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microwatt
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decode: Avoid multiplexing from instruction reg fields to regfile address ports

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This aims to simplify the logic between the instruction image and
the register file read address ports and reduce the size of the decode
tables.  With this patch, the input_reg_a column of the decode tables
can only select RA or zeroes, the input_reg_b column can only select
RB or a constant (0, -1, or an immediate value from the instruction),
and the input_reg_c columns can only select RS or zeroes.

That means that the rotate/shift/logical ops now have their first
input coming in via the input_reg_c column.  That means we need to
add a read_data3 field to the Decode2ToExecuteType record, but that
will go away again when we split out the rotate/mask/logical ops to
their own unit.

As a related but not tightly connected change, this patch also sets
the read1_enable signal to the register file be 0 when RA=0 and the
input_reg_a for the instruction is RA_OR_ZERO (previously it was 1).

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
jtag-port
Paul Mackerras 6 years ago
parent 96b402a4bf
commit 7fe84220a5
5 changed files with 97 additions and 110 deletions
Show Stats Download Patch File Download Diff File

1
common.vhdl
Unescape Escape View File

@ -52,6 +52,7 @@ package common is
read_reg2: std_ulogic_vector(4 downto 0);
read_data1: std_ulogic_vector(63 downto 0);
read_data2: std_ulogic_vector(63 downto 0);
read_data3: std_ulogic_vector(63 downto 0);
cr: std_ulogic_vector(31 downto 0);
lr: std_ulogic;
rc: std_ulogic;

92
decode1.vhdl
Unescape Escape View File

@ -40,8 +40,8 @@ architecture behaviour of decode1 is
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
15 => (ALU, OP_ADD, RA_OR_ZERO, CONST_SI_HI, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- addis
28 => (ALU, OP_AND, RS, CONST_UI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', ONE, '0', '1'), -- andi.
29 => (ALU, OP_AND, RS, CONST_UI_HI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', ONE, '0', '1'), -- andis.
28 => (ALU, OP_AND, NONE, CONST_UI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', ONE, '0', '1'), -- andi.
29 => (ALU, OP_AND, NONE, CONST_UI_HI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', ONE, '0', '1'), -- andis.
18 => (ALU, OP_B, NONE, CONST_LI, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '1', '1'), -- b
16 => (ALU, OP_BC, NONE, CONST_BD, NONE, NONE, '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '1', '1'), -- bc
11 => (ALU, OP_CMP, RA, CONST_SI, NONE, NONE, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- cmpi
@ -55,11 +55,11 @@ architecture behaviour of decode1 is
32 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- lwz
33 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', ZERO, '0', is4B, '0', '0', '1', '0', '0', '0', NONE, '0', '1'), -- lwzu
7 => (MUL, OP_MUL_L64, RA, CONST_SI, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '1'), -- mulli
24 => (ALU, OP_OR, RS, CONST_UI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- ori
25 => (ALU, OP_OR, RS, CONST_UI_HI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- oris
20 => (ALU, OP_RLWIMI, RA, RS, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwimi
21 => (ALU, OP_RLWINM, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwinm
23 => (ALU, OP_RLWNM, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwnm
24 => (ALU, OP_OR, NONE, CONST_UI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- ori
25 => (ALU, OP_OR, NONE, CONST_UI_HI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- oris
20 => (ALU, OP_RLWIMI, RA, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwimi
21 => (ALU, OP_RLWINM, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwinm
23 => (ALU, OP_RLWNM, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- rlwnm
38 => (LDST, OP_STORE, RA_OR_ZERO, CONST_SI, RS, NONE, '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- stb
39 => (LDST, OP_STORE, RA_OR_ZERO, CONST_SI, RS, NONE, '0', '0', '0', ZERO, '0', is1B, '0', '0', '1', '0', '0', '0', RC, '0', '1'), -- stbu
44 => (LDST, OP_STORE, RA_OR_ZERO, CONST_SI, RS, NONE, '0', '0', '0', ZERO, '0', is2B, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- sth
@ -69,8 +69,8 @@ architecture behaviour of decode1 is
8 => (ALU, OP_ADD, RA, CONST_SI, NONE, RT, '0', '0', '1', ONE, '1', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- subfic
2 => (ALU, OP_TDI, RA, CONST_SI, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- tdi
--PPC_TWI 3
26 => (ALU, OP_XOR, RS, CONST_UI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- xori
27 => (ALU, OP_XOR, RS, CONST_UI_HI, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- xoris
26 => (ALU, OP_XOR, NONE, CONST_UI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- xori
27 => (ALU, OP_XOR, NONE, CONST_UI_HI, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- xoris
others => illegal_inst
);

@ -115,12 +115,12 @@ 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
2#010# => (ALU, OP_RLDIC, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#000# => (ALU, OP_RLDICL, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#001# => (ALU, OP_RLDICR, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#011# => (ALU, OP_RLDIMI, RA, RS, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
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'),
2#011# => (ALU, OP_RLDIMI, RA, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
-- rldcl, rldcr
2#100# => (ALU, OP_RLDCX, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
2#100# => (ALU, OP_RLDCX, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'),
others => illegal_inst
);

@ -133,18 +133,18 @@ architecture behaviour of decode1 is
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
2#0011101010# => (ALU, OP_ADD, RA, CONST_M1, NONE, RT, '0', '0', '0', CA, '1', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- addme
2#0011001010# => (ALU, OP_ADD, RA, NONE, NONE, RT, '0', '0', '0', CA, '1', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- addze
2#0000011100# => (ALU, OP_AND, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- and
2#0000111100# => (ALU, OP_ANDC, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- andc
2#0000011100# => (ALU, OP_AND, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- and
2#0000111100# => (ALU, OP_ANDC, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- andc
-- 2#0011111100# bperm
2#0000000000# => (ALU, OP_CMP, RA, RB, NONE, NONE, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- cmp
2#0111111100# => (ALU, OP_CMPB, RS, RB, NONE, RA, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- cmpb
2#0111111100# => (ALU, OP_CMPB, NONE, RB, RS, RA, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- cmpb
-- 2#0011100000# cmpeqb
2#0000100000# => (ALU, OP_CMPL, RA, RB, NONE, NONE, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- cmpl
-- 2#0011000000# cmprb
2#0000111010# => (ALU, OP_CNTLZD, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cntlzd
2#0000011010# => (ALU, OP_CNTLZW, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cntlzw
2#1000111010# => (ALU, OP_CNTTZD, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cnttzd
2#1000011010# => (ALU, OP_CNTTZW, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cnttzw
2#0000111010# => (ALU, OP_CNTLZD, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cntlzd
2#0000011010# => (ALU, OP_CNTLZW, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cntlzw
2#1000111010# => (ALU, OP_CNTTZD, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cnttzd
2#1000011010# => (ALU, OP_CNTTZW, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- cnttzw
-- 2#1011110011# darn
2#0001010110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- dcbf
2#0000110110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- dcbst
@ -159,10 +159,10 @@ architecture behaviour of decode1 is
2#0111001011# => (DIV, OP_DIV, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- divwu
2#0111101001# => (DIV, OP_DIV, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- divd
2#0111101011# => (DIV, OP_DIV, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- divw
2#0100011100# => (ALU, OP_EQV, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- eqv
2#1110111010# => (ALU, OP_EXTSB, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsb
2#1110011010# => (ALU, OP_EXTSH, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsh
2#1111011010# => (ALU, OP_EXTSW, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsw
2#0100011100# => (ALU, OP_EQV, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- eqv
2#1110111010# => (ALU, OP_EXTSB, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsb
2#1110011010# => (ALU, OP_EXTSH, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsh
2#1111011010# => (ALU, OP_EXTSW, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- extsw
-- 2#110111101-# extswsli
-- 2#1111010110# icbi
2#0000010110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- icbt
@ -225,8 +225,8 @@ architecture behaviour of decode1 is
2#0100001011# => (DIV, OP_MOD, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- moduw
2#1100001001# => (DIV, OP_MOD, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- modsd
2#1100001011# => (DIV, OP_MOD, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- modsw
2#0010010000# => (ALU, OP_MTCRF, RS, NONE, NONE, NONE, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- mtcrf/mtocrf
2#0111010011# => (ALU, OP_MTSPR, RS, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- mtspr
2#0010010000# => (ALU, OP_MTCRF, NONE, NONE, RS, NONE, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- mtcrf/mtocrf
2#0111010011# => (ALU, OP_MTSPR, NONE, NONE, RS, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- mtspr
2#0001001001# => (MUL, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '1'), -- mulhd
2#0000001001# => (MUL, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- mulhdu
2#0001001011# => (MUL, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '1'), -- mulhw
@ -238,26 +238,26 @@ architecture behaviour of decode1 is
2#1000001011# => (MUL, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '1'), -- mulhwu
2#0011101001# => (MUL, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '1'), -- mulld
2#0011101011# => (MUL, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '1'), -- mullw
2#0111011100# => (ALU, OP_NAND, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- nand
2#0111011100# => (ALU, OP_NAND, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- nand
2#0001101000# => (ALU, OP_NEG, RA, RB, NONE, RT, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- neg
2#0001111100# => (ALU, OP_NOR, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- nor
2#0110111100# => (ALU, OP_OR, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- or
2#0110011100# => (ALU, OP_ORC, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- orc
2#0001111010# => (ALU, OP_POPCNTB, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntb
2#0111111010# => (ALU, OP_POPCNTD, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntd
2#0101111010# => (ALU, OP_POPCNTW, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntw
2#0010111010# => (ALU, OP_PRTYD, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- prtyd
2#0010011010# => (ALU, OP_PRTYW, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- prtyw
2#0001111100# => (ALU, OP_NOR, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- nor
2#0110111100# => (ALU, OP_OR, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- or
2#0110011100# => (ALU, OP_ORC, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- orc
2#0001111010# => (ALU, OP_POPCNTB, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntb
2#0111111010# => (ALU, OP_POPCNTD, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntd
2#0101111010# => (ALU, OP_POPCNTW, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- popcntw
2#0010111010# => (ALU, OP_PRTYD, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- prtyd
2#0010011010# => (ALU, OP_PRTYW, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- prtyw
-- 2#0010000000# setb
2#0000011011# => (ALU, OP_SLD, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sld
2#0000011000# => (ALU, OP_SLW, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- slw
2#1100011010# => (ALU, OP_SRAD, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srad
2#1100111010# => (ALU, OP_SRADI, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sradi
2#1100111011# => (ALU, OP_SRADI, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sradi
2#1100011000# => (ALU, OP_SRAW, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sraw
2#1100111000# => (ALU, OP_SRAWI, RS, NONE, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srawi
2#1000011011# => (ALU, OP_SRD, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srd
2#1000011000# => (ALU, OP_SRW, RS, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srw
2#0000011011# => (ALU, OP_SLD, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sld
2#0000011000# => (ALU, OP_SLW, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- slw
2#1100011010# => (ALU, OP_SRAD, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srad
2#1100111010# => (ALU, OP_SRADI, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sradi
2#1100111011# => (ALU, OP_SRADI, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sradi
2#1100011000# => (ALU, OP_SRAW, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- sraw
2#1100111000# => (ALU, OP_SRAWI, NONE, NONE, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srawi
2#1000011011# => (ALU, OP_SRD, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srd
2#1000011000# => (ALU, OP_SRW, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- srw
2#1010110110# => (LDST, OP_STORE, RA_OR_ZERO, RB, RS, NONE, '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '1', '0', '0', RC, '0', '1'), -- stbcx
2#0011110111# => (LDST, OP_STORE, RA_OR_ZERO, RB, RS, NONE, '0', '0', '0', ZERO, '0', is1B, '0', '0', '1', '0', '0', '0', RC, '0', '1'), -- stbux
2#0011010111# => (LDST, OP_STORE, RA_OR_ZERO, RB, RS, NONE, '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- stbx
@ -281,7 +281,7 @@ architecture behaviour of decode1 is
2#1001010110# => (ALU, OP_NOP, NONE, NONE, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- sync
-- 2#0001000100# td
2#0000000100# => (ALU, OP_TW, RA, RB, NONE, NONE, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- tw
2#0100111100# => (ALU, OP_XOR, RS, RB, NONE, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- xor
2#0100111100# => (ALU, OP_XOR, NONE, RB, RS, RA, '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '1'), -- xor
others => illegal_inst
);


28
decode2.vhdl
Unescape Escape View File

@ -62,16 +62,11 @@ architecture behaviour of decode2 is
function decode_input_reg_a (t : input_reg_a_t; insn_in : std_ulogic_vector(31 downto 0);
reg_data : std_ulogic_vector(63 downto 0)) return decode_input_reg_t is
begin
case t is
when RA =>
if t = RA or (t = RA_OR_ZERO and insn_ra(insn_in) /= "00000") then
return ('1', insn_ra(insn_in), reg_data);
when RA_OR_ZERO =>
return ('1', insn_ra(insn_in), ra_or_zero(reg_data, insn_ra(insn_in)));
when RS =>
return ('1', insn_rs(insn_in), reg_data);
when NONE =>
else
return ('0', (others => '0'), (others => '0'));
end case;
end if;
end;

function decode_input_reg_b (t : input_reg_b_t; insn_in : std_ulogic_vector(31 downto 0);
@ -80,8 +75,6 @@ architecture behaviour of decode2 is
case t is
when RB =>
return ('1', insn_rb(insn_in), reg_data);
when RS =>
return ('1', insn_rs(insn_in), reg_data);
when CONST_UI =>
return ('0', (others => '0'), std_ulogic_vector(resize(unsigned(insn_ui(insn_in)), 64)));
when CONST_SI =>
@ -152,17 +145,9 @@ begin
end if;
end process;

r_out.read1_reg <= insn_ra(d_in.insn) when (d_in.decode.input_reg_a = RA) else
insn_ra(d_in.insn) when d_in.decode.input_reg_a = RA_OR_ZERO else
insn_rs(d_in.insn) when d_in.decode.input_reg_a = RS else
(others => '0');

r_out.read2_reg <= insn_rb(d_in.insn) when d_in.decode.input_reg_b = RB else
insn_rs(d_in.insn) when d_in.decode.input_reg_b = RS else
(others => '0');

r_out.read3_reg <= insn_rs(d_in.insn) when d_in.decode.input_reg_c = RS else
(others => '0');
r_out.read1_reg <= insn_ra(d_in.insn);
r_out.read2_reg <= insn_rb(d_in.insn);
r_out.read3_reg <= insn_rs(d_in.insn);

c_out.read <= d_in.decode.input_cr;

@ -207,6 +192,7 @@ begin
v.e.read_data1 := decoded_reg_a.data;
v.e.read_reg2 := decoded_reg_b.reg;
v.e.read_data2 := decoded_reg_b.data;
v.e.read_data3 := decoded_reg_c.data;
v.e.write_reg := decode_output_reg(d_in.decode.output_reg_a, d_in.insn);
v.e.rc := decode_rc(d_in.decode.rc, d_in.insn);
v.e.cr := c_in.read_cr_data;

4
decode_types.vhdl
Unescape Escape View File

@ -21,8 +21,8 @@ package decode_types is
OP_SYNC, OP_TD, OP_TDI, OP_TW,
OP_TWI, OP_XOR, OP_SIM_CONFIG);

type input_reg_a_t is (NONE, RA, RA_OR_ZERO, RS);
type input_reg_b_t is (NONE, RB, RS, CONST_UI, CONST_SI, CONST_SI_HI, CONST_UI_HI, CONST_LI, CONST_BD, CONST_DS, CONST_M1);
type input_reg_a_t is (NONE, RA, RA_OR_ZERO);
type input_reg_b_t is (NONE, RB, CONST_UI, CONST_SI, CONST_SI_HI, CONST_UI_HI, CONST_LI, CONST_BD, CONST_DS, CONST_M1);
type input_reg_c_t is (NONE, RS);
type output_reg_a_t is (NONE, RT, RA);
type rc_t is (NONE, ONE, RC);

82
execute1.vhdl
Unescape Escape View File

@ -118,10 +118,10 @@ begin
end if;
result_en := 1;
when OP_AND =>
result := ppc_and(e_in.read_data1, e_in.read_data2);
result := ppc_and(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_ANDC =>
result := ppc_andc(e_in.read_data1, e_in.read_data2);
result := ppc_andc(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_B =>
f_out.redirect <= '1';
@ -160,7 +160,7 @@ begin
end if;
end if;
when OP_CMPB =>
result := ppc_cmpb(e_in.read_data1, e_in.read_data2);
result := ppc_cmpb(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_CMP =>
bf := insn_bf(e_in.insn);
@ -185,28 +185,28 @@ begin
v.e.write_cr_data(hi downto lo) := ppc_cmpl(l, e_in.read_data1, e_in.read_data2);
end loop;
when OP_CNTLZW =>
result := ppc_cntlzw(e_in.read_data1);
result := ppc_cntlzw(e_in.read_data3);
result_en := 1;
when OP_CNTTZW =>
result := ppc_cnttzw(e_in.read_data1);
result := ppc_cnttzw(e_in.read_data3);
result_en := 1;
when OP_CNTLZD =>
result := ppc_cntlzd(e_in.read_data1);
result := ppc_cntlzd(e_in.read_data3);
result_en := 1;
when OP_CNTTZD =>
result := ppc_cnttzd(e_in.read_data1);
result := ppc_cnttzd(e_in.read_data3);
result_en := 1;
when OP_EXTSB =>
result := ppc_extsb(e_in.read_data1);
result := ppc_extsb(e_in.read_data3);
result_en := 1;
when OP_EXTSH =>
result := ppc_extsh(e_in.read_data1);
result := ppc_extsh(e_in.read_data3);
result_en := 1;
when OP_EXTSW =>
result := ppc_extsw(e_in.read_data1);
result := ppc_extsw(e_in.read_data3);
result_en := 1;
when OP_EQV =>
result := ppc_eqv(e_in.read_data1, e_in.read_data2);
result := ppc_eqv(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_ISEL =>
crnum := to_integer(unsigned(insn_bc(e_in.insn)));
@ -273,125 +273,125 @@ begin
crnum := fxm_to_num(insn_fxm(e_in.insn));
v.e.write_cr_mask := num_to_fxm(crnum);
end if;
v.e.write_cr_data := e_in.read_data1(31 downto 0);
v.e.write_cr_data := e_in.read_data3(31 downto 0);
when OP_MTSPR =>
if std_match(e_in.insn(20 downto 11), "0100100000") then
ctrl_tmp.ctr <= e_in.read_data1;
ctrl_tmp.ctr <= e_in.read_data3;
elsif std_match(e_in.insn(20 downto 11), "0100000000") then
ctrl_tmp.lr <= e_in.read_data1;
ctrl_tmp.lr <= e_in.read_data3;
end if;
when OP_NAND =>
result := ppc_nand(e_in.read_data1, e_in.read_data2);
result := ppc_nand(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_NEG =>
result := ppc_neg(e_in.read_data1);
result_en := 1;
when OP_NOR =>
result := ppc_nor(e_in.read_data1, e_in.read_data2);
result := ppc_nor(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_OR =>
result := ppc_or(e_in.read_data1, e_in.read_data2);
result := ppc_or(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_ORC =>
result := ppc_orc(e_in.read_data1, e_in.read_data2);
result := ppc_orc(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_POPCNTB =>
result := ppc_popcntb(e_in.read_data1);
result := ppc_popcntb(e_in.read_data3);
result_en := 1;
when OP_POPCNTW =>
result := ppc_popcntw(e_in.read_data1);
result := ppc_popcntw(e_in.read_data3);
result_en := 1;
when OP_POPCNTD =>
result := ppc_popcntd(e_in.read_data1);
result := ppc_popcntd(e_in.read_data3);
result_en := 1;
when OP_PRTYD =>
result := ppc_prtyd(e_in.read_data1);
result := ppc_prtyd(e_in.read_data3);
result_en := 1;
when OP_PRTYW =>
result := ppc_prtyw(e_in.read_data1);
result := ppc_prtyw(e_in.read_data3);
result_en := 1;
when OP_RLDCX =>
-- note rldcl mb field and rldcr me field are in the same place
mb := insn_mb(e_in.insn);
if e_in.insn(1) = '0' then
result := ppc_rldcl(e_in.read_data1, e_in.read_data2, mb);
result := ppc_rldcl(e_in.read_data3, e_in.read_data2, mb);
else
result := ppc_rldcr(e_in.read_data1, e_in.read_data2, mb);
result := ppc_rldcr(e_in.read_data3, e_in.read_data2, mb);
end if;
result_en := 1;
when OP_RLDICL =>
sh := insn_sh(e_in.insn);
mb := insn_mb(e_in.insn);
result := ppc_rldicl(e_in.read_data1, sh, mb);
result := ppc_rldicl(e_in.read_data3, sh, mb);
result_en := 1;
when OP_RLDICR =>
sh := insn_sh(e_in.insn);
me := insn_me(e_in.insn);
result := ppc_rldicr(e_in.read_data1, sh, me);
result := ppc_rldicr(e_in.read_data3, sh, me);
result_en := 1;
when OP_RLWNM =>
mb32 := insn_mb32(e_in.insn);
me32 := insn_me32(e_in.insn);
result := ppc_rlwnm(e_in.read_data1, e_in.read_data2, mb32, me32);
result := ppc_rlwnm(e_in.read_data3, e_in.read_data2, mb32, me32);
result_en := 1;
when OP_RLWINM =>
sh32 := insn_sh32(e_in.insn);
mb32 := insn_mb32(e_in.insn);
me32 := insn_me32(e_in.insn);
result := ppc_rlwinm(e_in.read_data1, sh32, mb32, me32);
result := ppc_rlwinm(e_in.read_data3, sh32, mb32, me32);
result_en := 1;
when OP_RLDIC =>
sh := insn_sh(e_in.insn);
mb := insn_mb(e_in.insn);
result := ppc_rldic(e_in.read_data1, sh, mb);
result := ppc_rldic(e_in.read_data3, sh, mb);
result_en := 1;
when OP_RLDIMI =>
sh := insn_sh(e_in.insn);
mb := insn_mb(e_in.insn);
result := ppc_rldimi(e_in.read_data1, e_in.read_data2, sh, mb);
result := ppc_rldimi(e_in.read_data1, e_in.read_data3, sh, mb);
result_en := 1;
when OP_RLWIMI =>
sh32 := insn_sh32(e_in.insn);
mb32 := insn_mb32(e_in.insn);
me32 := insn_me32(e_in.insn);
result := ppc_rlwimi(e_in.read_data1, e_in.read_data2, sh32, mb32, me32);
result := ppc_rlwimi(e_in.read_data1, e_in.read_data3, sh32, mb32, me32);
result_en := 1;
when OP_SLD =>
result := ppc_sld(e_in.read_data1, e_in.read_data2);
result := ppc_sld(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_SLW =>
result := ppc_slw(e_in.read_data1, e_in.read_data2);
result := ppc_slw(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_SRAW =>
result_with_carry := ppc_sraw(e_in.read_data1, e_in.read_data2);
result_with_carry := ppc_sraw(e_in.read_data3, e_in.read_data2);
result := result_with_carry(63 downto 0);
ctrl_tmp.carry <= result_with_carry(64);
result_en := 1;
when OP_SRAWI =>
sh := '0' & insn_sh32(e_in.insn);
result_with_carry := ppc_srawi(e_in.read_data1, sh);
result_with_carry := ppc_srawi(e_in.read_data3, sh);
result := result_with_carry(63 downto 0);
ctrl_tmp.carry <= result_with_carry(64);
result_en := 1;
when OP_SRAD =>
result_with_carry := ppc_srad(e_in.read_data1, e_in.read_data2);
result_with_carry := ppc_srad(e_in.read_data3, e_in.read_data2);
result := result_with_carry(63 downto 0);
ctrl_tmp.carry <= result_with_carry(64);
result_en := 1;
when OP_SRADI =>
sh := insn_sh(e_in.insn);
result_with_carry := ppc_sradi(e_in.read_data1, sh);
result_with_carry := ppc_sradi(e_in.read_data3, sh);
result := result_with_carry(63 downto 0);
ctrl_tmp.carry <= result_with_carry(64);
result_en := 1;
when OP_SRD =>
result := ppc_srd(e_in.read_data1, e_in.read_data2);
result := ppc_srd(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_SRW =>
result := ppc_srw(e_in.read_data1, e_in.read_data2);
result := ppc_srw(e_in.read_data3, e_in.read_data2);
result_en := 1;
when OP_XOR =>
result := ppc_xor(e_in.read_data1, e_in.read_data2);
result := ppc_xor(e_in.read_data3, e_in.read_data2);
result_en := 1;

when OP_SIM_CONFIG =>

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