pprof: workaround for MMSP2 timer glitch, add draw2

[libpicofe.git] / linux / pprof.h

diff --git a/linux/pprof.h b/linux/pprof.h
index 88a97e3..cccbcbd 100644 (file)
--- a/linux/pprof.h
+++ b/linux/pprof.h
@@ -28,11 +28,14 @@ static __attribute__((always_inline)) inline unsigned int pprof_get_one(void)
   __asm__ __volatile__ ("rdtsc" : "=A" (ret));
   return (unsigned int)ret;
 }
+#define unglitch_timer(x)
 
 #elif defined(__GP2X__)
-// XXX: MMSP2 only
+// XXX: MMSP2 only, timer sometimes seems to return lower vals?
 extern volatile unsigned long *gp2x_memregl;
 #define pprof_get_one() (unsigned int)gp2x_memregl[0x0a00 >> 2]
+#define unglitch_timer(di) \
+  if ((signed int)(di) < 0) di = 0
 
 #else
 #error no timer
@@ -40,12 +43,22 @@ extern volatile unsigned long *gp2x_memregl;
 
 #define pprof_start(point) { \
     unsigned int pp_start_##point = pprof_get_one()
+
 #define pprof_end(point) \
-    pp_counters->counter[pp_##point] += pprof_get_one() - pp_start_##point; \
+    { \
+      unsigned int di = pprof_get_one() - pp_start_##point; \
+      unglitch_timer(di); \
+      pp_counters->counter[pp_##point] += di; \
+    } \
   }
+
 // subtract for recursive stuff
 #define pprof_end_sub(point) \
-    pp_counters->counter[pp_##point] -= pprof_get_one() - pp_start_##point; \
+    { \
+      unsigned int di = pprof_get_one() - pp_start_##point; \
+      unglitch_timer(di); \
+      pp_counters->counter[pp_##point] -= di; \
+    } \
   }
 
 extern void pprof_init(void);