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Bugfix in gen_fill_mask_rom (wrong result on zero shift amounts due to width mismatch)

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git-svn-id: http://moon:8086/svn/vhdl/trunk@509 cc03376c-175c-47c8-b038-4cd826a8556b
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jens
2009-10-14 21:15:31 +00:00
parent 47c0a1b682
commit 9a1a5579bf
1 changed files with 4 additions and 2 deletions
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lib/CPUs/MIPS/src/core/mips_shifter.vhd
+4 -2
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@@ -54,10 +54,12 @@ architecture Behavioral of shifter is
function gen_fill_mask_rom(data_width : natural) return fill_mask_rom_t is function gen_fill_mask_rom(data_width : natural) return fill_mask_rom_t is
variable result : fill_mask_rom_t; variable result : fill_mask_rom_t;
begin begin
for i in 0 to data_width-1 loop result(0) := (data_width-1 downto 0 => '0');
for i in 1 to data_width-1 loop
result(i) := (data_width-1-i downto 0 => '0') & (i-1 downto 0 => '1'); result(i) := (data_width-1-i downto 0 => '0') & (i-1 downto 0 => '1');
end loop; end loop;
for i in 0 to data_width-1 loop result(data_width) := (data_width-1 downto 0 => '0');
for i in 1 to data_width-1 loop
result(data_width+i) := (i-1 downto 0 => '1') & (data_width-1-i downto 0 => '0'); result(data_width+i) := (i-1 downto 0 => '1') & (data_width-1-i downto 0 => '0');
end loop; end loop;
return result; return result;