tcg: Remove unused opcodes

We no longer need INDEX_op_end to terminate the list, nor do we
need 5 forms of nop, since we just remove the TCGOp instead.
Reviewed-by: NBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

tcg/tcg-opc.h

@@ -27,15 +27,6 @@
  */
 
 /* predefined ops */
-DEF(end, 0, 0, 0, TCG_OPF_NOT_PRESENT) /* must be kept first */
-DEF(nop, 0, 0, 0, TCG_OPF_NOT_PRESENT)
-DEF(nop1, 0, 0, 1, TCG_OPF_NOT_PRESENT)
-DEF(nop2, 0, 0, 2, TCG_OPF_NOT_PRESENT)
-DEF(nop3, 0, 0, 3, TCG_OPF_NOT_PRESENT)
-
-/* variable number of parameters */
-DEF(nopn, 0, 0, 1, TCG_OPF_NOT_PRESENT)
-
 DEF(discard, 1, 0, 0, TCG_OPF_NOT_PRESENT)
 DEF(set_label, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_NOT_PRESENT)
 

tcg/tcg.c

@@ -1260,7 +1260,7 @@ void tcg_op_remove(TCGContext *s, TCGOp *op)
         s->gen_first_op_idx = next;
     }
 
-    *op = (TCGOp){ .opc = INDEX_op_nop, .next = -1, .prev = -1 };
+    memset(op, -1, sizeof(*op));
 
 #ifdef CONFIG_PROFILER
     s->del_op_count++;
@@ -1385,8 +1385,6 @@ static void tcg_liveness_analysis(TCGContext *s)
             }
             break;
         case INDEX_op_debug_insn_start:
-        case INDEX_op_nop:
-        case INDEX_op_end:
             break;
         case INDEX_op_discard:
             /* mark the temporary as dead */
@@ -2244,7 +2242,7 @@ void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf)
 {
     int i;
 
-    for(i = INDEX_op_end; i < NB_OPS; i++) {
+    for (i = 0; i < NB_OPS; i++) {
         cpu_fprintf(f, "%s %" PRId64 "\n", tcg_op_defs[i].name,
                     tcg_table_op_count[i]);
     }
@@ -2328,7 +2326,6 @@ static inline int tcg_gen_code_common(TCGContext *s,
             tcg_reg_alloc_movi(s, args, dead_args, sync_args);
             break;
         case INDEX_op_debug_insn_start:
-        case INDEX_op_nop:
             break;
         case INDEX_op_discard:
             temp_dead(s, args[0]);

tci.c

@@ -506,19 +506,6 @@ uintptr_t tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr)
         tb_ptr += 2;
 
         switch (opc) {
-        case INDEX_op_end:
-        case INDEX_op_nop:
-            break;
-        case INDEX_op_nop1:
-        case INDEX_op_nop2:
-        case INDEX_op_nop3:
-        case INDEX_op_nopn:
-        case INDEX_op_discard:
-            TODO();
-            break;
-        case INDEX_op_set_label:
-            TODO();
-            break;
         case INDEX_op_call:
             t0 = tci_read_ri(&tb_ptr);
 #if TCG_TARGET_REG_BITS == 32