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@@ -5626,6 +5626,57 @@ unit aoptx86;
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RemoveInstruction(hp1);
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end;
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end
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+ else if reg_and_hp1_is_instr and
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+ (taicpu(hp1).opcode = A_MOV) and
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+ MatchOpType(taicpu(hp1),top_reg,top_reg) and
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+ (((taicpu(p).opsize in [S_BW,S_BL,S_WL{$ifdef x86_64},S_BQ,S_WQ,S_LQ{$endif x86_64}]) and
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+ (taicpu(hp1).opsize=S_B)) or
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+ ((taicpu(p).opsize in [S_WL{$ifdef x86_64},S_WQ,S_LQ{$endif x86_64}]) and
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+ (taicpu(hp1).opsize=S_W))
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+{$ifdef x86_64}
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+ or ((taicpu(p).opsize=S_LQ) and
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+ (taicpu(hp1).opsize=S_L))
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+{$endif x86_64}
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+ ) and
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+ SuperRegistersEqual(taicpu(p).oper[1]^.reg,taicpu(hp1).oper[0]^.reg) then
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+ begin
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+ { change
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+ movx %reg1,%reg2
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+ mov %reg2,%reg3
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+ dealloc %reg2
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+
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+ into
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+
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+ mov %reg1,%reg3
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+
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+ if the second mov accesses only the bits stored in reg1
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+ }
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+ TransferUsedRegs(TmpUsedRegs);
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+ UpdateUsedRegs(TmpUsedRegs, tai(p.next));
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+ if not(RegUsedAfterInstruction(taicpu(p).oper[1]^.reg,hp1,TmpUsedRegs)) then
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+ begin
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+ DebugMsg(SPeepholeOptimization + 'MovxMov2Mov',p);
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+ if taicpu(p).oper[0]^.typ=top_reg then
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+ begin
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+ case taicpu(hp1).opsize of
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+ S_B:
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+ taicpu(hp1).loadreg(0,newreg(R_INTREGISTER,getsupreg(taicpu(p).oper[0]^.reg),R_SUBL));
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+ S_W:
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+ taicpu(hp1).loadreg(0,newreg(R_INTREGISTER,getsupreg(taicpu(p).oper[0]^.reg),R_SUBW));
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+ S_L:
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+ taicpu(hp1).loadreg(0,newreg(R_INTREGISTER,getsupreg(taicpu(p).oper[0]^.reg),R_SUBD));
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+ else
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+ Internalerror(2020102301);
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+ end;
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+ AllocRegBetween(taicpu(hp1).oper[0]^.reg,p,hp1,UsedRegs);
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+ end
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+ else
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+ taicpu(hp1).loadref(0,taicpu(p).oper[0]^.ref^);
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+ RemoveCurrentP(p);
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+ result:=true;
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+ exit;
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+ end;
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+ end
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else if reg_and_hp1_is_instr and
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(taicpu(p).oper[0]^.typ = top_reg) and
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(
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florian