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* in the generic implementation of fpc_mul_int64, fallback directly to

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fpc_mul_qword directly in case overflow checking is not used

git-svn-id: trunk@26483 -
This commit is contained in:
nickysn 2014-01-17 01:25:41 +00:00
parent e210d5f30e
commit 34cf432600
1 changed files with 32 additions and 25 deletions
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57
rtl/inc/int64.inc
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@ -310,39 +310,46 @@
q1,q2,q3 : qword; q1,q2,q3 : qword;
begin begin
begin { there's no difference between signed and unsigned multiplication,
sign:=false; when the destination size is equal to the source size and overflow
if f1<0 then checking is off }
begin if not checkoverflow then
sign:=not(sign); { qword(f1)*qword(f2) is coded as a call to mulqword }
q1:=qword(-f1); fpc_mul_int64:=int64(qword(f1)*qword(f2))
end else
else begin
q1:=f1; sign:=false;
if f2<0 then if f1<0 then
begin begin
sign:=not(sign); sign:=not(sign);
q2:=qword(-f2); q1:=qword(-f1);
end end
else else
q2:=f2; q1:=f1;
{ the q1*q2 is coded as call to mulqword } if f2<0 then
q3:=q1*q2; begin
sign:=not(sign);
q2:=qword(-f2);
end
else
q2:=f2;
{ the q1*q2 is coded as call to mulqword }
q3:=q1*q2;
if checkoverflow and (q1 <> 0) and (q2 <>0) and if (q1 <> 0) and (q2 <>0) and
((q1>q3) or (q2>q3) or ((q1>q3) or (q2>q3) or
{ the bit 63 can be only set if we have $80000000 00000000 } { the bit 63 can be only set if we have $80000000 00000000 }
{ and sign is true } { and sign is true }
(q3 shr 63<>0) and (q3 shr 63<>0) and
((q3<>qword(qword(1) shl 63)) or not(sign)) ((q3<>qword(qword(1) shl 63)) or not(sign))
) then ) then
HandleErrorAddrFrameInd(215,get_pc_addr,get_frame); HandleErrorAddrFrameInd(215,get_pc_addr,get_frame);
if sign then if sign then
fpc_mul_int64:=-q3 fpc_mul_int64:=-q3
else else
fpc_mul_int64:=q3; fpc_mul_int64:=q3;
end; end;
end; end;
{$endif FPC_SYSTEM_HAS_MUL_INT64} {$endif FPC_SYSTEM_HAS_MUL_INT64}