[PATCH v2 06/22] sim/erc32: Fix incorrect simulator performance report

[Jiri Gaisler <jiri@gaisler.se>]

	* func.c (reset_stat, show_stat) switch to double in time keeping
	(get_time) new function to get system time
	* sis.h Likewise
	* interf.c (run_sim) use get_time() for system time
	* sis.c (run_sim) Likewise
---
 sim/erc32/func.c   | 35 ++++++++++++++++++++++++++---------
 sim/erc32/interf.c |  5 ++---
 sim/erc32/sis.c    |  5 ++---
 sim/erc32/sis.h    |  5 +++--
 4 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/sim/erc32/func.c b/sim/erc32/func.c
index 6526085..06c00b4 100644
--- a/sim/erc32/func.c
+++ b/sim/erc32/func.c
@@ -613,7 +613,7 @@ void
 reset_stat(sregs)
     struct pstate  *sregs;
 {
-    sregs->tottime = 0;
+    sregs->tottime = 0.0;
     sregs->pwdtime = 0;
     sregs->ninst = 0;
     sregs->fholdt = 0;
@@ -632,9 +632,10 @@ show_stat(sregs)
     struct pstate  *sregs;
 {
     uint32          iinst;
-    uint32          stime, tottime;
+    uint32          stime;
 
-    if (sregs->tottime == 0) tottime = 1; else tottime = sregs->tottime;
+    if (sregs->tottime == 0.0)
+        sregs->tottime += 1E-6;
     stime = ebase.simtime - sregs->simstart;	/* Total simulated time */
 #ifdef STAT
 
@@ -669,12 +670,15 @@ show_stat(sregs)
 	   sregs->freq * (float) (sregs->ninst - sregs->finst) /
 	   (float) (stime - sregs->pwdtime),
      sregs->freq * (float) sregs->finst / (float) (stime - sregs->pwdtime));
-    printf(" Simulated ERC32 time        : %5.2f ms\n", (float) (ebase.simtime - sregs->simstart) / 1000.0 / sregs->freq);
-    printf(" Processor utilisation       : %5.2f %%\n", 100.0 * (1.0 - ((float) sregs->pwdtime / (float) stime)));
-    printf(" Real-time / simulator-time  : 1/%.2f \n",
-      ((float) sregs->tottime) / ((float) (stime) / (sregs->freq * 1.0E6)));
-    printf(" Simulator performance       : %d KIPS\n",sregs->ninst/tottime/1000);
-    printf(" Used time (sys + user)      : %3d s\n\n", sregs->tottime);
+    printf(" Simulated ERC32 time        : %.2f s\n",
+        (float) (ebase.simtime - sregs->simstart) / 1000000.0 / sregs->freq);
+    printf(" Processor utilisation       : %.2f %%\n",
+        100.0 * (1.0 - ((float) sregs->pwdtime / (float) stime)));
+    printf(" Real-time performance       : %.2f %%\n",
+        100.0 / (sregs->tottime / ((double) (stime) / (sregs->freq * 1.0E6))));
+    printf(" Simulator performance       : %.2f MIPS\n",
+        (double)(sregs->ninst) / sregs->tottime / 1E6);
+    printf(" Used time (sys + user)      : %.2f s\n\n", sregs->tottime);
 }
 
 
@@ -1128,3 +1132,16 @@ bfd_load(fname)
 
     return(bfd_get_start_address (pbfd));
 }
+
+
+double get_time (void)
+{
+    double usec;
+
+    struct timeval tm;
+
+    gettimeofday (&tm, NULL);
+    usec = ((double) tm.tv_sec) * 1E6 + ((double) tm.tv_usec);
+    return (usec / 1E6);
+
+}
diff --git a/sim/erc32/interf.c b/sim/erc32/interf.c
index 9ac455f..38a2a0d 100644
--- a/sim/erc32/interf.c
+++ b/sim/erc32/interf.c
@@ -24,7 +24,6 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
 #include <sys/fcntl.h>
 #include "sis.h"
 #include "libiberty.h"
@@ -76,7 +75,7 @@ run_sim(sregs, icount, dis)
 	(*sim_callback->printf_filtered) (sim_callback, "resuming at %x\n",
 					  sregs->pc);
    init_stdio();
-   sregs->starttime = time(NULL);
+   sregs->starttime = get_time();
    irq = 0;
    if ((sregs->pc != 0) && (ebase.simtime == 0)) boot_init();
    while (!sregs->err_mode & (icount > 0)) {
@@ -142,7 +141,7 @@ run_sim(sregs, icount, dis)
 	}
     }
     sim_halt();
-    sregs->tottime += time(NULL) - sregs->starttime;
+    sregs->tottime += get_time() - sregs->starttime;
     restore_stdio();
     clearerr(stdin);
     if (sregs->err_mode)
diff --git a/sim/erc32/sis.c b/sim/erc32/sis.c
index 89e6f02..f2aed78 100644
--- a/sim/erc32/sis.c
+++ b/sim/erc32/sis.c
@@ -26,7 +26,6 @@
 #include <stdlib.h>
 #endif
 #include <stdio.h>
-#include <time.h>
 #include <sys/fcntl.h>
 #include "sis.h"
 #include <dis-asm.h>
@@ -86,7 +85,7 @@ run_sim(sregs, icount, dis)
 {
     int             irq, mexc, deb, asi;
 
-    sregs->starttime = time(NULL);
+    sregs->starttime = get_time();
     init_stdio();
     if (sregs->err_mode) icount = 0;
     deb = dis || sregs->histlen || sregs->bptnum;
@@ -146,7 +145,7 @@ run_sim(sregs, icount, dis)
 	    if (sregs->tlimit <= ebase.simtime) sregs->tlimit = -1;
 	}
     }
-    sregs->tottime += time(NULL) - sregs->starttime;
+    sregs->tottime += get_time() - sregs->starttime;
     restore_stdio();
     if (sregs->err_mode)
 	return (ERROR);
diff --git a/sim/erc32/sis.h b/sim/erc32/sis.h
index f49d45d..dc02c65 100644
--- a/sim/erc32/sis.h
+++ b/sim/erc32/sis.h
@@ -110,14 +110,14 @@ struct pstate {
     float32         freq;	/* Simulated processor frequency */
 
 
-    uint64          tottime;
+    double          tottime;
     uint64          ninst;
     uint64          fholdt;
     uint64          holdt;
     uint64          icntt;
     uint64          finst;
     uint64          simstart;
-    uint64          starttime;
+    double          starttime;
     uint64          tlimit;	/* Simulation time limit */
     uint64          pwdtime;	/* Cycles in power-down mode */
     uint64          nstore;	/* Number of load instructions */
@@ -198,6 +198,7 @@ extern void	reset_all (void);
 extern void	sys_reset (void);
 extern void	sys_halt (void);
 extern int	bfd_load (char *fname);
+extern double	get_time (void);
 
 /* exec.c */
 extern int	dispatch_instruction (struct pstate *sregs);
-- 
2.1.0