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* improved qword*qword code, if no overflow checking is done

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This commit is contained in:
florian 2000-01-27 15:43:02 +00:00
parent d680066e7c
commit 042cb265c0
1 changed files with 56 additions and 20 deletions
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76
rtl/inc/int64.inc
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@ -123,7 +123,8 @@
{ can the fpu do the work? }
if fpuint64 then
begin
c:=comp(z)/comp(n);
// the c:=comp(...) is necessary to shut up the compiler
c:=comp(comp(z)/comp(n));
divint64:=qword(c);
end
else
@ -161,27 +162,58 @@
_f1,bitpos : qword;
l : longint;
{$ifdef i386}
r : qword;
{$endif i386}
begin
mulqword:=0;
bitpos:=1;
// store f1 for overflow checking
_f1:=f1;
for l:=0 to 63 do
{$ifdef i386}
if not(checkoverflow) then
begin
if (f2 and bitpos)<>0 then
mulqword:=mulqword+f1;
asm
movl f1+4,%edx
movl f2+4,%ecx
orl %ecx,%edx
movl f2,%edx
movl f1,%eax
jnz .Lqwordmultwomul
mull %edx
jmp .Lqwordmulready
.Lqwordmultwomul:
imul f1+4,%edx
imul %eax,%ecx
addl %edx,%ecx
mull f2
add %ecx,%edx
.Lqwordmulready:
movl %eax,r
movl %edx,r+4
end;
mulqword:=r;
end
else
{$endif i386}
begin
mulqword:=0;
bitpos:=1;
f1:=f1 shl 1;
bitpos:=bitpos shl 1;
// store f1 for overflow checking
_f1:=f1;
for l:=0 to 63 do
begin
if (f2 and bitpos)<>0 then
mulqword:=mulqword+f1;
f1:=f1 shl 1;
bitpos:=bitpos shl 1;
end;
{ if one of the operands is greater than the result an }
{ overflow occurs }
if checkoverflow and ((_f1>mulqword) or (f2>mulqword)) then
HandleErrorFrame(215,get_frame);
end;
{ if one of the operands is greater than the result an }
{ overflow occurs }
if checkoverflow and ((_f1>mulqword) or (f2>mulqword)) then
HandleErrorFrame(215,get_frame);
end;
{ multiplies two int64 ....
@ -202,7 +234,8 @@
{ can the fpu do the work ? }
if fpuint64 and not(checkoverflow) then
begin
c:=comp(f1)*comp(f2);
// the c:=comp(...) is necessary to shut up the compiler
c:=comp(comp(f1)*comp(f2));
mulint64:=int64(c);
end
else
@ -400,7 +433,10 @@
{
$Log$
Revision 1.16 2000-01-23 12:27:39 florian
Revision 1.17 2000-01-27 15:43:02 florian
* improved qword*qword code, if no overflow checking is done
Revision 1.16 2000/01/23 12:27:39 florian
* int64/int64 and int64*int64 is now done by the fpu if possible
Revision 1.15 2000/01/23 12:22:37 florian
@ -451,4 +487,4 @@
Revision 1.1 1998/12/12 12:15:41 florian
+ first implementation
}
}