search for: tailjmpr

...86/X86CodeEmitter.cpp (working copy) @@ -601,7 +601,8 @@ if (MO.isMachineBasicBlock()) { emitPCRelativeBlockAddress(MO.getMBB()); } else if (MO.isGlobalAddress()) { - bool NeedStub = !IsStatic || + bool NeedStub = Opcode == X86::TAILJMPd || Opcode == X86::TAILJMPr || + Opcode == X86::TAILJMPm || !IsStatic || (Is64BitMode && TM.getCodeModel() == CodeModel::Large); emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word, 0, 0, NeedStub);

...o insert code into PEI::saveCalleeSavedRegisters to detect that there is a tail called function that uses a callee saved register and move it to another (EAX). that's how the TAILJMP instruction looks: let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1, noResults = 1 in def TAILJMPr : I<0xFF, MRM4r, (ops GR32:$dst), "jmp {*}$dst # TAIL CALL jmpr", []>; btw. i am currently working with llvm-2.0 codebase. thanks for any help regards arnold

...ove) the function pointer to (right before the callee saved register restore) but thinking a little further that's nonsense. something like let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1, noResults = 1, ifDestRegisterisCalleeSavedEmitAMoveToECXAndJumpToThat=1 in def TAILJMPr : I<0xFF, MRM4r, (ops GR32:$dst), "jmp {*}$dst # TAIL CALL jmpr", []>; On 8 Aug 2007, at 18:27, Dale Johannesen wrote: > Inserting a pseudo before your tail call that defines all the callee- > saved > registers should work. See FP_REG_KILL. the trick...

Hello, Arnold. > Is there a way to indicate that the register the tail call > instruction uses as destination needs to be valid after the callee > saved registers have been restored? (some X86InstrInfo.td foo magic > maybe ?) It's wrong way to do the things. Because in this case you either violate the ABI for callee, or you're restricted to do tail call lowering only for

...t; before the callee saved register restore) but thinking a little > further that's nonsense. > > something like > let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1, > noResults = 1, > ifDestRegisterisCalleeSavedEmitAMoveToECXAndJumpToThat=1 > in > def TAILJMPr : I<0xFF, MRM4r, (ops GR32:$dst), "jmp {*}$dst # > TAIL CALL jmpr", > []>; > > On 8 Aug 2007, at 18:27, Dale Johannesen wrote: >> Inserting a pseudo before your tail call that defines all the callee- >> saved >> registers should work....

...9;t this function be "static"? let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in + def TAILJMPd : IBr<0xE9, (ins i32imm:$dst), "jmp\t${dst:call} # TAILCALL", + []>; +let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in + def TAILJMPr : I<0xFF, MRM4r, (outs), (ins GR32:$dst), "jmp{l}\t{*} $dst # TAILCALL", + []>; +let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in def TAILJMPm : I<0xFF, MRM4m, (outs), (ins i32mem:$dst), "jmp\t{*}$dst # TAIL CALL&qu...

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