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+ perform the "i:=-i" / "i:=not i" optimization even when there are typecasts

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inserted; this makes the optimization work for all integer types

git-svn-id: trunk@35763 -
This commit is contained in:
nickysn 2017-04-10 14:06:19 +00:00
parent 98be270adb
commit d8406c4227
1 changed files with 34 additions and 3 deletions

37
compiler/nld.pas
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@ -670,9 +670,8 @@ implementation
end;
{ replace i:=not i by in_not_assign_x(i)
i:=-i by in_neg_assign_x(i)
todo: for some integer types, there are extra implicit
typecasts inserted by the compiler; this code should be
updated to handle them as well }
this handles the case, where there are no implicit type conversions }
if (right.nodetype in [notn,unaryminusn]) and
(tunarynode(right).left.isequal(left)) and
is_integer(tunarynode(right).left.resultdef) and
@ -690,6 +689,38 @@ implementation
left:=nil;
exit;
end;
{ replace i:=not i by in_not_assign_x(i)
i:=-i by in_neg_assign_x(i)
this handles the case with type conversions:
outer typeconv: right
neg/not: ttypeconvnode(right).left
inner typeconv: tunarynode(ttypeconvnode(right).left).left
right side 'i': ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left }
if (right.nodetype=typeconvn) and
(ttypeconvnode(right).convtype=tc_int_2_int) and
(ttypeconvnode(right).left.nodetype in [notn,unaryminusn]) and
is_integer(ttypeconvnode(right).left.resultdef) and
(right.resultdef.size<=ttypeconvnode(right).left.resultdef.size) and
(tunarynode(ttypeconvnode(right).left).left.nodetype=typeconvn) and
(ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).convtype=tc_int_2_int) and
are_equal_ints(right.resultdef,ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left.resultdef) and
ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left.isequal(left) and
is_integer(ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left.resultdef) and
((localswitches*[cs_check_overflow,cs_check_range])=[]) and
((right.localswitches*[cs_check_overflow,cs_check_range])=[]) and
valid_for_var(ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left,false) and
not(might_have_sideeffects(ttypeconvnode(tunarynode(ttypeconvnode(right).left).left).left)) then
begin
if ttypeconvnode(right).left.nodetype=notn then
newinlinenodetype:=in_not_assign_x
else
newinlinenodetype:=in_neg_assign_x;
result:=cinlinenode.createintern(
newinlinenodetype,false,left);
left:=nil;
exit;
end;
end;
end;
end;