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Generalize the mul_32bit and mul_signed fields of decode_rom_t

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This changes the names of the mul_32bit and mul_signed fields of
decode_rom_t to is_32bit and is_signed, so they can be used with
other types of operations besides multiplies.

This plumbs the is_32bit and is_signed flags down into execute1,
though they are not used at this point.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
pull/78/head
Paul Mackerras 5 years ago
parent 7fe84220a5
commit 90b6e27380
4 changed files with 30 additions and 23 deletions
Show Stats Download Patch File Download Diff File

7
common.vhdl
Unescape Escape View File

@ -61,9 +61,14 @@ package common is
output_carry: std_ulogic;
input_cr: std_ulogic;
output_cr: std_ulogic;
is_32bit: std_ulogic;
is_signed: std_ulogic;
insn: std_ulogic_vector(31 downto 0);
end record;
constant Decode2ToExecute1Init : Decode2ToExecute1Type := (valid => '0', insn_type => OP_ILLEGAL, lr => '0', rc => '0', invert_a => '0', input_carry => ZERO, output_carry => '0', input_cr => '0', output_cr => '0', others => (others => '0'));
constant Decode2ToExecute1Init : Decode2ToExecute1Type :=
(valid => '0', insn_type => OP_ILLEGAL, lr => '0', rc => '0', invert_a => '0',
input_carry => ZERO, output_carry => '0', input_cr => '0', output_cr => '0',
is_32bit => '0', is_signed => '0', others => (others => '0'));

type Decode2ToMultiplyType is record
valid: std_ulogic;

28
decode1.vhdl
Unescape Escape View File

@ -34,8 +34,8 @@ architecture behaviour of decode1 is
(ALU, OP_ILLEGAL, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1');

constant major_decode_rom_array : major_rom_array_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
12 => (ALU, OP_ADD, RA, CONST_SI, NONE, RT, '0', '0', '0', ZERO, '1', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- addic
13 => (ALU, OP_ADD, RA, CONST_SI, NONE, RT, '0', '0', '0', ZERO, '1', NONE, '0', '0', '0', '0', '0', '0', ONE, '0', '1'), -- addic.
14 => (ALU, OP_ADD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- addi
@ -99,8 +99,8 @@ architecture behaviour of decode1 is

-- indexed by bits 5, 3, 2 of instruction word
constant decode_op_19_array : op_19_subop_array_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
-- mcrf; cr logical ops not implemented yet
2#000# => (ALU, OP_MCRF, NONE, NONE, NONE, NONE, '1', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'),
-- addpcis not implemented yet
@ -113,8 +113,8 @@ architecture behaviour of decode1 is
);

constant decode_op_30_array : op_30_subop_array_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
2#010# => (ALU, OP_RLDIC, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#000# => (ALU, OP_RLDICL, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#001# => (ALU, OP_RLDICR, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
@ -126,8 +126,8 @@ architecture behaviour of decode1 is

-- Note: reformat with column -t -o ' '
constant decode_op_31_array : op_31_subop_array_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
2#0100001010# => (ALU, OP_ADD, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- add
2#0000001010# => (ALU, OP_ADD, RA, RB, NONE, RT, '0', '0', '0', ZERO, '1', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- addc
2#0010001010# => (ALU, OP_ADD, RA, RB, NONE, RT, '0', '0', '0', CA, '1', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- adde
@ -286,8 +286,8 @@ architecture behaviour of decode1 is
);

constant decode_op_58_array : minor_rom_array_2_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
0 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_DS, NONE, RT, '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- ld
1 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_DS, NONE, RT, '0', '0', '0', ZERO, '0', is8B, '0', '0', '1', '0', '0', '0', NONE, '0', '1'), -- ldu
2 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_DS, NONE, RT, '0', '0', '0', ZERO, '0', is4B, '0', '1', '0', '0', '0', '0', NONE, '0', '1'), -- lwa
@ -295,15 +295,15 @@ architecture behaviour of decode1 is
);

constant decode_op_62_array : minor_rom_array_2_t := (
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
0 => (LDST, OP_STORE, RA_OR_ZERO, CONST_DS, RS, NONE, '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- std
1 => (LDST, OP_STORE, RA_OR_ZERO, CONST_DS, RS, NONE, '0', '0', '0', ZERO, '0', is8B, '0', '0', '1', '0', '0', '0', NONE, '0', '1'), -- stdu
others => decode_rom_init
);

-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv mul mul rc lk sgl
-- op in out A in out len ext 32 sgn pipe
-- unit internal in1 in2 in3 out CR CR inv cry cry ldst BR sgn upd rsrv 32b sgn rc lk sgl
-- op in out A in out len ext pipe
constant attn_instr : decode_rom_t := (ALU, OP_ILLEGAL, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1');
constant nop_instr : decode_rom_t := (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1');
constant sim_cfg_instr : decode_rom_t := (ALU, OP_SIM_CONFIG,NONE, NONE, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1');

8
decode2.vhdl
Unescape Escape View File

@ -199,6 +199,8 @@ begin
v.e.invert_a := d_in.decode.invert_a;
v.e.input_carry := d_in.decode.input_carry;
v.e.output_carry := d_in.decode.output_carry;
v.e.is_32bit := d_in.decode.is_32bit;
v.e.is_signed := d_in.decode.is_signed;
if d_in.decode.lr = '1' then
v.e.lr := insn_lk(d_in.insn);
end if;
@ -211,8 +213,8 @@ begin
v.m.write_reg := decode_output_reg(d_in.decode.output_reg_a, d_in.insn);
v.m.rc := decode_rc(d_in.decode.rc, d_in.insn);

if d_in.decode.mul_32bit = '1' then
if d_in.decode.mul_signed = '1' then
if d_in.decode.is_32bit = '1' then
if d_in.decode.is_signed = '1' then
v.m.data1 := (others => mul_a(31));
v.m.data1(31 downto 0) := mul_a(31 downto 0);
v.m.data2 := (others => mul_b(31));
@ -222,7 +224,7 @@ begin
v.m.data2 := '0' & x"00000000" & mul_b(31 downto 0);
end if;
else
if d_in.decode.mul_signed = '1' then
if d_in.decode.is_signed = '1' then
v.m.data1 := mul_a(63) & mul_a;
v.m.data2 := mul_b(63) & mul_b;
else

10
decode_types.vhdl
Unescape Escape View File

@ -71,9 +71,9 @@ package decode_types is
update : std_ulogic;
reserve : std_ulogic;

-- multiplier signals
mul_32bit : std_ulogic;
mul_signed : std_ulogic;
-- multiplier and ALU signals
is_32bit : std_ulogic;
is_signed : std_ulogic;

rc : rc_t;
lr : std_ulogic;
@ -86,8 +86,8 @@ package decode_types is
output_reg_a => NONE, input_cr => '0', output_cr => '0',
invert_a => '0', input_carry => ZERO, output_carry => '0',
length => NONE, byte_reverse => '0', sign_extend => '0',
update => '0', reserve => '0', mul_32bit => '0',
mul_signed => '0', rc => NONE, lr => '0', sgl_pipe => '0');
update => '0', reserve => '0', is_32bit => '0',
is_signed => '0', rc => NONE, lr => '0', sgl_pipe => '0');

end decode_types;


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