| Line 72... |
Line 72... |
variable answer_temp : std_logic_vector(31 downto 0);
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variable answer_temp : std_logic_vector(31 downto 0);
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variable start : std_logic;
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variable start : std_logic;
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variable do_write : std_logic;
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variable do_write : std_logic;
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variable do_hi : std_logic;
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variable do_hi : std_logic;
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variable sign_extend : std_logic;
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variable sign_extend : std_logic;
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variable a_neg : std_logic_vector(31 downto 0);
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variable b_neg : std_logic_vector(31 downto 0);
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begin
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begin
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do_mult_temp := do_mult_reg;
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do_mult_temp := do_mult_reg;
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do_signed_temp := do_signed_reg;
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do_signed_temp := do_signed_reg;
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count_temp := count_reg;
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count_temp := count_reg;
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| Line 101... |
Line 103... |
do_mult_temp := '1';
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do_mult_temp := '1';
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do_signed_temp := '0';
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do_signed_temp := '0';
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when mult_signed_mult =>
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when mult_signed_mult =>
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start := '1';
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start := '1';
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do_mult_temp := '1';
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do_mult_temp := '1';
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do_signed_temp := a(31) xor b(31);
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do_signed_temp := '1';
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when mult_divide =>
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when mult_divide =>
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start := '1';
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start := '1';
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do_mult_temp := '0';
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do_mult_temp := '0';
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do_signed_temp := '0';
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do_signed_temp := '0';
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when mult_signed_divide =>
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when mult_signed_divide =>
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| Line 116... |
Line 118... |
end case;
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end case;
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if start = '1' then
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if start = '1' then
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count_temp := "000000";
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count_temp := "000000";
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answer_temp := ZERO;
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answer_temp := ZERO;
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a_neg := bv_negate(a);
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b_neg := bv_negate(b);
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if do_mult_temp = '0' then
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if do_mult_temp = '0' then
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b_temp(63) := '0';
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b_temp(63) := '0';
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if mult_func /= mult_signed_divide or b(31) = '0' then
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b_temp(62 downto 31) := b;
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else
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b_temp(62 downto 31) := bv_negate(b);
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end if;
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if mult_func /= mult_signed_divide or a(31) = '0' then
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if mult_func /= mult_signed_divide or a(31) = '0' then
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a_temp := a;
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a_temp := a;
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else
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else
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a_temp := bv_negate(a);
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a_temp := a_neg;
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end if;
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if mult_func /= mult_signed_divide or b(31) = '0' then
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b_temp(62 downto 31) := b;
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else
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b_temp(62 downto 31) := b_neg;
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end if;
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end if;
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b_temp(30 downto 0) := ZERO(30 downto 0);
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b_temp(30 downto 0) := ZERO(30 downto 0);
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else --multiply
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else --multiply
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if do_signed_temp = '0' or b(31) = '0' then
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a_temp := a;
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a_temp := a;
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b_temp := ZERO & b;
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b_temp(31 downto 0) := b;
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else
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a_temp := a_neg;
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b_temp(31 downto 0) := b_neg;
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end if;
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b_temp(63 downto 32) := ZERO;
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end if;
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end if;
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elsif do_write = '1' then
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elsif do_write = '1' then
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if do_hi = '0' then
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if do_hi = '0' then
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b_temp(31 downto 0) := a;
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b_temp(31 downto 0) := a;
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else
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else
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| Line 203... |
Line 213... |
count_reg <= count_temp;
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count_reg <= count_temp;
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reg_a <= a_temp;
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reg_a <= a_temp;
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reg_b <= b_temp;
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reg_b <= b_temp;
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answer_reg <= answer_temp;
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answer_reg <= answer_temp;
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if start = '1' then
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if start = '1' then
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reg_a_times3 <= ((a(31) and do_signed_temp) & a & '0') +
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reg_a_times3 <= ((a_temp(31) and do_signed_temp) & a_temp & '0') +
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((a(31) and do_signed_temp) & (a(31) and do_signed_temp) & a);
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((a_temp(31) and do_signed_temp) & (a_temp(31) and do_signed_temp) & a_temp);
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end if;
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end if;
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end if;
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end if;
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if count_reg(5) = '0' and mult_func/= mult_nothing and start = '0' then
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if count_reg(5) = '0' and mult_func/= mult_nothing and start = '0' then
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pause_out <= '1';
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pause_out <= '1';
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