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@@ -7131,13 +7131,20 @@ unit aoptx86;
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a CMP instruction if one follows.
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}
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Result := False;
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- if not (cs_opt_size in current_settings.optimizerswitches) and
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- (taicpu(p).opsize in [S_L{$ifdef x86_64}, S_Q{$endif x86_64}]) and
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+ if (taicpu(p).opsize in [S_L{$ifdef x86_64}, S_Q{$endif x86_64}]) and
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MatchOpType(taicpu(p),top_const,top_reg) and
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GetNextInstruction(p, hp1) and
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MatchInstruction(hp1, A_MOV, [taicpu(p).opsize]) and
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(taicpu(hp1).oper[1]^.typ = top_reg) and
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- MatchOperand(taicpu(hp1).oper[0]^, taicpu(p).oper[1]^.reg) then
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+ MatchOperand(taicpu(hp1).oper[0]^, taicpu(p).oper[1]^.reg) and
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+ (
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+ { Don't do SubMov2LeaSub under -Os, but do allow SubMov2Lea }
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+ not (cs_opt_size in current_settings.optimizerswitches) or
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+ (
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+ not RegUsedAfterInstruction(taicpu(p).oper[1]^.reg, hp1, TmpUsedRegs) and
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+ RegUsedAfterInstruction(NR_DEFAULTFLAGS, hp1, TmpUsedRegs)
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+ )
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+ ) then
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begin
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{ Change the MOV instruction to a LEA instruction, and update the
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first operand }
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florian