tcg/aarch64: Remove unused code in tcg_out_op

AArch64 defines the TCG_TARGET_HAS_direct_jump. So the "else" block is
useless in the case of "INDEX_op_goto_tb" in function "tcg_out_op". Add
an assertion and delete these codes for clarity.

Suggested-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Qi Hu <huqi@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221017020826.990729-1-huqi@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/aarch64/tcg-target.c.inc

@@ -1916,24 +1916,21 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         break;
 
     case INDEX_op_goto_tb:
-        if (s->tb_jmp_insn_offset != NULL) {
-            /* TCG_TARGET_HAS_direct_jump */
-            /* Ensure that ADRP+ADD are 8-byte aligned so that an atomic
-               write can be used to patch the target address. */
-            if ((uintptr_t)s->code_ptr & 7) {
-                tcg_out32(s, NOP);
-            }
-            s->tb_jmp_insn_offset[a0] = tcg_current_code_size(s);
-            /* actual branch destination will be patched by
-               tb_target_set_jmp_target later. */
-            tcg_out_insn(s, 3406, ADRP, TCG_REG_TMP, 0);
-            tcg_out_insn(s, 3401, ADDI, TCG_TYPE_I64, TCG_REG_TMP, TCG_REG_TMP, 0);
-        } else {
-            /* !TCG_TARGET_HAS_direct_jump */
-            tcg_debug_assert(s->tb_jmp_target_addr != NULL);
-            intptr_t offset = tcg_pcrel_diff(s, (s->tb_jmp_target_addr + a0)) >> 2;
-            tcg_out_insn(s, 3305, LDR, offset, TCG_REG_TMP);
+        tcg_debug_assert(s->tb_jmp_insn_offset != NULL);
+        /*
+         * Ensure that ADRP+ADD are 8-byte aligned so that an atomic
+         * write can be used to patch the target address.
+         */
+        if ((uintptr_t)s->code_ptr & 7) {
+            tcg_out32(s, NOP);
         }
+        s->tb_jmp_insn_offset[a0] = tcg_current_code_size(s);
+        /*
+         * actual branch destination will be patched by
+         * tb_target_set_jmp_target later
+         */
+        tcg_out_insn(s, 3406, ADRP, TCG_REG_TMP, 0);
+        tcg_out_insn(s, 3401, ADDI, TCG_TYPE_I64, TCG_REG_TMP, TCG_REG_TMP, 0);
         tcg_out_insn(s, 3207, BR, TCG_REG_TMP);
         set_jmp_reset_offset(s, a0);
         break;