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https://github.com/antonblanchard/microwatt.git
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5e140298a5
The decode2 stage was spaghetti code and needed cleaning up. Create a series of functions to pull fields from a ppc instruction and also a series of helpers to extract values for the execution units. As suggested by Paul, we should pass all signals to the execution units and only set the valid signal conditionally, which should use less resources. Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
164 lines
5.1 KiB
VHDL
164 lines
5.1 KiB
VHDL
library ieee;
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use ieee.std_logic_1164.all;
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package insn_helpers is
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function insn_rs (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_rt (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_ra (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_rb (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_si (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_ui (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_l (insn_in : std_ulogic_vector) return std_ulogic;
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function insn_sh32 (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_mb32 (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_me32 (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_li (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_lk (insn_in : std_ulogic_vector) return std_ulogic;
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function insn_rc (insn_in : std_ulogic_vector) return std_ulogic;
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function insn_bd (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_bf (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_fxm (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_bo (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_bi (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_bh (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_d (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_ds (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_to (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_bc (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_sh (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_me (insn_in : std_ulogic_vector) return std_ulogic_vector;
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function insn_mb (insn_in : std_ulogic_vector) return std_ulogic_vector;
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end package insn_helpers;
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package body insn_helpers is
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function insn_rs (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 21);
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end;
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function insn_rt (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 21);
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end;
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function insn_ra (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(20 downto 16);
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end;
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function insn_rb (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 11);
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end;
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function insn_si (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 0);
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end;
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function insn_ui (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 0);
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end;
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function insn_l (insn_in : std_ulogic_vector) return std_ulogic is
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begin
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return insn_in(21);
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end;
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function insn_sh32 (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 11);
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end;
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function insn_mb32 (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(10 downto 6);
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end;
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function insn_me32 (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(5 downto 1);
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end;
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function insn_li (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 2);
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end;
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function insn_lk (insn_in : std_ulogic_vector) return std_ulogic is
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begin
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return insn_in(0);
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end;
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function insn_rc (insn_in : std_ulogic_vector) return std_ulogic is
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begin
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return insn_in(0);
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end;
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function insn_bd (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 2);
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end;
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function insn_bf (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 23);
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end;
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function insn_fxm (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(19 downto 12);
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end;
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function insn_bo (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 21);
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end;
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function insn_bi (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(20 downto 16);
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end;
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function insn_bh (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(12 downto 11);
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end;
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function insn_d (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 0);
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end;
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function insn_ds (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(15 downto 2);
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end;
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function insn_to (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(25 downto 21);
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end;
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function insn_bc (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(10 downto 6);
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end;
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function insn_sh (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(1) & insn_in(15 downto 11);
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end;
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function insn_me (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(5) & insn_in(10 downto 6);
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end;
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function insn_mb (insn_in : std_ulogic_vector) return std_ulogic_vector is
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begin
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return insn_in(5) & insn_in(10 downto 6);
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end;
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end package body insn_helpers;
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