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Debugging code in AllocRegBetween is now safer and more accurate, and p2 can no longer be nil

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This commit is contained in:
J. Gareth "Curious Kit" Moreton 2022-01-04 00:55:59 +00:00 committed by FPK
parent 3a1efb7c07
commit 50a37d00e7
1 changed files with 12 additions and 7 deletions
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19
compiler/aoptobj.pas
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@ -1369,24 +1369,29 @@ Unit AoptObj;
(ptaiprop(p1.optinfo)^.usedregs <> initialusedregs) then
internalerror(2004101010); }
{$endif EXTDEBUG}
if not Assigned(p2) then
{ We need a valid final instruction }
InternalError(2022010401);
start := p1;
if (reg = NR_STACK_POINTER_REG) or
if (reg = NR_STACK_POINTER_REG) or
(reg = current_procinfo.framepointer) or
not(assigned(p1)) then
{ this happens with registers which are loaded implicitely, outside the }
{ current block (e.g. esi with self) }
exit;
{$ifdef allocregdebug}
insertllitem(p1.previous,p1,tai_comment.Create(strpnew('allocating '+std_regname(reg)+' from here...')));
insertllitem(p2,p2.next,tai_comment.Create(strpnew('allocated '+std_regname(reg)+' till here...')));
{$endif allocregdebug}
{ make sure we allocate it for this instruction }
getnextinstruction(p2,p2);
lastRemovedWasDealloc := false;
removedSomething := false;
firstRemovedWasAlloc := false;
{$ifdef allocregdebug}
hp := tai_comment.Create(strpnew('allocating '+std_regname(reg)+' from here...'));
insertllitem(p1.previous,p1,hp);
hp := tai_comment.Create(strpnew('allocated '+std_regname(reg)+' till here...'));
insertllitem(p2,p2.next,hp);
{$endif allocregdebug}
{ do it the safe way: always allocate the full super register,
as we do no register re-allocation in the peephole optimizer,
this does not hurt