Started trying to optimize MakePixelWaveData

src/Attributes.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#ifdef __GNUC__
+
+#define ATTRIBUTE_HOT __attribute__((hot))
+
+#else
+
+#define ATTRIBUTE_HOT
+
+#endif

src/Backends/Audio/SDL2.cpp

@@ -10,17 +10,14 @@
 
 #include "../../Organya.h"
 #include "../../WindowsWrapper.h"
+#include "../../Attributes.h"
 
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 #define CLAMP(x, y, z) MIN(MAX((x), (y)), (z))
 
-#ifdef __GNUC__
-#define ATTR_HOT __attribute__((hot))
 #else
 #define ATTR_HOT
-#endif
-
 struct AudioBackend_Sound
 {
 	unsigned char *samples;
@@ -76,8 +73,8 @@ static void SetSoundPan(AudioBackend_Sound *sound, long pan)
 	sound->volume_r = sound->pan_r * sound->volume;
 }
 
-// Most CPU-intensive function in the game (2/3rd CPU time consumption in my experience), so marked with attrHot so the compiler considers it a hot spot (as it is) when optimizing
-ATTR_HOT static void MixSounds(float *stream, unsigned int frames_total)
+// Most CPU-intensive function in the game, so marked with ATTRIBUTE_HOT so the compiler considers it a hot spot (as it is) when optimizing. This alone can reduce the CPU usage of CSE2 by up to 60%
+ATTRIBUTE_HOT static void MixSounds(float *stream, unsigned int frames_total)
 {
 	for (AudioBackend_Sound *sound = sound_list_head; sound != NULL; sound = sound->next)
 	{

src/PixTone.cpp

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "Attributes.h"
 #include "WindowsWrapper.h"
 
 #include "Random.h"
@@ -65,7 +66,7 @@ void MakeWaveTables(void)
 
 //BOOL wave_tables_made;
 
-BOOL MakePixelWaveData(const PIXTONEPARAMETER *ptp, unsigned char *pData)
+ATTRIBUTE_HOT BOOL MakePixelWaveData(const PIXTONEPARAMETER *ptp, unsigned char *pData)
 {
 	int i;
 	int a, b, c, d;