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rtems: rtems_scheduler_get_processor_maximum()

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In uniprocessor configurations, use compile-time constants for
rtems_scheduler_get_processor_maximum() and
rtems_scheduler_get_processor().  This helps compilers and static
analyzers to deduce that some loop bodies are only executed once and
some conditional statements have a fixed outcome (may improve code
generation and reduce false positives).

In SMP configurations, directly provide the internal implementation for
performance reasons.
This commit is contained in:
Sebastian Huber
2020-03-03 13:45:50 +01:00
parent fdeaa64e17
commit 8b73ee5023
4 changed files with 3 additions and 54 deletions
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2
cpukit/Makefile.am
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@@ -700,8 +700,6 @@ librtemscpu_a_SOURCES += rtems/src/eventseize.c
librtemscpu_a_SOURCES += rtems/src/eventsend.c
librtemscpu_a_SOURCES += rtems/src/eventsurrender.c
librtemscpu_a_SOURCES += rtems/src/getapiconfig.c
librtemscpu_a_SOURCES += rtems/src/getcurrentprocessor.c
librtemscpu_a_SOURCES += rtems/src/getprocessorcount.c
librtemscpu_a_SOURCES += rtems/src/intrbody.c
librtemscpu_a_SOURCES += rtems/src/intrcatch.c
librtemscpu_a_SOURCES += rtems/src/modes.c

5
cpukit/include/rtems/rtems/tasks.h
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@@ -21,6 +21,7 @@
#include <rtems/rtems/attr.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/types.h>
#include <rtems/score/smp.h>
#ifdef __cplusplus
extern "C" {
@@ -600,7 +601,7 @@ rtems_status_code rtems_scheduler_ident_by_processor_set(
*
* @return The index of the current processor.
*/
uint32_t rtems_scheduler_get_processor( void );
#define rtems_scheduler_get_processor() _SMP_Get_current_processor()
/**
* @brief Returns the index of the current processor.
@@ -633,7 +634,7 @@ rtems_get_current_processor( void )
*
* @see rtems_scheduler_add_processor() and rtems_scheduler_remove_processor().
*/
RTEMS_CONST uint32_t rtems_scheduler_get_processor_maximum( void );
#define rtems_scheduler_get_processor_maximum() _SMP_Get_processor_maximum()
/**
* @brief Returns the processor maximum supported by the system.

25
cpukit/rtems/src/getcurrentprocessor.c
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@@ -1,25 +0,0 @@
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/tasks.h>
#include <rtems/score/smp.h>
uint32_t rtems_scheduler_get_processor(void)
{
return _SMP_Get_current_processor();
}

25
cpukit/rtems/src/getprocessorcount.c
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@@ -1,25 +0,0 @@
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/tasks.h>
#include <rtems/score/smp.h>
uint32_t rtems_scheduler_get_processor_maximum(void)
{
return _SMP_Get_processor_maximum();
}