Define getHostCPUFeatures for Windows on ARM64 platform

This change implements getHostCPUFeatures function to enable this functionality on Windows on ARM64. This was committed to llvm at https://reviews.llvm.org/D68139 . Bug: chromium:893460 Change-Id: I7ae62f298683979a4ab1aa8099d6e91706b15c9b Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37328 Presubmit-Ready: Alexis Hétu <sugoi@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Alexis Hétu <sugoi@google.com> Tested-by: Alexis Hétu <sugoi@google.com>

Define getHostCPUFeatures for Windows on ARM64 platform
ebe5dcf0 · Tibor Dusnoki · Alexis Hétu · 520ed228 · ebe5dcf0
Commit ebe5dcf0 authored Oct 15, 2019 by Tibor Dusnoki Committed by Alexis Hétu Oct 16, 2019
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Host.cpp third_party/llvm-7.0/llvm/lib/Support/Host.cpp +11 -0

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--- a/third_party/llvm-7.0/llvm/lib/Support/Host.cpp
+++ b/third_party/llvm-7.0/llvm/lib/Support/Host.cpp
@@ -1358,6 +1358,17 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
  return true;
 }
+#elif defined(_WIN32) && (defined(__aarch64__) || defined(_M_ARM64))
+bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
+  if (IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE))
+    Features["neon"] = true;
+  if (IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE))
+    Features["crc"] = true;
+  if (IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE))
+    Features["crypto"] = true;
+  return true;
+}
 #else
 bool sys::getHostCPUFeatures(StringMap<bool> &Features) { return false; }
 #endif