diff --git a/nemu/src/isa/riscv32/inst.c b/nemu/src/isa/riscv32/inst.c
index c8d18d1..81db1ee 100644
--- a/nemu/src/isa/riscv32/inst.c
+++ b/nemu/src/isa/riscv32/inst.c
@@ -116,7 +116,6 @@ static int decode_exec(Decode *s) {
   INSTPAT("0000000 ????? ????? 001 ????? 00100 11", slli   , I, R(rd) = src1 << imm);
   INSTPAT("0000000 ????? ????? 101 ????? 00100 11", srli   , I, R(rd) = src1 >> imm);
   INSTPAT("0100000 ????? ????? 101 ????? 00100 11", srai   , I, R(rd) = (sword_t)src1 >> (imm & 0x01F));
-
   INSTPAT("0000000 00001 00000 000 00000 11100 11", ebreak , N, NEMUTRAP(s->pc, R(10))); // R(10) is $a0
   INSTPAT("??????? ????? ????? ??? ????? ????? ??", inv    , N, INV(s->pc));