Merge pull request #483 from RISCVERS/fix-div-redirect

div: don't accept new request when it's cancelled

src/main/scala/xiangshan/backend/fu/Radix2Divider.scala

@@ -41,7 +41,7 @@ class Radix2Divider(len: Int) extends AbstractDivider(len) {
   val uopReg = RegEnable(uop, newReq)
 
   val cnt = Counter(len)
-  when (newReq) {
+  when (newReq && !io.in.bits.uop.roqIdx.needFlush(io.redirectIn)) {
     state := s_log2
   } .elsewhen (state === s_log2) {
     // `canSkipShift` is calculated as following:

src/main/scala/xiangshan/backend/fu/SRT4Divider.scala

@@ -37,7 +37,9 @@ class SRT4Divider(len: Int) extends AbstractDivider(len) {
 
   switch(state){
     is(s_idle){
-      when(io.in.fire()){ state := Mux(divZero, s_finish, s_lzd) }
+      when (io.in.fire() && !io.in.bits.uop.roqIdx.needFlush(io.redirectIn)) {
+        state := Mux(divZero, s_finish, s_lzd)
+      }
     }
     is(s_lzd){ // leading zero detection
       state := s_normlize