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microwatt/divider_tb.vhdl

554 lines
22 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.decode_types.all;
use work.common.all;
use work.glibc_random.all;
use work.ppc_fx_insns.all;
entity divider_tb is
end divider_tb;
architecture behave of divider_tb is
signal clk : std_ulogic;
signal rst : std_ulogic;
constant clk_period : time := 10 ns;
signal d1 : Execute1ToDividerType;
signal d2 : DividerToExecute1Type;
begin
divider_0: entity work.divider
port map (clk => clk, rst => rst, d_in => d1, d_out => d2);
clk_process: process
begin
clk <= '0';
wait for clk_period/2;
clk <= '1';
wait for clk_period/2;
end process;
stim_process: process
variable ra, rb, rt, behave_rt: std_ulogic_vector(63 downto 0);
variable si: std_ulogic_vector(15 downto 0);
variable d128: std_ulogic_vector(127 downto 0);
variable q128: std_ulogic_vector(127 downto 0);
4 years ago
variable q64: std_ulogic_vector(63 downto 0);
variable rem32: std_ulogic_vector(31 downto 0);
begin
rst <= '1';
wait for clk_period;
rst <= '0';
d1.valid <= '1';
d1.dividend <= x"0000000010001000";
d1.divisor <= x"0000000000001111";
d1.is_signed <= '0';
d1.is_32bit <= '0';
d1.is_extended <= '0';
d1.is_modulus <= '0';
d1.neg_result <= '0';
wait for clk_period;
assert d2.valid = '0';
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
assert d2.write_reg_data = x"000000000000f001" report "result " & to_hstring(d2.write_reg_data);
wait for clk_period;
assert d2.valid = '0' report "valid";
d1.valid <= '1';
wait for clk_period;
assert d2.valid = '0' report "valid";
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
assert d2.write_reg_data = x"000000000000f001" report "result " & to_hstring(d2.write_reg_data);
wait for clk_period;
assert d2.valid = '0';
-- test divd
report "test divd";
divd_loop : for dlength in 1 to 8 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63) xor rb(63);
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" and (ra /= x"8000000000000000" or rb /= x"ffffffffffffffff") then
behave_rt := ppc_divd(ra, rb);
end if;
4 years ago
assert to_hstring(behave_rt) = to_hstring(d2.write_reg_data)
report "bad divd expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test divdu
report "test divdu";
divdu_loop : for dlength in 1 to 8 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
behave_rt := ppc_divdu(ra, rb);
end if;
4 years ago
assert to_hstring(behave_rt) = to_hstring(d2.write_reg_data)
report "bad divdu expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test divde
report "test divde";
divde_loop : for vlength in 1 to 8 loop
for dlength in 1 to vlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63) xor rb(63);
d1.is_extended <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
d128 := ra & x"0000000000000000";
q128 := std_ulogic_vector(signed(d128) / signed(rb));
if q128(127 downto 63) = x"0000000000000000" & '0' or
q128(127 downto 63) = x"ffffffffffffffff" & '1' then
behave_rt := q128(63 downto 0);
end if;
end if;
4 years ago
assert to_hstring(behave_rt) = to_hstring(d2.write_reg_data)
report "bad divde expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data) & " for ra = " & to_hstring(ra) & " rb = " & to_hstring(rb);
end loop;
end loop;
end loop;
-- test divdeu
report "test divdeu";
divdeu_loop : for vlength in 1 to 8 loop
for dlength in 1 to vlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.is_extended <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if unsigned(rb) > unsigned(ra) then
d128 := ra & x"0000000000000000";
q128 := std_ulogic_vector(unsigned(d128) / unsigned(rb));
behave_rt := q128(63 downto 0);
end if;
4 years ago
assert to_hstring(behave_rt) = to_hstring(d2.write_reg_data)
report "bad divdeu expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data) & " for ra = " & to_hstring(ra) & " rb = " & to_hstring(rb);
end loop;
end loop;
end loop;
-- test divw
report "test divw";
divw_loop : for dlength in 1 to 4 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63) xor rb(63);
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" and (ra /= x"ffffffff80000000" or rb /= x"ffffffffffffffff") then
behave_rt := ppc_divw(ra, rb);
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad divw expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test divwu
report "test divwu";
divwu_loop : for dlength in 1 to 4 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
behave_rt := ppc_divwu(ra, rb);
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad divwu expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test divwe
report "test divwe";
divwe_loop : for vlength in 1 to 4 loop
for dlength in 1 to vlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 32)) & x"00000000";
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63) xor rb(63);
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
4 years ago
q64 := std_ulogic_vector(signed(ra) / signed(rb));
if q64(63 downto 31) = x"00000000" & '0' or
q64(63 downto 31) = x"ffffffff" & '1' then
behave_rt := x"00000000" & q64(31 downto 0);
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad divwe expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data) & " for ra = " & to_hstring(ra) & " rb = " & to_hstring(rb);
end if;
end loop;
end loop;
end loop;
-- test divweu
report "test divweu";
divweu_loop : for vlength in 1 to 4 loop
for dlength in 1 to vlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 32)) & x"00000000";
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if unsigned(rb(31 downto 0)) > unsigned(ra(63 downto 32)) then
behave_rt := std_ulogic_vector(unsigned(ra) / unsigned(rb));
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad divweu expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data) & " for ra = " & to_hstring(ra) & " rb = " & to_hstring(rb);
end loop;
end loop;
end loop;
-- test modsd
report "test modsd";
modsd_loop : for dlength in 1 to 8 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63);
d1.is_extended <= '0';
d1.is_32bit <= '0';
d1.is_modulus <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
behave_rt := std_ulogic_vector(signed(ra) rem signed(rb));
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad modsd expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test modud
report "test modud";
modud_loop : for dlength in 1 to 8 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.is_extended <= '0';
d1.is_32bit <= '0';
d1.is_modulus <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
behave_rt := std_ulogic_vector(unsigned(ra) rem unsigned(rb));
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad modud expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test modsw
report "test modsw";
modsw_loop : for dlength in 1 to 4 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(signed(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(signed(pseudorand(vlength * 8)), 64));
d1.dividend <= ra when ra(63) = '0' else std_ulogic_vector(- signed(ra));
d1.divisor <= rb when rb(63) = '0' else std_ulogic_vector(- signed(rb));
d1.is_signed <= '1';
d1.neg_result <= ra(63);
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.is_modulus <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
4 years ago
rem32 := std_ulogic_vector(signed(ra(31 downto 0)) rem signed(rb(31 downto 0)));
if rem32(31) = '0' then
behave_rt := x"00000000" & rem32;
else
behave_rt := x"ffffffff" & rem32;
end if;
end if;
4 years ago
assert behave_rt = d2.write_reg_data
report "bad modsw expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
-- test moduw
report "test moduw";
moduw_loop : for dlength in 1 to 4 loop
for vlength in 1 to dlength loop
for i in 0 to 100 loop
ra := std_ulogic_vector(resize(unsigned(pseudorand(dlength * 8)), 64));
rb := std_ulogic_vector(resize(unsigned(pseudorand(vlength * 8)), 64));
d1.dividend <= ra;
d1.divisor <= rb;
d1.is_signed <= '0';
d1.neg_result <= '0';
d1.is_extended <= '0';
d1.is_32bit <= '1';
d1.is_modulus <= '1';
d1.valid <= '1';
wait for clk_period;
d1.valid <= '0';
4 years ago
for j in 0 to 66 loop
wait for clk_period;
if d2.valid = '1' then
exit;
end if;
end loop;
assert d2.valid = '1';
4 years ago
behave_rt := (others => '0');
if rb /= x"0000000000000000" then
behave_rt := x"00000000" & std_ulogic_vector(unsigned(ra(31 downto 0)) rem unsigned(rb(31 downto 0)));
end if;
4 years ago
assert behave_rt(31 downto 0) = d2.write_reg_data(31 downto 0)
report "bad moduw expected " & to_hstring(behave_rt) & " got " & to_hstring(d2.write_reg_data);
end loop;
end loop;
end loop;
assert false report "end of test" severity failure;
wait;
end process;
end behave;