Make host ARM CPU feature detection independent of the vendor

For ARM on linux we use /proc/cpuinfo to detect the host CPU's features.
Linux derives these values without ever looking at the vendor of the
specific CPU implementation. Hence, it adds little value, if we parse
the output of /proc/cpuinfo only for certain vendors.

This patch enables us to derive the correct feature flags e.g. for Qualcomm
CPUs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183790 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 30 deletions

diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index 27c99c8..5a25d12 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -565,41 +565,31 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
   SmallVector<StringRef, 32> Lines;
   Str.split(Lines, "\n");
 
-  // Look for the CPU implementer line.
-  StringRef Implementer;
-  for (unsigned I = 0, E = Lines.size(); I != E; ++I)
-    if (Lines[I].startswith("CPU implementer"))
-      Implementer = Lines[I].substr(15).ltrim("\t :");
-
-  if (Implementer == "0x41") { // ARM Ltd.
-    SmallVector<StringRef, 32> CPUFeatures;
+  SmallVector<StringRef, 32> CPUFeatures;
 
-    // Look for the CPU features.
-    for (unsigned I = 0, E = Lines.size(); I != E; ++I)
-      if (Lines[I].startswith("Features")) {
-        Lines[I].split(CPUFeatures, " ");
-        break;
-      }
-
-    for (unsigned I = 0, E = CPUFeatures.size(); I != E; ++I) {
-      StringRef LLVMFeatureStr = StringSwitch<StringRef>(CPUFeatures[I])
-        .Case("half", "fp16")
-        .Case("neon", "neon")
-        .Case("vfpv3", "vfp3")
-        .Case("vfpv3d16", "d16")
-        .Case("vfpv4", "vfp4")
-        .Case("idiva", "hwdiv-arm")
-        .Case("idivt", "hwdiv")
-        .Default("");
-
-      if (LLVMFeatureStr != "")
-        Features.GetOrCreateValue(LLVMFeatureStr).setValue(true);
+  // Look for the CPU features.
+  for (unsigned I = 0, E = Lines.size(); I != E; ++I)
+    if (Lines[I].startswith("Features")) {
+      Lines[I].split(CPUFeatures, " ");
+      break;
     }
 
-    return true;
+  for (unsigned I = 0, E = CPUFeatures.size(); I != E; ++I) {
+    StringRef LLVMFeatureStr = StringSwitch<StringRef>(CPUFeatures[I])
+      .Case("half", "fp16")
+      .Case("neon", "neon")
+      .Case("vfpv3", "vfp3")
+      .Case("vfpv3d16", "d16")
+      .Case("vfpv4", "vfp4")
+      .Case("idiva", "hwdiv-arm")
+      .Case("idivt", "hwdiv")
+      .Default("");
+
+    if (LLVMFeatureStr != "")
+      Features.GetOrCreateValue(LLVMFeatureStr).setValue(true);
   }
 
-  return false;
+  return true;
 }
 #else
 bool sys::getHostCPUFeatures(StringMap<bool> &Features){