epics/pcas
0
0
Fork 0
Code Issues Pull Requests Projects Wiki Activity

Revive the canary, and add a test routine that checks whether the optimizer

Browse Source 
bug is still present.  Tornado 2.x compilers for 68K need -O0 to work.
This commit is contained in:
Andrew Johnson
2004-11-17 19:58:09 +00:00
parent e658f3c108
commit 146eb58120
1 changed files with 14 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/libCom/osi/os/vxWorks/osdThread.c
View File

@@ -358,10 +358,21 @@ void *epicsThreadPrivateGet(epicsThreadPrivateId id)
return(data);
}
/* Tornado compilers for 68k have an optimizer bug at -O1 and above; the
* code generated for epicsThreadSleepQuantum() is incorrect. This routine
* tests for that bug. This routine must appear above the code it calls or
* or the optimizer may inline epicsThreadSleepQuantum() */
int vxWorksBrokenCompilerTest()
{
double q = epicsThreadSleepQuantum();
double one = q * sysClkRateGet();
int ok = (one > 0.999) && (one < 1.001);
printf("%s: epicsThreadSleepQuantum() = %f\n", ok ? "Ok" : "BROKEN", q);
return ok;
}
double epicsThreadSleepQuantum ()
{
/* If HZ is a double, under -O3 optimization the Tornado 2.x
* compilers generate bad code. Using a float works. */
float HZ = sysClkRateGet();
double HZ = sysClkRateGet ();
return 1.0 / HZ;
}