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* x86: FuncMov2Func now has code to remove "mov %reg,%reg" (since it doesn't get removed in Pass 2).

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J. Gareth "Curious Kit" Moreton 2022-10-27 06:50:25 +01:00 committed by FPK
parent 3d805b8a9a
commit a7d1f7d771
1 changed files with 15 additions and 0 deletions
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15
compiler/x86/aoptx86.pas
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@ -2756,6 +2756,21 @@ unit aoptx86;
AllocRegBetween(p_TargetReg, hp2, p, TmpUsedRegs);
end;
RemoveCurrentp(p, hp1);
{ If the Func was another MOV instruction, we might get
"mov %reg,%reg" that doesn't get removed in Pass 2
otherwise, so deal with it here (also do something
similar with lea (%reg),%reg}
if (taicpu(hp2).opcode = A_MOV) and MatchOperand(taicpu(hp2).oper[0]^, taicpu(hp2).oper[1]^.reg) then
begin
DebugMsg(SPeepholeOptimization + 'Mov2Nop 1a done', hp2);
if p = hp2 then
RemoveCurrentp(p)
else
RemoveInstruction(hp2);
end;
Result := True;
Exit;
end;