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* x86: JccMovJmpMov2CMovCMov will no longer move

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MOV instructions (fixes i40122)
This commit is contained in:
J. Gareth "Curious Kit" Moreton 2023-02-15 20:44:13 +00:00 committed by FPK
parent 8f7e61eef6
commit 4d676cd6fa
1 changed files with 2 additions and 14 deletions
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16
compiler/x86/aoptx86.pas
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@ -12407,25 +12407,13 @@ unit aoptx86;
if there are any opposing CMOV pairs that
write to the same register }
for x := 0 to w - 1 do
if RegWrites[x] = taicpu(hp1).oper[1]^.reg then
if (RegWrites[x] = taicpu(hp1).oper[1]^.reg) then
begin
{ We have a match. Move this instruction
right to the top }
{ We have a match. Keep this as a MOV }
hp2 := hp1;
{ Move ahead in preparation }
GetNextInstruction(hp1, hp1);
asml.Remove(hp2);
asml.InsertAfter(hp2, hp_prev);
{ Note we can't use the trick of inserting before hp_prev
and then calling TrySwapMovOp with hp_prev2, like with
the MOV imm,reg optimisations, because hp2 may share a
register with the comparison }
if (hp_prev <> p) then
TrySwapMovCmp(hp_prev, hp2);
RegMatch := True;
Break;
end;