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Optimization in CM4 FPU support. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3607 35acf78f-673a-0410-8e92-d51de3d6d3f4
master
gdisirio 2011-12-12 19:44:39 +00:00
parent c81fbcefa2
commit 27ab6ff1f1
3 changed files with 30 additions and 34 deletions
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26
docs/reports/STM32F407-168-GCC-FPU.txt
View File

@ -6,7 +6,7 @@ Settings: SYSCLK=168, ACR=0x705 (5 wait states)
*** ChibiOS/RT test suite
***
*** Kernel: 2.3.5unstable
*** Compiled: Dec 11 2011 - 17:14:07
*** Compiled: Dec 12 2011 - 20:40:15
*** Compiler: GCC 4.6.2
*** Architecture: ARMv7-ME
*** Core Variant: Cortex-M4F
@ -100,51 +100,51 @@ Settings: SYSCLK=168, ACR=0x705 (5 wait states)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.1 (Benchmark, messages #1)
--- Score : 559399 msgs/S, 1118798 ctxswc/S
--- Score : 559422 msgs/S, 1118844 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.2 (Benchmark, messages #2)
--- Score : 476758 msgs/S, 953516 ctxswc/S
--- Score : 476781 msgs/S, 953562 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.3 (Benchmark, messages #3)
--- Score : 476757 msgs/S, 953514 ctxswc/S
--- Score : 476781 msgs/S, 953562 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.4 (Benchmark, context switch)
--- Score : 1639312 ctxswc/S
--- Score : 1639392 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.5 (Benchmark, threads, full cycle)
--- Score : 371289 threads/S
--- Score : 371307 threads/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.6 (Benchmark, threads, create only)
--- Score : 496514 threads/S
--- Score : 496538 threads/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.7 (Benchmark, mass reschedule, 5 threads)
--- Score : 151014 reschedules/S, 906084 ctxswc/S
--- Score : 151022 reschedules/S, 906132 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.8 (Benchmark, round robin context switching)
--- Score : 1018620 ctxswc/S
--- Score : 1018660 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.9 (Benchmark, I/O Queues throughput)
--- Score : 1766592 bytes/S
--- Score : 1766676 bytes/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.10 (Benchmark, virtual timers set/reset)
--- Score : 1997950 timers/S
--- Score : 1998046 timers/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.11 (Benchmark, semaphores wait/signal)
--- Score : 2601996 wait+signal/S
--- Score : 2602084 wait+signal/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.12 (Benchmark, mutexes lock/unlock)
--- Score : 1766592 lock+unlock/S
--- Score : 1766664 lock+unlock/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.13 (Benchmark, RAM footprint)

36
os/ports/GCC/ARMCMx/chcore_v7m.c
View File

@ -98,21 +98,20 @@ CH_IRQ_HANDLER(SysTickVector) {
* @note The PendSV vector is only used in advanced kernel mode.
*/
void SVCallVector(void) {
uint32_t *psp;
struct extctx *ctxp;
/* Current PSP value.*/
asm volatile ("mrs %0, PSP" : "=r" (psp) : : "memory");
asm volatile ("mrs %0, PSP" : "=r" (ctxp) : : "memory");
/* Discarding the current exception context and positioning the stack to
point to the real one.*/
psp = (uint32_t *)((struct extctx *)psp + 1);
ctxp++;
#if CORTEX_USE_FPU
/* Restoring the special registers SCB_FPCCR and FPCAR.*/
SCB_FPCAR = *psp++;
SCB_FPCCR = *psp++;
/* Restoring the special register SCB_FPCCR.*/
SCB_FPCCR = (uint32_t)ctxp->fpccr;
#endif
asm volatile ("msr PSP, %0" : : "r" (psp) : "memory");
asm volatile ("msr PSP, %0" : : "r" (ctxp) : "memory");
port_unlock_from_isr();
}
#endif /* !CORTEX_SIMPLIFIED_PRIORITY */
@ -125,21 +124,20 @@ void SVCallVector(void) {
* @note The PendSV vector is only used in compact kernel mode.
*/
void PendSVVector(void) {
uint32_t *psp;
struct extctx *ctxp;
/* Current PSP value.*/
asm volatile ("mrs %0, PSP" : "=r" (psp) : : "memory");
asm volatile ("mrs %0, PSP" : "=r" (ctxp) : : "memory");
/* Discarding the current exception context and positioning the stack to
point to the real one.*/
psp = (uint32_t *)((struct extctx *)psp + 1);
ctxp++;
#if CORTEX_USE_FPU
/* Restoring the special registers SCB_FPCCR and FPCAR.*/
SCB_FPCAR = *psp++;
SCB_FPCCR = *psp++;
/* Restoring the special register SCB_FPCCR.*/
SCB_FPCCR = (uint32_t)ctxp->fpccr;
#endif
asm volatile ("msr PSP, %0" : : "r" (psp) : "memory");
asm volatile ("msr PSP, %0" : : "r" (ctxp) : "memory");
}
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
@ -186,19 +184,17 @@ void _port_irq_epilogue(void) {
port_lock_from_isr();
if ((SCB_ICSR & ICSR_RETTOBASE)) {
uint32_t *psp;
struct extctx *ctxp;
/* Current PSP value.*/
asm volatile ("mrs %0, PSP" : "=r" (psp) : : "memory");
asm volatile ("mrs %0, PSP" : "=r" (ctxp) : : "memory");
#if CORTEX_USE_FPU
{
uint32_t fpccr;
/* Saving the special registers SCB_FPCCR and FPCAR as extra context.*/
*--psp = fpccr = SCB_FPCCR;
*--psp = SCB_FPCAR;
/* Saving the special register SCB_FPCCR.*/
ctxp->fpccr = (regarm_t)(fpccr = SCB_FPCCR);
/* Now the FPCCR is modified in order to not restore the FPU status
from the artificial return context.*/
@ -208,7 +204,7 @@ void _port_irq_epilogue(void) {
/* Adding an artificial exception return context, there is no need to
populate it fully.*/
ctxp = ((struct extctx *)psp) - 1;
ctxp--;
asm volatile ("msr PSP, %0" : : "r" (ctxp) : "memory");
ctxp->pc = _port_switch_from_isr;
ctxp->xpsr = (regarm_t)0x01000000;

2
os/ports/GCC/ARMCMx/chcore_v7m.h
View File

@ -184,7 +184,7 @@ struct extctx {
regarm_t s14;
regarm_t s15;
regarm_t fpscr;
regarm_t reserved;
regarm_t fpccr;
#endif /* CORTEX_USE_FPU */
};