Documentation

Lean.Compiler.IR.ExpandResetReuse

@[inline, reducible]

Mapping from variable to projections

Instances For
    @[inline, reducible]
    Instances For

      Create a mapping from variables to projections. This function assumes variable ids have been normalized

      Instances For

        Return true iff x is consumed in all branches of the current block. Here consumption means the block contains a dec x or reuse x ....

        @[inline, reducible]
        Instances For

          Try to erase inc instructions on projections of y occurring in the tail of bs. Return the updated bs and a bit mask specifying which incs have been removed.

          Instances For

            Replace reuse x ctor ... with ctor ..., and remoce dec x

            replace

            x := reset y; b
            

            with

            inc z_1; ...; inc z_i; dec y; b'
            

            where z_i's are the variables in mask, and b' is b where we removed dec x and replaced reuse x ctor_i ... with ctor_i ....

            Instances For
              @[inline, reducible]
              Instances For

                Given set x[i] := y, return true iff y := proj[i] x

                Instances For

                  Given uset x[i] := y, return true iff y := uproj[i] x

                  Instances For

                    Given sset x[n, i] := y, return true iff y := sproj[n, i] x

                    Instances For

                      Remove unnecessary set/uset/sset operations

                      replace

                      x := reset y; b
                      

                      with

                      let f_i_1 := proj[i_1] y;
                      ...
                      let f_i_k := proj[i_k] y;
                      b'
                      

                      where i_js are the field indexes that the code did not touch immediately before the reset. That is mask[j] == none. b' is b where y dec x is replaced with del y, and z := reuse x ctor_i ws; F is replaced with set x i ws[i] operations, and we replace z with x in F

                      Instances For

                        (Try to) expand reset and reuse instructions.

                        Instances For