[llvm-dev] Replace "ret" with "pop+jump"

[Craig Topper via llvm-dev]

You might be able to just check for the return instruction in
X86AsmPrinter::EmitInstruction where we convert from MachineInstr to
MCInst. You can change it to a POP and a JUMP MCInst.

~Craig


On Wed, Aug 8, 2018 at 8:31 PM mayuyu.io via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> IndirectBr only works for Branch instructions, not ret.
> The latter one seems likely however I’m no where near a backend expert so
> I could be wrong : (
>
> Zhang
>
> > 在 2018年8月9日，11:23，PenYiWang via llvm-dev <llvm-dev at lists.llvm.org> 写道：
> >
> > Hi
> >
> > I want to replace all the return instructions in the program with pop
> <reg>; jmp <reg>.
> >
> > Should I use  IRBuilder in LLVM IR level?
> >
> > I found that there is a IRBuilder::CreateIndirectBr
> >
> > Or Should I modify the code in lib/Target/X86/X86ISelLowering.cpp in
> backend ?
> >
> > I found that there is a X86TargetLowering::LowerCall
> >
> > Which is better?
> >
> > Thanks
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> > llvm-dev at lists.llvm.org
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>
>
>
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