VsetModule: fix vlIsVlmax, checking tail should use max(VLMAX, VLEN/S…

…EW) (OpenXiangShan#3135)
ZhengmingHu · Jul 4, 2024 · 7994c93 · 7994c93
1 parent 42d529e
commit 7994c93
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/main/scala/xiangshan/backend/fu/Vsetu.scala b/src/main/scala/xiangshan/backend/fu/Vsetu.scala
@@ -105,7 +105,9 @@ class VsetModule(implicit p: Parameters) extends XSModule {
   outVConfig.vtype.vlmul := Mux(illegal, 0.U, vtype.vlmul)
   outVConfig.vtype.vsew := Mux(illegal, 0.U, vtype.vsew)
 
-  io.out.vlmax := vlmax
+  private val log2VlenDivVsew = log2Vlen.U(3.W) - log2Vsew
+  private val vlenDivVsew = 1.U(vlWidth.W) << log2VlenDivVsew
+  io.out.vlmax := Mux(vlmax >= vlenDivVsew, vlmax, vlenDivVsew)
 
   io.testOut.vlmax := vlmax
   io.testOut.log2Vlmax := log2Vlmax