1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AArch64/legalize-bug-bogus-cpu.ll b/llvm/test/CodeGen/AArch64/legalize-bug-bogus-cpu.ll
new file mode 100644
index 00000000000..b785a8f045f
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/legalize-bug-bogus-cpu.ll
@@ -0,0 +1,8 @@
+; RUN: llc -march=aarch64 -mcpu=bogus -o - %s
+
+; Fix the bug in PR20557. Set mcpu to a bogus name, llc will crash in type
+; legalization.
+define <4 x float> @fneg4(<4 x float> %x) {
+  %sub = fsub <4 x float> zeroinitializer, %x
+  ret <4 x float> %sub
+}