[cadcdev-svn-commits] [SCM] branch master updated. 9ced3a9b8b3f0cbbce7c5c1dc83cfa9376fa3e7d

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- Log -----------------------------------------------------------------
commit 9ced3a9b8b3f0cbbce7c5c1dc83cfa9376fa3e7d
Author: Paul Cercueil <pa...@cr...>
Date:   Mon Oct 21 07:15:35 2024 +0200

    perf_monitor: Add macro for branch likeliness analysis (#826)
    
    Introduce a new perf_monitor_if() macro.
    
    This macro is designed to be used inside an "if" expression, for instance:
    
      if (perf_monitor_if(!strcmp("test", str))) {
         ...
      }
    
    The resulting performance monitor will measure the number of calls, and
    the number of times the branch was taken (in event1) and the number of
    time it was not (in event0).
    
    Signed-off-by: Paul Cercueil <pa...@cr...>

-----------------------------------------------------------------------

Summary of changes:
 kernel/arch/dreamcast/include/dc/perf_monitor.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/kernel/arch/dreamcast/include/dc/perf_monitor.h b/kernel/arch/dreamcast/include/dc/perf_monitor.h
index cdf20cdf..20617623 100644
--- a/kernel/arch/dreamcast/include/dc/perf_monitor.h
+++ b/kernel/arch/dreamcast/include/dc/perf_monitor.h
@@ -59,6 +59,15 @@ struct perf_monitor *__start_perf_monitor(struct perf_monitor *monitor);
         __start_perf_monitor(&__perf_monitor_##l)
 
 #define _perf_monitor(f, l) __perf_monitor(f, l)
+
+#define __perf_monitor_if(f, l, tst) ({ \
+    static struct perf_monitor __perf_monitor_##l \
+        __attribute__((section(".monitors"))) = { f, l, }; \
+    __perf_monitor_##l.calls++; \
+    (tst) ? (__perf_monitor_##l.event1++,1) : (__perf_monitor_##l.event0++,0); \
+})
+
+#define _perf_monitor_if(f, l, tst) __perf_monitor_if(f, l, tst)
 /** /endcond */
 
 /** \brief  Register a performance monitor in the current functional block
@@ -68,6 +77,20 @@ struct perf_monitor *__start_perf_monitor(struct perf_monitor *monitor);
 */
 #define perf_monitor() _perf_monitor(__func__, __LINE__)
 
+/** \brief  Register a performance monitor for branch likeliness analysis
+
+    This macro is designed to be used inside an "if" expression, for instance:
+    if (perf_monitor_if(!strcmp("test", str))) { ... }
+
+    The resulting performance monitor will measure the number of calls, and
+    the number of times the branch was taken (in event1) and the number of
+    time it was not (in event0).
+
+    \param  tst             The boolean expression that is normally used inside
+                            the "if" check
+*/
+#define perf_monitor_if(tst) _perf_monitor_if(__func__, __LINE__, tst)
+
 /** \brief  Initialize the performance monitor system
 
     Set up the performance monitor system. Note that using the performance


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