| Line 30... |
Line 30... |
signal shift1L, shift2L, shift4L, shift8L, shift16L : std_logic_vector(31 downto 0);
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signal shift1L, shift2L, shift4L, shift8L, shift16L : std_logic_vector(31 downto 0);
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signal shift1R, shift2R, shift4R, shift8R, shift16R : std_logic_vector(31 downto 0);
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signal shift1R, shift2R, shift4R, shift8R, shift16R : std_logic_vector(31 downto 0);
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signal fills : std_logic_vector(31 downto 16);
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signal fills : std_logic_vector(31 downto 16);
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begin
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begin
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fills <= "1111111111111111" when shift_func = shift_right_signed and value(31) = '1' else
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fills <= "1111111111111111" when shift_func = SHIFT_RIGHT_SIGNED and value(31) = '1' else
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"0000000000000000";
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"0000000000000000";
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shift1L <= value(30 downto 0) & '0' when shift_amount(0) = '1' else value;
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shift1L <= value(30 downto 0) & '0' when shift_amount(0) = '1' else value;
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shift2L <= shift1L(29 downto 0) & "00" when shift_amount(1) = '1' else shift1L;
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shift2L <= shift1L(29 downto 0) & "00" when shift_amount(1) = '1' else shift1L;
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shift4L <= shift2L(27 downto 0) & "0000" when shift_amount(2) = '1' else shift2L;
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shift4L <= shift2L(27 downto 0) & "0000" when shift_amount(2) = '1' else shift2L;
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shift8L <= shift4L(23 downto 0) & "00000000" when shift_amount(3) = '1' else shift4L;
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shift8L <= shift4L(23 downto 0) & "00000000" when shift_amount(3) = '1' else shift4L;
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| Line 48... |
Line 48... |
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-- synthesis translate_off
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-- synthesis translate_off
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GENERIC_SHIFTER: if shifter_type = "GENERIC" generate
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GENERIC_SHIFTER: if shifter_type = "GENERIC" generate
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-- synthesis translate_on
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-- synthesis translate_on
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c_shift <= shift16L when shift_func = shift_left_unsigned else
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c_shift <= shift16L when shift_func = SHIFT_LEFT_UNSIGNED else
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shift16R when shift_func = shift_right_unsigned or shift_func = shift_right_signed else
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shift16R when shift_func = SHIFT_RIGHT_UNSIGNED or shift_func = SHIFT_RIGHT_SIGNED else
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ZERO;
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ZERO;
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-- synthesis translate_off
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-- synthesis translate_off
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end generate;
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end generate;
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-- synthesis translate_on
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-- synthesis translate_on
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-- synopsys synthesis_off
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-- synopsys synthesis_off
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AREA_OPTIMIZED_SHIFTER: if shifter_type = "AREA_OPTIMIZED" generate
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AREA_OPTIMIZED_SHIFTER: if shifter_type = "AREA_OPTIMIZED" generate
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c_shift <= shift16L when shift_func = shift_left_unsigned else (others => 'Z');
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c_shift <= shift16L when shift_func = SHIFT_LEFT_UNSIGNED else (others => 'Z');
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c_shift <= shift16R when shift_func = shift_right_unsigned or
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c_shift <= shift16R when shift_func = SHIFT_RIGHT_UNSIGNED or
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shift_func = shift_right_signed else (others => 'Z');
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shift_func = SHIFT_RIGHT_SIGNED else (others => 'Z');
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c_shift <= ZERO when shift_func = shift_nothing else (others => 'Z');
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c_shift <= ZERO when shift_func = SHIFT_NOTHING else (others => 'Z');
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end generate;
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end generate;
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-- synopsys synthesis_on
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-- synopsys synthesis_on
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