CODEWITHSUNDEEP
fortranllvmclang++llvm-irflang
Paulius Velesko
Paulius Velesko

Reputation: 19

Force function inline in LLVM

I have a function written in fortran:

!function.f90
subroutine ffunc(i, x)
  use iso_c_binding
  implicit none
  integer(c_int), value :: i
  integer(c_int) :: x(*)
  x(1) = i
end

and c function:

extern "C" void cfunction(int i, long* x) {
  x[0] = i;
}

extern "C" void ffunc_(int i, long* x);

extern "C" void bigcall(int i, long* x) {
  ffunc_(i, x);
}

my makefile:

all:
        flang -O2 -S -emit-llvm ./function.f90
        clang++ -O2 -S -emit-llvm ./cfunction.cpp
        llvm-link -S function.ll cfunction.ll -o all.ll
        opt -S --inline  all.ll -o all_opt.ll

I want to translate generate LLVM IR and inline that IR into a C++ function. Everything works except I have to add "alwaysinline" attribute to the fortran IR in order for the opt step to inline in it.

How do I force generation of inline attribute OR how do I force opt to inline function without the attribute present?

Upvotes: 1

Views: 183

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