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

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

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
2019-10-16 12:32:45 +11:00
parent da0bd89c43
commit bddc9327cc
1 changed files with 23 additions and 24 deletions
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47
execute1.vhdl
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@@ -108,7 +108,7 @@ begin
variable result : std_ulogic_vector(63 downto 0);
variable newcrf : std_ulogic_vector(3 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 scrnum : crnum_t;
variable lo, hi : integer;
@@ -120,7 +120,7 @@ begin
begin
result := (others => '0');
result_with_carry := (others => '0');
result_en := 0;
result_en := '0';
newcrf := (others => '0');
v := r;
@@ -164,10 +164,10 @@ begin
if e_in.output_carry then
ctrl_tmp.carry <= result_with_carry(64);
end if;
result_en := 1;
result_en := '1';
when OP_AND | OP_OR | OP_XOR =>
result := logical_result;
result_en := 1;
result_en := '1';
when OP_B =>
f_out.redirect <= '1';
if (insn_aa(e_in.insn)) then
@@ -206,7 +206,7 @@ begin
end if;
when OP_CMPB =>
result := ppc_cmpb(e_in.read_data3, e_in.read_data2);
result_en := 1;
result_en := '1';
when OP_CMP =>
bf := insn_bf(e_in.insn);
l := insn_l(e_in.insn);
@@ -231,12 +231,12 @@ begin
end loop;
when OP_CNTZ =>
result := countzero_result;
result_en := 1;
result_en := '1';
when OP_EXTS =>
v.e.write_len := e_in.data_len;
v.e.sign_extend := '1';
result := e_in.read_data3;
result_en := 1;
result_en := '1';
when OP_ISEL =>
crnum := to_integer(unsigned(insn_bc(e_in.insn)));
if e_in.cr(31-crnum) = '1' then
@@ -244,7 +244,7 @@ begin
else
result := e_in.read_data2;
end if;
result_en := 1;
result_en := '1';
when OP_MCRF =>
bf := insn_bf(e_in.insn);
bfa := insn_bfa(e_in.insn);
@@ -267,13 +267,13 @@ begin
when OP_MFSPR =>
if std_match(e_in.insn(20 downto 11), "0100100000") then
result := ctrl.ctr;
result_en := 1;
result_en := '1';
elsif std_match(e_in.insn(20 downto 11), "0100000000") then
result := ctrl.lr;
result_en := 1;
result_en := '1';
elsif std_match(e_in.insn(20 downto 11), "0110001000") then
result := ctrl.tb;
result_en := 1;
result_en := '1';
end if;
when OP_MFCR =>
if e_in.insn(20) = '0' then
@@ -291,7 +291,7 @@ begin
end if;
end loop;
end if;
result_en := 1;
result_en := '1';
when OP_MTCRF =>
v.e.write_cr_enable := '1';
if e_in.insn(20) = '0' then
@@ -311,25 +311,25 @@ begin
end if;
when OP_POPCNTB =>
result := ppc_popcntb(e_in.read_data3);
result_en := 1;
result_en := '1';
when OP_POPCNTW =>
result := ppc_popcntw(e_in.read_data3);
result_en := 1;
result_en := '1';
when OP_POPCNTD =>
result := ppc_popcntd(e_in.read_data3);
result_en := 1;
result_en := '1';
when OP_PRTYD =>
result := ppc_prtyd(e_in.read_data3);
result_en := 1;
result_en := '1';
when OP_PRTYW =>
result := ppc_prtyw(e_in.read_data3);
result_en := 1;
result_en := '1';
when OP_RLC | OP_RLCL | OP_RLCR | OP_SHL | OP_SHR =>
result := rotator_result;
if e_in.output_carry = '1' then
ctrl_tmp.carry <= rotator_carry;
end if;
result_en := 1;
result_en := '1';
when OP_SIM_CONFIG =>
-- bit 0 was used to select the microwatt console, which
-- we no longer support.
@@ -338,7 +338,7 @@ begin
else
result := x"0000000000000000";
end if;
result_en := 1;
result_en := '1';
when OP_TDI =>
-- Keep our test cases happy for now, ignore trap instructions
@@ -353,13 +353,12 @@ begin
ctrl_tmp.lr <= std_ulogic_vector(unsigned(e_in.nia) + 4);
end if;
if result_en = 1 then
v.e.write_data := result;
v.e.write_enable := '1';
v.e.rc := e_in.rc;
end if;
end if;
v.e.write_data := result;
v.e.write_enable := result_en;
v.e.rc := e_in.rc;
-- Update registers
rin <= v;