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core: Implement the cmpeqb and cmprb instructions

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Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2020-08-03 22:30:23 +10:00
parent b739372f7e
commit 8edfbf638b
3 changed files with 48 additions and 2 deletions
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4
decode1.vhdl
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@ -161,9 +161,9 @@ architecture behaviour of decode1 is
2#0011111100# => (ALU, OP_BPERM, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- bperm
2#0000000000# => (ALU, OP_CMP, RA, RB, NONE, NONE, '0', '1', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0'), -- cmp
2#0111111100# => (ALU, OP_CMPB, NONE, RB, RS, RA, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- cmpb
-- 2#0011100000# cmpeqb
2#0011100000# => (ALU, OP_CMPEQB, RA, RB, NONE, NONE, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- cmpeqb
2#0000100000# => (ALU, OP_CMP, RA, RB, NONE, NONE, '0', '1', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- cmpl
-- 2#0011000000# cmprb
2#0011000000# => (ALU, OP_CMPRB, RA, RB, NONE, NONE, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- cmprb
2#0000111010# => (ALU, OP_CNTZ, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- cntlzd
2#0000011010# => (ALU, OP_CNTZ, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- cntlzw
2#1000111010# => (ALU, OP_CNTZ, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- cnttzd

16
execute1.vhdl
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@ -633,6 +633,22 @@ begin
end if;
end if;
end if;
when OP_CMPRB =>
newcrf := ppc_cmprb(a_in, b_in, insn_l(e_in.insn));
bf := insn_bf(e_in.insn);
crnum := to_integer(unsigned(bf));
v.e.write_cr_enable := '1';
v.e.write_cr_mask := num_to_fxm(crnum);
v.e.write_cr_data := newcrf & newcrf & newcrf & newcrf &
newcrf & newcrf & newcrf & newcrf;
when OP_CMPEQB =>
newcrf := ppc_cmpeqb(a_in, b_in);
bf := insn_bf(e_in.insn);
crnum := to_integer(unsigned(bf));
v.e.write_cr_enable := '1';
v.e.write_cr_mask := num_to_fxm(crnum);
v.e.write_cr_data := newcrf & newcrf & newcrf & newcrf &
newcrf & newcrf & newcrf & newcrf;
when OP_AND | OP_OR | OP_XOR | OP_POPCNT | OP_PRTY | OP_CMPB | OP_EXTS | OP_BPERM =>
result := logical_result;
result_en := '1';

30
ppc_fx_insns.vhdl
View File

@ -87,6 +87,8 @@ package ppc_fx_insns is
so: std_ulogic) return std_ulogic_vector;
function ppc_cmpb (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_cmpeqb (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_cmprb (ra, rb: std_ulogic_vector(63 downto 0); l: std_ulogic) return std_ulogic_vector;
function ppc_divw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_divdu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
@ -746,6 +748,34 @@ package body ppc_fx_insns is
return ret;
end;
function ppc_cmpeqb (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
variable match: std_ulogic;
variable j: integer;
begin
match := '0';
for i in 0 to 7 loop
j := i * 8;
if ra(7 downto 0) = rb(j + 7 downto j) then
match := '1';
end if;
end loop;
return '0' & match & "00";
end;
function ppc_cmprb (ra, rb: std_ulogic_vector(63 downto 0); l: std_ulogic) return std_ulogic_vector is
variable match: std_ulogic;
variable v: unsigned(7 downto 0);
begin
match := '0';
v := unsigned(ra(7 downto 0));
if v >= unsigned(rb(7 downto 0)) and v <= unsigned(rb(15 downto 8)) then
match := '1';
elsif l = '1' and v >= unsigned(rb(23 downto 16)) and v <= unsigned(rb(31 downto 24)) then
match := '1';
end if;
return '0' & match & "00";
end;
-- Not synthesizable
function ppc_divw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
variable tmp: signed(31 downto 0);