downto 0)), tmp'length);
                end if;

                return ppc_signed_compare(tmp, resize(signed(si), tmp'length), so);
        end;

        function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
                          so: std_ulogic) return std_ulogic_vector is
                variable tmpa, tmpb: signed(ra'range);
        begin
                tmpa := signed(ra);
                tmpb := signed(rb);
                if l = '0' then
                        tmpa := resize(signed(ra(31 downto 0)), ra'length);
                        tmpb := resize(signed(rb(31 downto 0)), ra'length);
                end if;

                return ppc_signed_compare(tmpa, tmpb, so);
        end;

        function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
                            so: std_ulogic) return std_ulogic_vector is
                variable tmp: unsigned(ra'range);
        begin
                tmp := unsigned(ra);
                if l = '0' then
                        tmp := resize(unsigned(ra(31 downto 0)), tmp'length);
                end if;

                return ppc_unsigned_compare(tmp, resize(unsigned(si), tmp'length), so);
        end;

        function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
                           so: std_ulogic) return std_ulogic_vector is
                variable tmpa, tmpb: unsigned(ra'range);
        begin
                tmpa := unsigned(ra);
                tmpb := unsigned(rb);
                if l = '0' then
                        tmpa := resize(unsigned(ra(31 downto 0)), ra'length);
                        tmpb := resize(unsigned(rb(31 downto 0)), ra'length);
                end if;

                return ppc_unsigned_compare(tmpa, tmpb, so);
        end;

        function ppc_cmpb (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable ret: std_ulogic_vector (rs'range);
                variable hi: integer;
                variable lo: integer;
        begin
                for i in 1 to 8 loop
                        hi := (8*i)-1;
                        lo := 8*(i-1);
                        ret(hi downto lo) := cmp_one_byte(rs(hi downto lo), rb(hi downto lo));
                end loop;

                return ret;
        end;

        function ppc_cmpeqb (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
            variable match: std_ulogic;
            variable j: integer;
        begin
            match := '0';
            for i in 0 to 7 loop
                j := i * 8;
                if ra(7 downto 0) = rb(j + 7 downto j) then
                    match := '1';
                end if;
            end loop;
            return '0' & match & "00";
        end;

        function ppc_cmprb (ra, rb: std_ulogic_vector(63 downto 0); l: std_ulogic) return std_ulogic_vector is
            variable match: std_ulogic;
            variable v: unsigned(7 downto 0);
        begin
            match := '0';
            v := unsigned(ra(7 downto 0));
            if v >= unsigned(rb(7 downto 0)) and v <= unsigned(rb(15 downto 8)) then
                match := '1';
            elsif l = '1' and v >= unsigned(rb(23 downto 16)) and v <= unsigned(rb(31 downto 24)) then
                match := '1';
            end if;
            return '0' & match & "00";
        end;

        -- Not synthesizable
        function ppc_divw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: signed(31 downto 0);
        begin
                tmp := signed(ra(31 downto 0)) / signed(rb(31 downto 0));

                return (63 downto 32 => '0') & std_ulogic_vector(tmp);
        end;

        function ppc_divdu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: unsigned(63 downto 0) := (others => '0');
        begin
                if unsigned(rb) /= 0 then
                        tmp := unsigned(ra) / unsigned(rb);
                end if;

                return std_ulogic_vector(tmp);
        end;

        function ppc_divd (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: signed(63 downto 0) := (others => '0');
        begin
                if signed(rb) /= 0 then
                        tmp := signed(ra) / signed(rb);
                end if;

                return std_ulogic_vector(tmp);
        end;

        function ppc_divwu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
                variable tmp: unsigned(31 downto 0) := (others => '0');
        begin
                if unsigned(rb(31 downto 0)) /= 0 then
                        tmp := unsigned(ra(31 downto 0)) / unsigned(rb(31 downto 0));
                end if;

                return std_ulogic_vector(resize(tmp, ra'length));
        end;

        function ppc_bc_taken(bo, bi: std_ulogic_vector(4 downto 0); cr: std_ulogic_vector(31 downto 0); ctr: std_ulogic_vector(63 downto 0)) return std_ulogic is
                variable crfield: integer;
                variable crbit_match: std_ulogic;
                variable ctr_not_zero: std_ulogic;
                variable ctr_ok: std_ulogic;
                variable cond_ok: std_ulogic;
        begin
                crfield := to_integer(unsigned(bi));
                -- BE bit numbering
                crbit_match := '1' when cr(31-crfield) = bo(4-1) else '0';
                -- We check this before it is decremented
                ctr_not_zero := '1' when ctr /= x"0000000000000001" else '0';
                ctr_ok := bo(4-2) or (ctr_not_zero xor bo(4-3));
                cond_ok := bo(4-0) or crbit_match;
                return ctr_ok and cond_ok;
        end;

end package body ppc_fx_insns;