execute1: Remove mux on "write_data" and "rc" outputs

Only "write_enable" needs to change, this shrinks the core a bit more

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
pull/109/head
Benjamin Herrenschmidt 5 years ago
parent da0bd89c43
commit bddc9327cc

@ -108,7 +108,7 @@ begin
variable result : std_ulogic_vector(63 downto 0); variable result : std_ulogic_vector(63 downto 0);
variable newcrf : std_ulogic_vector(3 downto 0); variable newcrf : std_ulogic_vector(3 downto 0);
variable result_with_carry : std_ulogic_vector(64 downto 0); variable result_with_carry : std_ulogic_vector(64 downto 0);
variable result_en : integer; variable result_en : std_ulogic;
variable crnum : crnum_t; variable crnum : crnum_t;
variable scrnum : crnum_t; variable scrnum : crnum_t;
variable lo, hi : integer; variable lo, hi : integer;
@ -120,7 +120,7 @@ begin
begin begin
result := (others => '0'); result := (others => '0');
result_with_carry := (others => '0'); result_with_carry := (others => '0');
result_en := 0; result_en := '0';
newcrf := (others => '0'); newcrf := (others => '0');


v := r; v := r;
@ -164,10 +164,10 @@ begin
if e_in.output_carry then if e_in.output_carry then
ctrl_tmp.carry <= result_with_carry(64); ctrl_tmp.carry <= result_with_carry(64);
end if; end if;
result_en := 1; result_en := '1';
when OP_AND | OP_OR | OP_XOR => when OP_AND | OP_OR | OP_XOR =>
result := logical_result; result := logical_result;
result_en := 1; result_en := '1';
when OP_B => when OP_B =>
f_out.redirect <= '1'; f_out.redirect <= '1';
if (insn_aa(e_in.insn)) then if (insn_aa(e_in.insn)) then
@ -206,7 +206,7 @@ begin
end if; end if;
when OP_CMPB => when OP_CMPB =>
result := ppc_cmpb(e_in.read_data3, e_in.read_data2); result := ppc_cmpb(e_in.read_data3, e_in.read_data2);
result_en := 1; result_en := '1';
when OP_CMP => when OP_CMP =>
bf := insn_bf(e_in.insn); bf := insn_bf(e_in.insn);
l := insn_l(e_in.insn); l := insn_l(e_in.insn);
@ -231,12 +231,12 @@ begin
end loop; end loop;
when OP_CNTZ => when OP_CNTZ =>
result := countzero_result; result := countzero_result;
result_en := 1; result_en := '1';
when OP_EXTS => when OP_EXTS =>
v.e.write_len := e_in.data_len; v.e.write_len := e_in.data_len;
v.e.sign_extend := '1'; v.e.sign_extend := '1';
result := e_in.read_data3; result := e_in.read_data3;
result_en := 1; result_en := '1';
when OP_ISEL => when OP_ISEL =>
crnum := to_integer(unsigned(insn_bc(e_in.insn))); crnum := to_integer(unsigned(insn_bc(e_in.insn)));
if e_in.cr(31-crnum) = '1' then if e_in.cr(31-crnum) = '1' then
@ -244,7 +244,7 @@ begin
else else
result := e_in.read_data2; result := e_in.read_data2;
end if; end if;
result_en := 1; result_en := '1';
when OP_MCRF => when OP_MCRF =>
bf := insn_bf(e_in.insn); bf := insn_bf(e_in.insn);
bfa := insn_bfa(e_in.insn); bfa := insn_bfa(e_in.insn);
@ -267,13 +267,13 @@ begin
when OP_MFSPR => when OP_MFSPR =>
if std_match(e_in.insn(20 downto 11), "0100100000") then if std_match(e_in.insn(20 downto 11), "0100100000") then
result := ctrl.ctr; result := ctrl.ctr;
result_en := 1; result_en := '1';
elsif std_match(e_in.insn(20 downto 11), "0100000000") then elsif std_match(e_in.insn(20 downto 11), "0100000000") then
result := ctrl.lr; result := ctrl.lr;
result_en := 1; result_en := '1';
elsif std_match(e_in.insn(20 downto 11), "0110001000") then elsif std_match(e_in.insn(20 downto 11), "0110001000") then
result := ctrl.tb; result := ctrl.tb;
result_en := 1; result_en := '1';
end if; end if;
when OP_MFCR => when OP_MFCR =>
if e_in.insn(20) = '0' then if e_in.insn(20) = '0' then
@ -291,7 +291,7 @@ begin
end if; end if;
end loop; end loop;
end if; end if;
result_en := 1; result_en := '1';
when OP_MTCRF => when OP_MTCRF =>
v.e.write_cr_enable := '1'; v.e.write_cr_enable := '1';
if e_in.insn(20) = '0' then if e_in.insn(20) = '0' then
@ -311,25 +311,25 @@ begin
end if; end if;
when OP_POPCNTB => when OP_POPCNTB =>
result := ppc_popcntb(e_in.read_data3); result := ppc_popcntb(e_in.read_data3);
result_en := 1; result_en := '1';
when OP_POPCNTW => when OP_POPCNTW =>
result := ppc_popcntw(e_in.read_data3); result := ppc_popcntw(e_in.read_data3);
result_en := 1; result_en := '1';
when OP_POPCNTD => when OP_POPCNTD =>
result := ppc_popcntd(e_in.read_data3); result := ppc_popcntd(e_in.read_data3);
result_en := 1; result_en := '1';
when OP_PRTYD => when OP_PRTYD =>
result := ppc_prtyd(e_in.read_data3); result := ppc_prtyd(e_in.read_data3);
result_en := 1; result_en := '1';
when OP_PRTYW => when OP_PRTYW =>
result := ppc_prtyw(e_in.read_data3); result := ppc_prtyw(e_in.read_data3);
result_en := 1; result_en := '1';
when OP_RLC | OP_RLCL | OP_RLCR | OP_SHL | OP_SHR => when OP_RLC | OP_RLCL | OP_RLCR | OP_SHL | OP_SHR =>
result := rotator_result; result := rotator_result;
if e_in.output_carry = '1' then if e_in.output_carry = '1' then
ctrl_tmp.carry <= rotator_carry; ctrl_tmp.carry <= rotator_carry;
end if; end if;
result_en := 1; result_en := '1';
when OP_SIM_CONFIG => when OP_SIM_CONFIG =>
-- bit 0 was used to select the microwatt console, which -- bit 0 was used to select the microwatt console, which
-- we no longer support. -- we no longer support.
@ -338,7 +338,7 @@ begin
else else
result := x"0000000000000000"; result := x"0000000000000000";
end if; end if;
result_en := 1; result_en := '1';


when OP_TDI => when OP_TDI =>
-- Keep our test cases happy for now, ignore trap instructions -- Keep our test cases happy for now, ignore trap instructions
@ -353,12 +353,11 @@ begin
ctrl_tmp.lr <= std_ulogic_vector(unsigned(e_in.nia) + 4); ctrl_tmp.lr <= std_ulogic_vector(unsigned(e_in.nia) + 4);
end if; end if;


if result_en = 1 then end if;

v.e.write_data := result; v.e.write_data := result;
v.e.write_enable := '1'; v.e.write_enable := result_en;
v.e.rc := e_in.rc; v.e.rc := e_in.rc;
end if;
end if;


-- Update registers -- Update registers
rin <= v; rin <= v;

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