From 3dad842181512e3bee18ec1aab2765179fb4ceef Mon Sep 17 00:00:00 2001
From: Eddy Jansson <eddy@klopper.net>
Date: Fri, 15 Nov 2024 17:56:24 +0100
Subject: [PATCH] CPU detection for GCC/clang.

---
 tiny_bvh_speedtest.cpp | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tiny_bvh_speedtest.cpp b/tiny_bvh_speedtest.cpp
index eb2afd2..91bd081 100644
--- a/tiny_bvh_speedtest.cpp
+++ b/tiny_bvh_speedtest.cpp
@@ -9,6 +9,9 @@
 #ifdef _WIN32
 #include <intrin.h>		// for __cpuidex
 #endif
+#ifdef __GNUC__
+#include <cpuid.h>
+#endif
 #ifdef __EMSCRIPTEN__ 
 #include <emscripten/version.h> // for __EMSCRIPTEN_major__, __EMSCRIPTEN_minor__
 #endif
@@ -115,9 +118,15 @@ int main()
 #endif
 
 	// determine what CPU is running the tests.
-#ifdef _WIN32
+#if defined (_WIN32) || defined(__GNUC__)
 	char model[256]{};
-	for (unsigned i = 0; i < 3; ++i) __cpuidex( (int*)(model + i * 16), i + 0x80000002, 0 );
+	for (unsigned i = 0; i < 3; ++i) {
+#ifdef _WIN32
+		__cpuidex( (int*)(model + i * 16), i + 0x80000002, 0 );
+#elif defined __GNUC__
+		__get_cpuid(i + 0x80000002, (unsigned int*)(model+ i * 16 + 0), (unsigned int*)(model + i * 16 + 4), (unsigned int*)(model + i * 16 + 8), (unsigned int*)(model + i * 16 + 12));
+#endif
+	}
 	printf( "running on %s\n", model );
 #endif
 	printf( "----------------------------------------------------------------\n" );