diff options
Diffstat (limited to 'c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h')
| -rw-r--r-- | c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h b/c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h index 371626cd4b..6b30c0ed0b 100644 --- a/c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h +++ b/c/src/exec/score/cpu/powerpc/rtems/new-exceptions/cpu.h @@ -228,12 +228,19 @@ extern "C" { * until a context switch is made to another, different FP task. * Thus in a system with only one FP task, the FP context will never * be saved or restored. + * + * Note, however that compilers may use floating point registers/ + * instructions for optimization or they may save/restore FP registers + * on the stack. You must not use deferred switching in these cases + * and on the PowerPC attempting to do so will raise a "FP unavailable" + * exception. */ /* * ACB Note: This could make debugging tricky.. */ -#define CPU_USE_DEFERRED_FP_SWITCH TRUE +/* conservative setting (FALSE); probably doesn't affect performance too much */ +#define CPU_USE_DEFERRED_FP_SWITCH FALSE /* * Does this port provide a CPU dependent IDLE task implementation? |