Implemented Unknown

[libfirm] / ir / be / arm / arm_emitter.c

diff --git a/ir/be/arm/arm_emitter.c b/ir/be/arm/arm_emitter.c
index 4b731e0..f2c4de5 100644 (file)
--- a/ir/be/arm/arm_emitter.c
+++ b/ir/be/arm/arm_emitter.c
@@ -42,6 +42,7 @@
 #include "irprog_t.h"
 #include "irargs_t.h"
 #include "error.h"
+#include "raw_bitset.h"
 
 #include "../besched.h"
 #include "../beblocksched.h"
@@ -77,6 +78,23 @@ static const arch_register_t *get_in_reg(const arch_env_t *arch_env, const ir_no
        reg = arch_get_irn_register(arch_env, op);
 
        assert(reg && "no in register found");
+
+       /* in case of a joker register: just return a valid register */
+       if (arch_register_type_is(reg, joker)) {
+               const arch_register_req_t *req;
+
+               /* ask for the requirements */
+               req = arch_get_register_req(arch_env, irn, pos);
+
+               if (arch_register_req_is(req, limited)) {
+                       /* in case of limited requirements: get the first allowed register */
+                       unsigned idx = rbitset_next(req->limited, 0, 1);
+                       reg = arch_register_for_index(req->cls, idx);
+               } else {
+                       /* otherwise get first register in class */
+                       reg = arch_register_for_index(req->cls, 0);
+               }
+       }
        return reg;
 }