| Line 61... |
Line 61... |
clk_i : in std_ulogic; -- global clock, rising edge
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clk_i : in std_ulogic; -- global clock, rising edge
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rstn_i : in std_ulogic; -- global reset, low-active, async
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rstn_i : in std_ulogic; -- global reset, low-active, async
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ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus
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ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus
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start_i : in std_ulogic; -- trigger operation
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start_i : in std_ulogic; -- trigger operation
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-- data input --
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-- data input --
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frm_i : in std_ulogic_vector(2 downto 0); -- rounding mode
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cmp_i : in std_ulogic_vector(1 downto 0); -- comparator status
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cmp_i : in std_ulogic_vector(1 downto 0); -- comparator status
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rs1_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 1
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rs1_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 1
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rs2_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 2
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rs2_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 2
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-- result and status --
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-- result and status --
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res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- operation result
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res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- operation result
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| Line 365... |
Line 364... |
funct_ff <= cmd.funct; -- actual operation to execute
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funct_ff <= cmd.funct; -- actual operation to execute
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cmp_ff <= cmp_i; -- main ALU comparator
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cmp_ff <= cmp_i; -- main ALU comparator
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-- rounding mode --
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-- rounding mode --
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-- TODO / FIXME "round to nearest, ties to max magnitude" (0b100) is not supported yet
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-- TODO / FIXME "round to nearest, ties to max magnitude" (0b100) is not supported yet
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if (ctrl_i(ctrl_ir_funct3_2_c downto ctrl_ir_funct3_0_c) = "111") then
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if (ctrl_i(ctrl_ir_funct3_2_c downto ctrl_ir_funct3_0_c) = "111") then
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fpu_operands.frm <= '0' & frm_i(1 downto 0);
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fpu_operands.frm <= '0' & ctrl_i(ctrl_alu_frm1_c downto ctrl_alu_frm0_c);
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else
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else
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fpu_operands.frm <= '0' & ctrl_i(ctrl_ir_funct3_1_c downto ctrl_ir_funct3_0_c);
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fpu_operands.frm <= '0' & ctrl_i(ctrl_ir_funct3_1_c downto ctrl_ir_funct3_0_c);
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end if;
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end if;
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--
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--
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if (start_i = '1') then
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if (start_i = '1') then
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| Line 503... |
Line 502... |
fu_compare.flags <= (others => '0'); -- does not generate exceptions here, but normalizer can generate exceptions
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fu_compare.flags <= (others => '0'); -- does not generate exceptions here, but normalizer can generate exceptions
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-- Min/Max Select (FMIN/FMAX) -------------------------------------------------------------
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-- Min/Max Select (FMIN/FMAX) -------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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min_max_select: process(fpu_operands, comp_less_ff, fpu_operands, fu_compare, ctrl_i)
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min_max_select: process(fpu_operands, comp_less_ff, fu_compare, ctrl_i)
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variable cond_v : std_ulogic_vector(2 downto 0);
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variable cond_v : std_ulogic_vector(2 downto 0);
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begin
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begin
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-- comparison restul - check for special cases: -0 is less than +0
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-- comparison restul - check for special cases: -0 is less than +0
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if ((fpu_operands.rs1_class(fp_class_neg_zero_c) = '1') and (fpu_operands.rs2_class(fp_class_pos_zero_c) = '1')) then
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if ((fpu_operands.rs1_class(fp_class_neg_zero_c) = '1') and (fpu_operands.rs2_class(fp_class_pos_zero_c) = '1')) then
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cond_v(0) := ctrl_i(ctrl_ir_funct3_0_c);
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cond_v(0) := ctrl_i(ctrl_ir_funct3_0_c);
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