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/t_x86-64_sysv.c b/src/t_x86-64_sysv.c
index 96f40d6..2404a86 100644
--- a/src/t_x86-64_sysv.c
+++ b/src/t_x86-64_sysv.c
@@ -200,7 +200,7 @@ vastart(Function *fn, Block *blk, int *curi)
    int i = *curi + 1;
    insertinstr(blk, i++, mkinstr2(Ostorei64, 0, dst, rsave));
    /* set ap->overflow_arg_area */
-   src = insertinstr(blk, i++, mkinstr2(Oadd, KPTR, mkref(RREG, RBP), mkref(RICON, 16+stk0)));
+   src = insertinstr(blk, i++, mkinstr1(Ocopy, KPTR, mkref(RSTACK, -stk0-8)));
    dst = insertinstr(blk, i++, mkinstr2(Oadd, KPTR, ap, mkref(RICON, 8)));
    insertinstr(blk, i++, mkinstr2(Ostorei64, 0, dst, src));
    /* set ap->gp_offset */