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+ support testing for individual bits from the x86 flags register in i386's

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TCpuAsmOptimizer.RegReadByInstruction()

git-svn-id: trunk@35956 -
This commit is contained in:
nickysn 2017-04-26 14:38:36 +00:00
parent c8487c4150
commit 618b6292ee
1 changed files with 27 additions and 5 deletions
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32
compiler/i386/aoptcpu.pas
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@ -233,12 +233,34 @@ unit aoptcpu;
exit
end;
end;
if ([Ch_RCarryFlag,Ch_RParityFlag,Ch_RAuxiliaryFlag,Ch_RZeroFlag,Ch_RSignFlag,Ch_ROverflowFlag,
Ch_RWCarryFlag,Ch_RWParityFlag,Ch_RWAuxiliaryFlag,Ch_RWZeroFlag,Ch_RWSignFlag,Ch_RWOverflowFlag,
Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[]) and (reg=NR_DEFAULTFLAGS) then
if SuperRegistersEqual(reg,NR_DEFAULTFLAGS) then
begin
RegReadByInstruction := true;
exit
case getsubreg(reg) of
R_SUBW,R_SUBD,R_SUBQ:
RegReadByInstruction :=
[Ch_RCarryFlag,Ch_RParityFlag,Ch_RAuxiliaryFlag,Ch_RZeroFlag,Ch_RSignFlag,Ch_ROverflowFlag,
Ch_RWCarryFlag,Ch_RWParityFlag,Ch_RWAuxiliaryFlag,Ch_RWZeroFlag,Ch_RWSignFlag,Ch_RWOverflowFlag,
Ch_RDirFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGCARRY:
RegReadByInstruction:=[Ch_RCarryFlag,Ch_RWCarryFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGPARITY:
RegReadByInstruction:=[Ch_RParityFlag,Ch_RWParityFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGAUXILIARY:
RegReadByInstruction:=[Ch_RAuxiliaryFlag,Ch_RWAuxiliaryFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGZERO:
RegReadByInstruction:=[Ch_RZeroFlag,Ch_RWZeroFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGSIGN:
RegReadByInstruction:=[Ch_RSignFlag,Ch_RWSignFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGOVERFLOW:
RegReadByInstruction:=[Ch_ROverflowFlag,Ch_RWOverflowFlag,Ch_RFlags,Ch_RWFlags,Ch_RFLAGScc]*Ch<>[];
R_SUBFLAGINTERRUPT:
RegReadByInstruction:=[Ch_RFlags,Ch_RWFlags]*Ch<>[];
R_SUBFLAGDIRECTION:
RegReadByInstruction:=[Ch_RDirFlag,Ch_RFlags,Ch_RWFlags]*Ch<>[];
else
internalerror(2017042601);
end;
exit;
end;
if (Ch_NoReadIfEqualRegs in Ch) and (p.ops=2) and
(p.oper[0]^.typ=top_reg) and (p.oper[1]^.typ=top_reg) and