diff --git a/emul_inst_decipher.c b/emul_inst_decipher.c
index 2e39d0e..b05c629 100644
--- a/emul_inst_decipher.c
+++ b/emul_inst_decipher.c
@@ -99,11 +99,11 @@
 void emul_inst_dec_update_pc() {
     int pc;
     // プログラムカウンタ取得
-    pc = emul_reg_get(emul_inst_dec_get_operand("$pc\0"));
+    pc = emul_reg_get(Spc);
     // 呼び出すアドレスにプログラムカウンタを設定
     emul_inst_dec_set_pc(pc);
     // プログラムカウンタをインクリメント
-    emul_reg_set(emul_inst_dec_get_operand("$pc\0"), pc+1);
+    emul_reg_set(Spc, pc+1);
 }
 
 int emul_inst_dec_load(const char *filename) {
diff --git a/emul_inst_exec.c b/emul_inst_exec.c
index eda7199..7c8dafa 100644
--- a/emul_inst_exec.c
+++ b/emul_inst_exec.c
@@ -232,7 +232,7 @@
         emul_inst_dec_get_token(label);
         emul_inst_exec_pseudo_label(
             label,
-            emul_reg_get(emul_inst_dec_get_operand("$pc\0"))
+            emul_reg_get(Spc)
         );
         break;
     //case RUN:
@@ -405,7 +405,7 @@
 int emul_inst_exec_run() {
     // step関数を終わるまで呼び出せばよい
     int exit_code;
-    while ( exit_code = emul_inst_exec_step() );
+    while ( (exit_code = emul_inst_exec_step()) );
     return exit_code;
 }
 
diff --git a/emul_reg.h b/emul_reg.h
index c29eac5..bd5cd73 100644
--- a/emul_reg.h
+++ b/emul_reg.h
@@ -1,7 +1,7 @@
 #ifndef EMUL_REG__
 #define EMUL_REG__
 
-#define REG_SIZE 31
+#define REG_SIZE 32
 typedef enum {
     // 翻訳のための擬似オペランド
     OPERAND_DECODE_ERROR,
diff --git a/test_asm/test.asm b/test_asm/test.asm
index ebf1e94..8ac6197 100644
--- a/test_asm/test.asm
+++ b/test_asm/test.asm
@@ -9,3 +9,10 @@
 :REGCAT $s0
 slti $t0 $s0 10
 bne $t0 $zero LOOP
+
+addi $s0 $zero 0
+:LABEL LOOP1
+addi $s0 $s0 1
+:REGCAT $s0
+slti $t0 $s0 10
+bne $t0 $zero LOOP1