From 747fc0efaad9438b5f4714845fb6d6960e4d0d60 Mon Sep 17 00:00:00 2001
From: Ani <ani-leo@outlook.com>
Date: Thu, 4 Nov 2021 17:28:24 +0000
Subject: [PATCH] lib/Support: Detect AVX-512 on Alderlake CPUs

---
 lib/Support/Host.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index 7d61b4f41e8..cfbf5765dd5 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -777,13 +777,21 @@ getIntelProcessorTypeAndSubtype(unsigned Family, unsigned Model,
     case 0x8d:
       CPU = "tigerlake";
       *Type = X86::INTEL_COREI7;
+      *Subtype = X86::INTEL_COREI7_TIGERLAKE;
       break;
 
     // Alderlake:
     case 0x97:
     case 0x9a:
-      CPU = "alderlake";
       *Type = X86::INTEL_COREI7;
+      // Alderlake has AVX-512 when the E-cores are disabled
+      if (testFeature(X86::FEATURE_AVX512VBMI2)) {
+        CPU = "rocketlake";
+        *Subtype = X86::INTEL_COREI7_ROCKETLAKE;
+      } else {
+        CPU = "alderlake";
+        *Subtype = X86::INTEL_COREI7_ALDERLAKE;
+      }
       break;
 
     // Icelake Xeon: