Stack permutation inefficiency

[mskvortsov]

void foo(int, int, int, int, int, int, int, int,
         int, int, int, int, int, int, int, int,
         int);
void puxc2(int vf, int ve, int vd, int vc, int vb, int va, int v9, int v8,
           int v7, int v6, int v5, int v4, int v3, int v2, int v1, int v0) {
  foo(vf, ve, vd, vc, vb, va, v1, v0, v7, v6, v5, v4, v3, v2, v7, v8, v9);
}

→

  ROLL  15
  ROLL  15
  ROLL  15
  ROLL  15
  ROLL  15
  ROLL  15
  ROLL  7
  ROLL  7
  ROLL  13
  ROLL  13
  ROLL  13
  ROLL  13
  ROLL  13
  ROLL  13
  PUSH  s5
  ROLL  15
  ROLL  16
  CALL  $foo$

Wanted:

PUXC2 s7, s8, s9
CALL $foo$