tcg/arm: explicitely list clobbered/reserved regs

Instead of writing very compact code, declare all registers that are
clobbered or reserved one by one. This makes the code easier to read.

Also declare all the 16 registers to TCG, and mark pc as reserved.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

tcg/arm/tcg-target.c

@@ -39,6 +39,7 @@ static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
     "%r12",
     "%r13",
     "%r14",
+    "%pc",
 };
 #endif
 
@@ -1580,15 +1581,19 @@ void tcg_target_init(TCGContext *s)
         tcg_abort();
 #endif
 
-    tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0,
-                    ((2 << TCG_REG_R14) - 1) & ~(1 << TCG_REG_R8));
+    tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffff);
     tcg_regset_set32(tcg_target_call_clobber_regs, 0,
-                    ((2 << TCG_REG_R3) - 1) |
-                    (1 << TCG_REG_R12) | (1 << TCG_REG_R14));
+                     (1 << TCG_REG_R0) |
+                     (1 << TCG_REG_R1) |
+                     (1 << TCG_REG_R2) |
+                     (1 << TCG_REG_R3) |
+                     (1 << TCG_REG_R12) |
+                     (1 << TCG_REG_R14));
 
     tcg_regset_clear(s->reserved_regs);
     tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
     tcg_regset_set_reg(s->reserved_regs, TCG_REG_R8);
+    tcg_regset_set_reg(s->reserved_regs, TCG_REG_PC);
 
     tcg_add_target_add_op_defs(arm_op_defs);
 }

tcg/arm/tcg-target.h

@@ -44,9 +44,10 @@ enum {
     TCG_REG_R12,
     TCG_REG_R13,
     TCG_REG_R14,
+    TCG_REG_PC,
 };
 
-#define TCG_TARGET_NB_REGS 15
+#define TCG_TARGET_NB_REGS 16
 
 #define TCG_CT_CONST_ARM 0x100