diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoZb.td b/llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
@@ -650,6 +650,14 @@
 // Pseudo Instructions
 //===----------------------------------------------------------------------===//
 
+let Predicates = [HasStdExtZbpOrZbkb, IsRV32] in {
+def : InstAlias<"zext.h $rd, $rs", (PACK GPR:$rd, GPR:$rs, X0), 0>;
+}
+
+let Predicates = [HasStdExtZbpOrZbkb, IsRV64] in {
+def : InstAlias<"zext.h $rd, $rs", (PACKW GPR:$rd, GPR:$rs, X0), 0>;
+}
+
 let Predicates = [HasStdExtZba, IsRV64] in {
 def : InstAlias<"zext.w $rd, $rs", (ADD_UW GPR:$rd, GPR:$rs, X0)>;
 }