diff --git a/llvm/test/CodeGen/RISCV/GlobalISel/legalizer/rv64/legalize-ext.mir b/llvm/test/CodeGen/RISCV/GlobalISel/legalizer/rv64/legalize-ext.mir
new file mode 100644
index 000000000000..a98324ea00ac
--- /dev/null
+++ b/llvm/test/CodeGen/RISCV/GlobalISel/legalizer/rv64/legalize-ext.mir
@@ -0,0 +1,49 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=riscv64 -run-pass=legalizer %s -o - \
+# RUN: | FileCheck %s
+---
+name:            sext_i32
+body:             |
+  bb.0.entry:
+    ; CHECK-LABEL: name: sext_i32
+    ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x10
+    ; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(s64) = COPY $x11
+    ; CHECK-NEXT: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+    ; CHECK-NEXT: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+    ; CHECK-NEXT: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[TRUNC]], [[TRUNC1]]
+    ; CHECK-NEXT: [[SEXT:%[0-9]+]]:_(s64) = G_SEXT [[ADD]](s32)
+    ; CHECK-NEXT: $x10 = COPY [[SEXT]](s64)
+    ; CHECK-NEXT: PseudoRET implicit $x10
+    %0:_(s64) = COPY $x10
+    %1:_(s64) = COPY $x11
+    %2:_(s32) = G_TRUNC %0(s64)
+    %3:_(s32) = G_TRUNC %1(s64)
+    %4:_(s32) = G_ADD %2, %3
+    %5:_(s64) = G_SEXT %4(s32)
+    $x10 = COPY %5(s64)
+    PseudoRET implicit $x10
+
+...
+---
+name:            zext_i32
+body:             |
+  bb.0.entry:
+    ; CHECK-LABEL: name: zext_i32
+    ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x10
+    ; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(s64) = COPY $x11
+    ; CHECK-NEXT: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+    ; CHECK-NEXT: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+    ; CHECK-NEXT: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[TRUNC]], [[TRUNC1]]
+    ; CHECK-NEXT: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT [[ADD]](s32)
+    ; CHECK-NEXT: $x10 = COPY [[ZEXT]](s64)
+    ; CHECK-NEXT: PseudoRET implicit $x10
+    %0:_(s64) = COPY $x10
+    %1:_(s64) = COPY $x11
+    %2:_(s32) = G_TRUNC %0(s64)
+    %3:_(s32) = G_TRUNC %1(s64)
+    %4:_(s32) = G_ADD %2, %3
+    %5:_(s64) = G_ZEXT %4(s32)
+    $x10 = COPY %5(s64)
+    PseudoRET implicit $x10
+
+...