[llvm] r317229 - [X86] Change getHostCPUName fallback code to not select 'x86-64' for unknown CPUs in family 6 that has 64-bit support but not any newer SSE features. Use 'core2' instead

[Craig Topper via llvm-commits]

Author: ctopper
Date: Thu Nov  2 12:13:32 2017
New Revision: 317229

URL: http://llvm.org/viewvc/llvm-project?rev=317229&view=rev
Log:
[X86] Change getHostCPUName fallback code to not select 'x86-64' for unknown CPUs in family 6 that has 64-bit support but not any newer SSE features. Use 'core2' instead

We know that's the earliest CPU with 64-bit support. x86-64 has taken on a role of representing a more modern 64-bit CPU so we probably shouldn't be using that when we can't identify things.

Modified:
    llvm/trunk/lib/Support/Host.cpp

Modified: llvm/trunk/lib/Support/Host.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Host.cpp?rev=317229&r1=317228&r2=317229&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Host.cpp (original)
+++ llvm/trunk/lib/Support/Host.cpp Thu Nov  2 12:13:32 2017
@@ -794,8 +794,13 @@ getIntelProcessorTypeAndSubtype(unsigned
         break;
       }
       if (Features2 & (1 << (FEATURE_EM64T - 32))) {
-        *Type = INTEL_X86_64;
-        break; // x86-64
+        *Type = INTEL_CORE2; // "core2"
+        *Subtype = INTEL_CORE2_65;
+        break;
+      }
+      if (Features & (1 << FEATURE_SSE3)) {
+        *Type = INTEL_CORE_DUO;
+        break;
       }
       if (Features & (1 << FEATURE_SSE2)) {
         *Type = INTEL_PENTIUM_M;