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@@ -2819,8 +2819,8 @@ unit aoptx86;
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if taicpu(p).oper[1]^.typ = top_reg then
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begin
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- { Saves on a large number of dereferences }
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- p_TargetReg := taicpu(p).oper[1]^.reg;
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+ { Saves on a large number of dereferences }
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+ p_TargetReg := taicpu(p).oper[1]^.reg;
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{ Look for:
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mov %reg1,%reg2
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@@ -4613,6 +4613,30 @@ unit aoptx86;
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exit;
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end;
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+ if MatchInstruction(hp1,A_SUB,[Taicpu(p).opsize]) and
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+ MatchOperand(Taicpu(p).oper[1]^,Taicpu(hp1).oper[1]^) and
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+ GetNextInstruction(hp1, hp2) and
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+ MatchInstruction(hp2,A_CMP,[Taicpu(p).opsize]) and
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+ MatchOperand(Taicpu(p).oper[0]^,Taicpu(hp2).oper[1]^) and
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+ MatchOperand(Taicpu(hp1).oper[0]^,Taicpu(hp2).oper[0]^) then
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+ { change
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+
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+ mov reg1,reg2
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+ sub reg3,reg2
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+ cmp reg3,reg1
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+
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+ into
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+
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+ mov reg1,reg2
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+ sub reg3,reg2
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+ }
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+ begin
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+ DebugMsg(SPeepholeOptimization + 'MovSubCmp2MovSub done',p);
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+ RemoveInstruction(hp2);
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+ Result:=true;
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+ exit;
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+ end;
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+
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{
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mov ref,reg0
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<op> reg0,reg1
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florian