Implement basic aarch64 struct arg passing ABI

- Missing: vaargs, >2 member HFAs

- Reworked the way stack allocation references are lowered. Now RSTACK
  persists throughout all passes until emit. This allows deferring stack
  frame layouting until the end in a less messy way than before, which
  was emiting frame-pointer relative addresses @ isel time and patching them up
  later in emit to account for actual stack frame layout.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ir_stack.c b/src/ir_stack.c
index ff49805..a9acc61 100644
--- a/src/ir_stack.c
+++ b/src/ir_stack.c
@@ -19,7 +19,7 @@ lowerstack(Function *fn)
             fn->stksiz = alignup(fn->stksiz, 1 << alignlog2);
             if (fn->stksiz > (1<<20)-1) error(NULL, "'%s' stack frame too big", fn->name);
             *ins = mkinstr0(Onop,0);
-            replcuses(mkref(RTMP, t), mkref(RSTACK, fn->stksiz));
+            replcuses(mkref(RTMP, t), mkref(RSTACK, fn->stksiz-siz));
          }
       }
    } while ((blk = blk->lnext) != fn->entry);