remove strange init_once/inited checks from arch_init functions. Calling it twice...

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

diff --git a/ir/be/arm/arm_cconv.c b/ir/be/arm/arm_cconv.c
index 287a6dd..88e6638 100644 (file)
--- a/ir/be/arm/arm_cconv.c
+++ b/ir/be/arm/arm_cconv.c
@@ -30,8 +30,17 @@
 #include "typerep.h"
 #include "xmalloc.h"
 #include "error.h"
+#include "util.h"
 
-calling_convention_t *arm_decide_calling_convention(ir_type *function_type)
+static const unsigned ignore_regs[] = {
+       REG_R12,
+       REG_SP,
+       REG_PC,
+       REG_FL,
+};
+
+calling_convention_t *arm_decide_calling_convention(ir_graph *irg,
+                                                    ir_type *function_type)
 {
        int                   stack_offset = 0;
        reg_or_stackslot_t   *params;
@@ -125,6 +134,21 @@ calling_convention_t *arm_decide_calling_convention(ir_type *function_type)
        cconv->param_stack_size = stack_offset;
        cconv->results          = results;
 
+       /* setup allocatable registers */
+       if (irg != NULL) {
+               be_irg_t       *birg      = be_birg_from_irg(irg);
+               size_t          n_ignores = ARRAY_SIZE(ignore_regs);
+               struct obstack *obst      = &birg->obst;
+               size_t          r;
+
+               assert(birg->allocatable_regs == NULL);
+               birg->allocatable_regs = rbitset_obstack_alloc(obst, N_ARM_REGISTERS);
+               rbitset_set_all(birg->allocatable_regs, N_ARM_REGISTERS);
+               for (r = 0; r < n_ignores; ++r) {
+                       rbitset_clear(birg->allocatable_regs, ignore_regs[r]);
+               }
+       }
+
        return cconv;
 }