Index: include/llvm/Support/X86TargetParser.def
===================================================================
--- include/llvm/Support/X86TargetParser.def
+++ include/llvm/Support/X86TargetParser.def
@@ -67,6 +67,7 @@
 X86_CPU_TYPE                  ("athlon-xp",   AMD_ATHLON_XP)
 X86_CPU_TYPE                  ("k8",          AMD_K8)
 X86_CPU_TYPE                  ("k8-sse3",     AMD_K8SSE3)
+X86_CPU_TYPE                  ("common-avx512", INTEL_COMMON_AVX512)
 #undef X86_CPU_TYPE_COMPAT_WITH_ALIAS
 #undef X86_CPU_TYPE_COMPAT
 #undef X86_CPU_TYPE
Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -862,6 +862,17 @@
 def : SkylakeServerProc<"skylake-avx512">;
 def : SkylakeServerProc<"skx">; // Legacy alias.
 
+// Fake CPU to represent the intersection between SKX and KNL. Matches
+// icc's -xCOMMON-AVX512. BDW ISA + AVX512F + AVX512CD.
+class CommonAVX512Proc<string Name> : ProcModel<Name, BroadwellModel,
+                                                BDWFeatures.Value, [
+  FeatureAVX512,
+  FeatureCDI,
+  FeaturePOPCNTFalseDeps,
+  FeatureLZCNTFalseDeps
+]>;
+def : CommonAVX512Proc<"common-avx512">;
+
 def CNLFeatures : ProcessorFeatures<SKLFeatures.Value, [
   FeatureAVX512,
   FeatureCDI,
Index: test/CodeGen/X86/cpus-intel.ll
===================================================================
--- test/CodeGen/X86/cpus-intel.ll
+++ test/CodeGen/X86/cpus-intel.ll
@@ -46,6 +46,7 @@
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=tremont 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=knl 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 ; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=knm 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
+; RUN: llc < %s -o /dev/null -mtriple=x86_64-unknown-unknown -mcpu=common-avx512 2>&1 | FileCheck %s --check-prefix=CHECK-NO-ERROR --allow-empty
 
 define void @foo() {
   ret void