github.com/antonblanchard.microwatt
1
0
Fork 0
mirror of https://github.com/antonblanchard/microwatt.git synced 2026-01-11 23:43:15 +00:00
Code Releases Activity

crhelpers: Constraint "crnum" integer

Browse Source 
This seems to save quite a few LUTs

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2019-10-16 12:11:16 +11:00
parent 4437487ad0
commit da0bd89c43
2 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
crhelpers.vhdl
View File

@ -5,13 +5,16 @@ library work;
use work.common.all; use work.common.all;
package crhelpers is package crhelpers is
function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer; subtype crnum_t is integer range 0 to 7;
function num_to_fxm(num: integer) return std_ulogic_vector; subtype crmask_t is std_ulogic_vector(7 downto 0);
function fxm_to_num(fxm: crmask_t) return crnum_t;
function num_to_fxm(num: crnum_t) return crmask_t;
end package crhelpers; end package crhelpers;
package body crhelpers is package body crhelpers is
function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer is function fxm_to_num(fxm: crmask_t) return crnum_t is
begin begin
-- If multiple fields are set (undefined), match existing -- If multiple fields are set (undefined), match existing
-- hardware by returning the first one. -- hardware by returning the first one.
@ -27,7 +30,7 @@ package body crhelpers is
return 7; return 7;
end; end;
function num_to_fxm(num: integer) return std_ulogic_vector is function num_to_fxm(num: crnum_t) return crmask_t is
begin begin
case num is case num is
when 0 => when 0 =>

4
execute1.vhdl
View File

@ -109,8 +109,8 @@ begin
variable newcrf : std_ulogic_vector(3 downto 0); variable newcrf : std_ulogic_vector(3 downto 0);
variable result_with_carry : std_ulogic_vector(64 downto 0); variable result_with_carry : std_ulogic_vector(64 downto 0);
variable result_en : integer; variable result_en : integer;
variable crnum : integer; variable crnum : crnum_t;
variable scrnum : integer; variable scrnum : crnum_t;
variable lo, hi : integer; variable lo, hi : integer;
variable sh, mb, me : std_ulogic_vector(5 downto 0); variable sh, mb, me : std_ulogic_vector(5 downto 0);
variable sh32, mb32, me32 : std_ulogic_vector(4 downto 0); variable sh32, mb32, me32 : std_ulogic_vector(4 downto 0);