paweld/fpc
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/fpc/source.git synced 2025-04-14 19:39:31 +02:00
Code Issues Packages Projects Releases Wiki Activity

* use popcnt instead of countbits.

Browse Source 
* change countbits to popcnt in case it is used by others.

suggestion by Bi0t1n, mantis 0038728

git-svn-id: trunk@49161 -
This commit is contained in:
marco 2021-04-10 10:56:47 +00:00
parent ff3f812d97
commit f26c366e9b
1 changed files with 2 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
packages/fcl-image/src/fpreadbmp.pp
View File

@ -124,15 +124,8 @@ end;
{ Counts how many bits are set }
function TFPReaderBMP.CountBits(Value : byte) : shortint;
var i,bits : shortint;
begin
bits:=0;
for i:=0 to 7 do
begin
if (value mod 2)<>0 then inc(bits);
value:=value shr 1;
end;
Result:=bits;
Result:=PopCnt(Value);
end;
{ If compression is bi_bitfields, there could be arbitrary masks for colors.
@ -156,7 +149,7 @@ begin
inc(tmp);
Mask:= Mask shr 1;
end;
tmp:=tmp-(8-CountBits(Mask and $FF));
tmp:=tmp-(8-popcnt(Mask and $FF));
Result:=tmp;
end;