diff --git a/llvm/test/CodeGen/X86/prefer-fpext-splat.ll b/llvm/test/CodeGen/X86/prefer-fpext-splat.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/X86/prefer-fpext-splat.ll
@@ -0,0 +1,17 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512f,+avx512vl | FileCheck %s
+
+define <4 x double> @prefer(float* %p) {
+; CHECK-LABEL: prefer:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vmovss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; CHECK-NEXT:    vcvtss2sd %xmm0, %xmm0, %xmm0
+; CHECK-NEXT:    vbroadcastsd %xmm0, %ymm0
+; CHECK-NEXT:    retq
+entry:
+  %0 = load float, float* %p, align 4
+  %vecinit.i = insertelement <4 x float> undef, float %0, i64 0
+  %vecinit3.i = shufflevector <4 x float> %vecinit.i, <4 x float> poison, <4 x i32> zeroinitializer
+  %conv.i = fpext <4 x float> %vecinit3.i to <4 x double>
+  ret <4 x double> %conv.i
+}