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+ support the cwd,cdq,cqo and cbw instructions in

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TX86AsmOptimizer.RegLoadedWithNewValue (cwde and cdqe don't need special
  support)

git-svn-id: trunk@36077 -
This commit is contained in:
nickysn 2017-05-04 12:15:40 +00:00
parent 95094e9a8f
commit eac74f5a81
1 changed files with 7 additions and 2 deletions
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9
compiler/x86/aoptx86.pas
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@ -451,8 +451,13 @@ unit aoptx86;
{$ifdef x86_64}
or ((p.opsize=S_Q) and Reg1WriteOverwritesReg2Entirely(NR_RDX,reg))
{$endif x86_64}
)
);
)) or
((p.opcode = A_CWD) and Reg1WriteOverwritesReg2Entirely(NR_DX,reg)) or
((p.opcode = A_CDQ) and Reg1WriteOverwritesReg2Entirely(NR_EDX,reg)) or
{$ifdef x86_64}
((p.opcode = A_CQO) and Reg1WriteOverwritesReg2Entirely(NR_RDX,reg)) or
{$endif x86_64}
((p.opcode = A_CBW) and Reg1WriteOverwritesReg2Entirely(NR_AX,reg) and not(Reg1ReadDependsOnReg2(NR_AL,reg)));
end;