Fixed overflow issue. Code originally meant to truncate the 64 bit integer did not work as assembler doesn't "cast" variables like C does. get_cycles() was passing the memory address of a 32 bit unsigned int to the x86 call which required 64 bits of storage space. The extra 32 bits corrupted whatever was on the stack next to the variable.

git-svn-id: svn://localhost/ardour2/branches/3.0@3793 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/cycles.h

@@ -48,10 +48,10 @@ extern cycles_t cacheflush_time;
 
 static inline cycles_t get_cycles (void)
 {
-	uint32_t long ret;
+	cycles_t ret;
 
 	rdtscll(ret);
-	return ret;
+	return ret & 0xffffffff;
 }
 
 #elif defined(__powerpc__)