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execute: Copy XER[SO] to CR for cmp[i] and cmpl[i] instructions

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We were copying in XER[SO] for the dot-form instructions but not the
explicit compare instructions.  Fix this.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
pull/122/head
Paul Mackerras 5 years ago
parent 501b6daf9b
commit ec9b27660f
3 changed files with 36 additions and 28 deletions
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4
execute1.vhdl
Unescape Escape View File

@ -291,7 +291,7 @@ begin
for i in 0 to 7 loop
lo := i*4;
hi := lo + 3;
v.e.write_cr_data(hi downto lo) := ppc_cmp(l, e_in.read_data1, e_in.read_data2);
v.e.write_cr_data(hi downto lo) := ppc_cmp(l, e_in.read_data1, e_in.read_data2, v.e.xerc.so);
end loop;
when OP_CMPL =>
bf := insn_bf(e_in.insn);
@ -302,7 +302,7 @@ begin
for i in 0 to 7 loop
lo := i*4;
hi := lo + 3;
v.e.write_cr_data(hi downto lo) := ppc_cmpl(l, e_in.read_data1, e_in.read_data2);
v.e.write_cr_data(hi downto lo) := ppc_cmpl(l, e_in.read_data1, e_in.read_data2, v.e.xerc.so);
end loop;
when OP_CNTZ =>
result := countzero_result;

28
helpers.vhdl
Unescape Escape View File

@ -17,8 +17,8 @@ package helpers is

function cmp_one_byte(a, b: std_ulogic_vector(7 downto 0)) return std_ulogic_vector;

function ppc_signed_compare(a, b: signed(63 downto 0)) return std_ulogic_vector;
function ppc_unsigned_compare(a, b: unsigned(63 downto 0)) return std_ulogic_vector;
function ppc_signed_compare(a, b: signed(63 downto 0); so: std_ulogic) return std_ulogic_vector;
function ppc_unsigned_compare(a, b: unsigned(63 downto 0); so: std_ulogic) return std_ulogic_vector;

function ra_or_zero(ra: std_ulogic_vector(63 downto 0); reg: std_ulogic_vector(4 downto 0)) return std_ulogic_vector;

@ -126,32 +126,32 @@ package body helpers is
return ret;
end;

function ppc_signed_compare(a, b: signed(63 downto 0)) return std_ulogic_vector is
variable ret: std_ulogic_vector(3 downto 0);
function ppc_signed_compare(a, b: signed(63 downto 0); so: std_ulogic) return std_ulogic_vector is
variable ret: std_ulogic_vector(2 downto 0);
begin
if a < b then
ret := "1000";
ret := "100";
elsif a > b then
ret := "0100";
ret := "010";
else
ret := "0010";
ret := "001";
end if;

return ret;
return ret & so;
end;

function ppc_unsigned_compare(a, b: unsigned(63 downto 0)) return std_ulogic_vector is
variable ret: std_ulogic_vector(3 downto 0);
function ppc_unsigned_compare(a, b: unsigned(63 downto 0); so: std_ulogic) return std_ulogic_vector is
variable ret: std_ulogic_vector(2 downto 0);
begin
if a < b then
ret := "1000";
ret := "100";
elsif a > b then
ret := "0100";
ret := "010";
else
ret := "0010";
ret := "001";
end if;

return ret;
return ret & so;
end;

function ra_or_zero(ra: std_ulogic_vector(63 downto 0); reg: std_ulogic_vector(4 downto 0)) return std_ulogic_vector is

32
ppc_fx_insns.vhdl
Unescape Escape View File

@ -77,10 +77,14 @@ package ppc_fx_insns is
function ppc_mulhw (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_mulhwu (ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector;
function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;
function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
so: std_ulogic) return std_ulogic_vector;
function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
so: std_ulogic) return std_ulogic_vector;
function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
so: std_ulogic) return std_ulogic_vector;
function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
so: std_ulogic) return std_ulogic_vector;

function ppc_cmpb (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector;

@ -677,7 +681,8 @@ package body ppc_fx_insns is
return std_ulogic_vector(tmp(63 downto 32)) & std_ulogic_vector(tmp(63 downto 32));
end;

function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
function ppc_cmpi (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
so: std_ulogic) return std_ulogic_vector is
variable tmp: signed(ra'range);
begin
tmp := signed(ra);
@ -685,10 +690,11 @@ package body ppc_fx_insns is
tmp := resize(signed(ra(31 downto 0)), tmp'length);
end if;

return ppc_signed_compare(tmp, resize(signed(si), tmp'length));
return ppc_signed_compare(tmp, resize(signed(si), tmp'length), so);
end;

function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
function ppc_cmp (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
so: std_ulogic) return std_ulogic_vector is
variable tmpa, tmpb: signed(ra'range);
begin
tmpa := signed(ra);
@ -698,10 +704,11 @@ package body ppc_fx_insns is
tmpb := resize(signed(rb(31 downto 0)), ra'length);
end if;

return ppc_signed_compare(tmpa, tmpb);
return ppc_signed_compare(tmpa, tmpb, so);
end;

function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0)) return std_ulogic_vector is
function ppc_cmpli (l: std_ulogic; ra: std_ulogic_vector(63 downto 0); si: std_ulogic_vector(15 downto 0);
so: std_ulogic) return std_ulogic_vector is
variable tmp: unsigned(ra'range);
begin
tmp := unsigned(ra);
@ -709,10 +716,11 @@ package body ppc_fx_insns is
tmp := resize(unsigned(ra(31 downto 0)), tmp'length);
end if;

return ppc_unsigned_compare(tmp, resize(unsigned(si), tmp'length));
return ppc_unsigned_compare(tmp, resize(unsigned(si), tmp'length), so);
end;

function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is
function ppc_cmpl (l: std_ulogic; ra, rb: std_ulogic_vector(63 downto 0);
so: std_ulogic) return std_ulogic_vector is
variable tmpa, tmpb: unsigned(ra'range);
begin
tmpa := unsigned(ra);
@ -722,7 +730,7 @@ package body ppc_fx_insns is
tmpb := resize(unsigned(rb(31 downto 0)), ra'length);
end if;

return ppc_unsigned_compare(tmpa, tmpb);
return ppc_unsigned_compare(tmpa, tmpb, so);
end;

function ppc_cmpb (rs, rb: std_ulogic_vector(63 downto 0)) return std_ulogic_vector is

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