vfalu: Use oldVd as input to mgu in last Uop for vfred inst (#3056)

OpenXiangShan · Jun 13, 2024 · b51d5c3 · b51d5c3
1 parent dd46182
commit b51d5c3
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/main/scala/xiangshan/backend/fu/wrapper/VFALU.scala b/src/main/scala/xiangshan/backend/fu/wrapper/VFALU.scala
@@ -421,7 +421,8 @@ class VFAlu(cfg: FuConfig)(implicit p: Parameters) extends VecPipedFuncUnit(cfg)
     val vlMax = Mux(outVecCtrl.vlmul(2), uvlMax >> (-outVecCtrl.vlmul)(1, 0), uvlMax << outVecCtrl.vlmul(1, 0)).asUInt
     vlMax
   }
-  val isOutOldVdForREDO = (outCtrl.fuOpType === VfaluType.vfredosum && outIsFold) || outCtrl.fuOpType === VfaluType.vfwredosum
+  val isLastUopForREDO = outVecCtrl.lastUop
+  val isOutOldVdForREDO = ((outCtrl.fuOpType === VfaluType.vfredosum && outIsFold) || outCtrl.fuOpType === VfaluType.vfwredosum) && !isLastUopForREDO
   val taIsFalseForVFREDO = ((outCtrl.fuOpType === VfaluType.vfredosum) || (outCtrl.fuOpType === VfaluType.vfwredosum)) && (outVecCtrl.vuopIdx =/= numOfUopVFREDOSUM - 1.U)
   // outVecCtrl.fpu.isFpToVecInst means the instruction is float instruction, not vector float instruction
   val notUseVl = outVecCtrl.fpu.isFpToVecInst || (outCtrl.fuOpType === VfaluType.vfmv_f_s)