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microwatt/ppc_fx_insns.vhdl

830 lines
29 KiB
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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_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 integer;
function ppc_bcctr_taken(bo, bi: std_ulogic_vector(4 downto 0); cr: std_ulogic_vector(31 downto 0)) return integer;
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;
-- 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 integer 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;
variable ret: integer;
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;
if ctr_ok = '1' and cond_ok = '1' then
ret := 1;
else
ret := 0;
end if;
return ret;
end;
function ppc_bcctr_taken(bo, bi: std_ulogic_vector(4 downto 0); cr: std_ulogic_vector(31 downto 0)) return integer is
variable crfield: integer;
variable crbit_match: std_ulogic;
variable cond_ok: std_ulogic;
variable ret: integer;
begin
crfield := to_integer(unsigned(bi));
-- BE bit numbering
crbit_match := '1' when cr(31-crfield) = bo(4-1) else '0';
cond_ok := bo(4-0) or crbit_match;
if cond_ok = '1' then
ret := 1;
else
ret := 0;
end if;
return ret;
end;
end package body ppc_fx_insns;
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