[llvm-dev] Updating RegMask inline

vivek pandya via llvm-dev llvm-dev at lists.llvm.org
Fri May 27 11:53:48 PDT 2016

On Sat, May 28, 2016 at 12:21 AM, Mehdi Amini <mehdi.amini at apple.com> wrote:

> > On May 27, 2016, at 11:49 AM, vivek pandya <vivekvpandya at gmail.com>
> wrote:
> >
> > Hello Mentors,
> >
> > I have completed writing simple register mask calculator pass, an
> immutable pass that stores RegMasks and provides API to query them, and a
> target specific pass for X86 target which currently iterates through all MI
> in given MF and if a call instruction is found then it quires for RegMask
> to Immutable pass and prints which registers are clobbered and preserved as
> per actual register allocation for callee function.
> >
> > So now I need to update RegMask for call instruction, so as per our
> previous discussion on IRC if we add a method to update RegMask, Do we have
> to do it in target specific way? Is it possible to have RegMask at fixed
> position in Operands array in MI? Also provide some more details on
> updating cached RegMask in various other class.
> Add a method "setOperandMask()" in class MachineOperand, and then when you
> find a call you just walk all the operands till you find one which
> "isRegMask()" at which point you can update it.
> Ok.

> --
> Mehdi
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