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* moved transformation of "mul by power-of-2" to shl from type check

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pass to pass 1 (where most optimizing transformations are located,
    and because the way it's written it goes wrong if left and right are
    a constant, and I'm working on moving the simplify code after the
    typechecking code so the resulttype for constant and non-constant
    expressions can be the same)

git-svn-id: trunk@10396 -
This commit is contained in:
Jonas Maebe 2008-02-27 15:56:40 +00:00
parent 179b840cea
commit 59ca0153e7
1 changed files with 25 additions and 25 deletions
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50
compiler/nadd.pas
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@ -761,7 +761,6 @@ implementation
hp : tnode;
rd,ld,nd : tdef;
hsym : tfieldvarsym;
i : longint;
llow,lhigh,
rlow,rhigh : tconstexprint;
strtype : tstringtype;
@ -945,29 +944,6 @@ implementation
{ if both are orddefs then check sub types }
else if (ld.typ=orddef) and (rd.typ=orddef) then
begin
{ optimize multiplacation by a power of 2 }
if not(cs_check_overflow in current_settings.localswitches) and
(nodetype = muln) and
(((left.nodetype = ordconstn) and
ispowerof2(tordconstnode(left).value,i)) or
((right.nodetype = ordconstn) and
ispowerof2(tordconstnode(right).value,i))) then
begin
if left.nodetype = ordconstn then
begin
tordconstnode(left).value := i;
result := cshlshrnode.create(shln,right,left);
end
else
begin
tordconstnode(right).value := i;
result := cshlshrnode.create(shln,left,right);
end;
left := nil;
right := nil;
exit;
end;
{ set for & and | operations in macpas mode: they only work on }
{ booleans, and always short circuit evaluation }
if (nf_short_bool in flags) then
@ -2376,10 +2352,11 @@ implementation
{$ifdef addstringopt}
hp : tnode;
{$endif addstringopt}
lt,rt : tnodetype;
rd,ld : tdef;
newstatement : tstatementnode;
temp : ttempcreatenode;
i : longint;
lt,rt : tnodetype;
begin
result:=nil;
@ -2422,6 +2399,29 @@ implementation
{ if both are orddefs then check sub types }
else if (ld.typ=orddef) and (rd.typ=orddef) then
begin
{ optimize multiplacation by a power of 2 }
if not(cs_check_overflow in current_settings.localswitches) and
(nodetype = muln) and
(((left.nodetype = ordconstn) and
ispowerof2(tordconstnode(left).value,i)) or
((right.nodetype = ordconstn) and
ispowerof2(tordconstnode(right).value,i))) then
begin
if left.nodetype = ordconstn then
begin
tordconstnode(left).value := i;
result := cshlshrnode.create(shln,right,left);
end
else
begin
tordconstnode(right).value := i;
result := cshlshrnode.create(shln,left,right);
end;
left := nil;
right := nil;
exit;
end;
{ 2 booleans ? }
if is_boolean(ld) and is_boolean(rd) then
begin