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* don't use 8 byte copies in concatcopy by default, because

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a misaligned 8 byte load/store is much more expensive than
    a misaligned 4 byte load/store

git-svn-id: trunk@8182 -
This commit is contained in:
Jonas Maebe 2007-07-28 15:47:04 +00:00
parent b61e89b04e
commit ceeac6e8e4
1 changed files with 6 additions and 6 deletions
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12
compiler/powerpc/cgcpu.pas
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@ -1493,13 +1493,13 @@ const
{ ************* concatcopy ************ } { ************* concatcopy ************ }
{$ifndef ppc603} {$ifndef use8byteconcatcopy}
const const
maxmoveunit = 8; maxmoveunit = 8;
{$else ppc603} {$else use8byteconcatcopy}
const const
maxmoveunit = 4; maxmoveunit = 4;
{$endif ppc603} {$endif use8byteconcatcopy}
procedure tcgppc.g_concatcopy(list : TAsmList;const source,dest : treference;len : aint); procedure tcgppc.g_concatcopy(list : TAsmList;const source,dest : treference;len : aint);
@ -1569,7 +1569,7 @@ const
dst := dest; dst := dest;
end; end;
{$ifndef ppc603} {$ifndef use8byteconcatcopy}
if count > 4 then if count > 4 then
{ generate a loop } { generate a loop }
begin begin
@ -1619,7 +1619,7 @@ const
inc(dst.offset,4); inc(dst.offset,4);
a_reg_dealloc(list,NR_R0); a_reg_dealloc(list,NR_R0);
end; end;
{$else not ppc603} {$else not use8byteconcatcopy}
if count > 4 then if count > 4 then
{ generate a loop } { generate a loop }
begin begin
@ -1661,7 +1661,7 @@ const
a_reg_dealloc(list,NR_R0); a_reg_dealloc(list,NR_R0);
len := len mod 4; len := len mod 4;
end; end;
{$endif not ppc603} {$endif not use8byteconcatcopy}
{ copy the leftovers } { copy the leftovers }
if (len and 2) <> 0 then if (len and 2) <> 0 then
begin begin