Changeset 2210cfc for libcfa/src/stdlib.cfa

Timestamp:

Jan 10, 2022, 5:43:42 PM (2 years ago)

Author:

Peter A. Buhr <pabuhr@…>

Branches:

ADT, ast-experimental, enum, forall-pointer-decay, master, pthread-emulation, qualifiedEnum

Children:

c52f033

Parents:

4177592f

Message:

second attempt at specialized PRNG

File:

• libcfa/src/stdlib.cfa (modified) (3 diffs)

libcfa/src/stdlib.cfa

@@ -10 +10 @@
 // Created On       : Thu Jan 28 17:10:29 2016
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Mon Jan  3 09:36:27 2022
-// Update Count     : 519
+// Last Modified On : Mon Jan 10 17:07:21 2022
+// Update Count     : 572
 //
 
 #include "stdlib.hfa"
+//#include "concurrency/kernel/fwd.hfa"
+#include "concurrency/invoke.h"                                                 // random_state
 
 //---------------------------------------
@@ -221 +223 @@
 //---------------------------------------
 
-static uint32_t seed = 0;                                                               // current seed
-static thread_local uint32_t state;                                             // random state
-
-void set_seed( uint32_t seed_ ) { state = seed = seed_; }
-uint32_t get_seed() { return seed; }
-
 #define GENERATOR LCG
 
 inline uint32_t MarsagliaXor( uint32_t & state ) {
-        if ( unlikely( seed == 0 ) ) set_seed( rdtscl() );
-        else if ( unlikely( state == 0 ) ) state = seed;
         state ^= state << 6;
         state ^= state >> 21;
@@ -239 +233 @@
 
 inline uint32_t LCG( uint32_t & state ) {                               // linear congruential generator
-        if ( unlikely( seed == 0 ) ) set_seed( rdtscl() );
-        else if ( unlikely( state == 0 ) ) state = seed;
         return state = 36969 * (state & 65535) + (state >> 16); // 36969 is NOT prime!
 } // LCG
 
+uint32_t __thread_seed = rdtscl();                                              // global thread seed
+
+void set_seed( uint32_t seed ) { __thread_seed = seed; }
+uint32_t get_seed() { return  __thread_seed; }
 uint32_t prng( PRNG & prng ) with( prng ) { callcnt += 1; return GENERATOR( state ); }
 
-uint32_t prng( void ) { return GENERATOR( state ); }
+uint32_t prng( void ) { return GENERATOR( __thread_seed ); } // [0,UINT_MAX]
 
 //---------------------------------------