backend: fix regalloc to work with more complex dataflow

basically an allocation map at the beginning (in) and end (out) of each
block is kept and after the first allocation pass another pass is ran to
resolve allocation conflicts between each edge, plus another pass to
finish lowering phi functions.
also introduced `regset` and plenty of other miscellaneous fixes

1 files changed, 1 insertions, 1 deletions

diff --git a/amd64/isel.c b/amd64/isel.c
index cb87b7d..07115ac 100644
--- a/amd64/isel.c
+++ b/amd64/isel.c
@@ -187,7 +187,7 @@ aadd(struct addr *addr, union ref r)
    } else if (r.t == RREG) {
       /* temporaries are single assignment, but register aren't, so they can't be *
        * safely hoisted into an address value, unless they have global lifetime */
-      if (!bstest(mctarg->rglob, r.i)) return 0;
+      if (!rstest(mctarg->rglob, r.i)) return 0;
    Ref:
       if (!addr->base.bits) addr->base = r;
       else if (!addr->index.bits) addr->index = r;