[llvm-dev] Can I differentiate an imm with an imm used in memory offset in MI pass?
Ryan Taylor via llvm-dev
llvm-dev at lists.llvm.org
Fri Sep 22 06:52:22 PDT 2017
Seems like this information would be readily available in the DAG, at least
in as far as outs and ins?
I just need to check if the inputs are all registers or not. I was looking
at many different ways to do this but basically that's all I need.
On Thu, Sep 21, 2017 at 7:11 PM, Matthias Braun <mbraun at apple.com> wrote:
> The generic code in lib/CodeGen has no knowledge of these semantic
> differences. This knowledge is only available on a per-target basis.
> Typical query functions would be X86InstrInfo::getMemOpBaseRegImmOfs(...)
> or AArch64::getMemOpInfo(...).
> Doing this in a common way accross targets requires callbacks in
> TargetInstrInfo, there seem to be some in that direction but they appear to
> be rarely used so depending on what you want to do you may need to
> implement more of them.
> - Matthias
> > On Sep 21, 2017, at 1:27 PM, Ryan Taylor via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> > So I'd like to be able to tell the difference between an imm and an imm
> used in mem offset in MachineInstr.
> > Or, it would be nice to tell the difference between src and dst operands.
> > I must be missing something trivial?
> > For example,
> > int *b, a;
> > b = a + 2; // is there any marker/flag between 2 and 10 to tell the
> > Thanks.
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