From 4c9cee34f20071a8d08e202afe679e4269f161e2 Mon Sep 17 00:00:00 2001
From: JbR <90027771+jbr-smtg@users.noreply.github.com>
Date: Mon, 6 Feb 2023 16:58:14 +0100
Subject: [PATCH] Fixing issue with ARM64EC and MSVC (#1514)

Co-authored-by: dominic <510002+dmah42@users.noreply.github.com>
---
 src/cycleclock.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/cycleclock.h b/src/cycleclock.h
index df6ffa51..ae1ef2d2 100644
--- a/src/cycleclock.h
+++ b/src/cycleclock.h
@@ -36,7 +36,8 @@
 // declarations of some other intrinsics, breaking compilation.
 // Therefore, we simply declare __rdtsc ourselves. See also
 // http://connect.microsoft.com/VisualStudio/feedback/details/262047
-#if defined(COMPILER_MSVC) && !defined(_M_IX86) && !defined(_M_ARM64)
+#if defined(COMPILER_MSVC) && !defined(_M_IX86) && !defined(_M_ARM64) && \
+    !defined(_M_ARM64EC)
 extern "C" uint64_t __rdtsc();
 #pragma intrinsic(__rdtsc)
 #endif
@@ -114,7 +115,7 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
   // when I know it will work.  Otherwise, I'll use __rdtsc and hope
   // the code is being compiled with a non-ancient compiler.
   _asm rdtsc
-#elif defined(COMPILER_MSVC) && defined(_M_ARM64)
+#elif defined(COMPILER_MSVC) && (defined(_M_ARM64) || defined(_M_ARM64EC))
   // See // https://docs.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics
   // and https://reviews.llvm.org/D53115
   int64_t virtual_timer_value;