1 files changed, 9 insertions, 3 deletions
diff --git a/ssa.c b/ssa.c
index 4a4ed4d..fc4464b 100644
--- a/ssa.c
+++ b/ssa.c
@@ -12,11 +12,17 @@ copyopt(struct function *fn)
          struct use *use, *uend;
          union ref var = mkref(RTMP, blk->ins.p[i]);
          struct instr *ins = &instrtab[var.i];
+         enum irclass k;
 
          if (ins->op == Ocopy) {
-            assert(ins->l.t != RREG);
-
-            replcuses(var, ins->l);
+            union ref arg = ins->l;
+            if (arg.t == RTMP) k = insrescls(instrtab[arg.i]);
+            else if (arg.t == RICON) k = cls2siz[ins->cls] == 4 ? KI4 : KI8;
+            else if (arg.t == RXCON) k = isnumcon(arg) ? conht[arg.i].cls : KPTR;
+            else assert(0);
+            if (ins->cls != k) continue;
+
+            replcuses(var, arg);
             *ins = mkinstr(Onop,0,);
             deluses(var.i);
          }