Add vendor identity check for Hygon Dhyana processor in Scudo
Summary:
The Hygon Dhyana processor supports hardware CRC32.
Related link:
https://reviews.llvm.org/D78874
Result of "make check":
Testing Time: 1364.04s
Unsupported Tests: 317
Expected Passes : 36802
Expected Failures: 161
[100%] Built target check-llvm
[100%] Built target check
Reviewers: cryptoad
Reviewed By: cryptoad
Subscribers: craig.topper, cryptoad, cfe-commits, #sanitizers, llvm-commits
Tags: #clang, #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D62368
diff --git a/compiler-rt/lib/scudo/standalone/checksum.cpp b/compiler-rt/lib/scudo/standalone/checksum.cpp
index 5de049a..05d4ba5 100644
--- a/compiler-rt/lib/scudo/standalone/checksum.cpp
+++ b/compiler-rt/lib/scudo/standalone/checksum.cpp
@@ -31,6 +31,13 @@
#define bit_SSE4_2 bit_SSE42 // clang and gcc have different defines.
#endif
+#ifndef signature_HYGON_ebx // They are not defined in gcc.
+// HYGON: "HygonGenuine".
+#define signature_HYGON_ebx 0x6f677948
+#define signature_HYGON_edx 0x6e65476e
+#define signature_HYGON_ecx 0x656e6975
+#endif
+
bool hasHardwareCRC32() {
u32 Eax, Ebx = 0, Ecx = 0, Edx = 0;
__get_cpuid(0, &Eax, &Ebx, &Ecx, &Edx);
@@ -39,7 +46,10 @@
(Ecx == signature_INTEL_ecx);
const bool IsAMD = (Ebx == signature_AMD_ebx) && (Edx == signature_AMD_edx) &&
(Ecx == signature_AMD_ecx);
- if (!IsIntel && !IsAMD)
+ const bool IsHygon = (Ebx == signature_HYGON_ebx) &&
+ (Edx == signature_HYGON_edx) &&
+ (Ecx == signature_HYGON_ecx);
+ if (!IsIntel && !IsAMD && !IsHygon)
return false;
__get_cpuid(1, &Eax, &Ebx, &Ecx, &Edx);
return !!(Ecx & bit_SSE4_2);
