[llvm-dev] Updating RegMask inline

vivek pandya via llvm-dev llvm-dev at lists.llvm.org
Fri May 27 18:55:13 PDT 2016

On Sat, May 28, 2016 at 12:23 AM, vivek pandya <vivekvpandya at gmail.com>

> 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.

Is it ok to add "setRegMaskOperand()" in class MI and looping through
operands to find RegMask is also included in method ?

> -Vivek
>> --
>> Mehdi
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