Make spin-waiting a little more power efficient on desktop

src/collision.h

@@ -430,4 +430,4 @@ static inline bool Collision_instancesOverlapPrecise(Runner* runner, Instance* a
     }
 
     return false;
-}
+}

src/common.h

@@ -35,3 +35,30 @@
         #define MAYBE_UNUSED
     #endif
 #endif
+
+#ifdef __GNUC__
+    #if defined(__x86_64__) || defined(__i386__) || defined(_M_X64) || defined(_M_IX86)
+        #if ((__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
+            #define YIELD() __asm__ volatile("rep; nop" ::: "memory")
+        #else
+            #include <immintrin.h>
+            #define YIELD() _mm_pause()
+        #endif
+    #elif defined(_M_ARM64) || defined(_M_ARM)
+        #include <intrin.h>
+        #define YIELD() __yield()
+    #elif defined(__aarch64__) || (defined(__arm__) && defined(__ARM_ARCH) && (__ARM_ARCH >= 7))
+        #if (__GNUC__ < 5)
+            #define YIELD() __asm__ volatile("yield" ::: "memory")
+        #else
+            #include <arm_acle.h>
+            #define YIELD() __yield()
+        #endif
+    #elif defined(__riscv)
+        #define YIELD() __asm__ volatile("pause" ::: "memory")
+    #else
+        #define YIELD() ((void)0)
+    #endif
+#else
+    #define YIELD() ((void)0)
+#endif

src/desktop/backends/glfw2.c

@@ -267,5 +267,6 @@ void platformSleepUntil(double time) {
 
     while (platformGetTime() < time) {
         // Spin-wait for the remaining sub-millisecond
+        YIELD();
     }
 }

src/desktop/backends/glfw3.c

@@ -428,5 +428,6 @@ void platformSleepUntil(double time) {
     }
     while (platformGetTime() < time) {
         // Spin-wait for the remaining sub-millisecond
+        YIELD();
     }
 }

src/desktop/backends/sdl1.c

@@ -258,5 +258,6 @@ void platformSleepUntil(double time) {
 
     while (platformGetTime() < time) {
         // Spin-wait for the remaining sub-millisecond
+        YIELD();
     }
 }

src/desktop/backends/sdl2.c

@@ -321,6 +321,7 @@ void platformSleepUntil(double time) {
 
     while (platformGetTime() < time) {
         // Spin-wait for the remaining sub-millisecond
+        YIELD();
     }
 }