nrf/gccollect: Use the SP register instead of MSP.
Using the current stack pointer directly saves 8 bytes of code.
We need the *current* register anyway for GC (which is always MSP).
#include "py/gc.h"
#include "gccollect.h"
-static inline uint32_t get_msp(void)
-{
- register uint32_t result;
- __asm volatile ("MRS %0, msp\n" : "=r" (result) );
- return(result);
+static inline uintptr_t get_sp(void) {
+ uintptr_t result;
+ __asm__ ("mov %0, sp\n" : "=r" (result) );
+ return result;
}
void gc_collect(void) {
// start the GC
gc_collect_start();
- mp_uint_t sp = get_msp(); // Get stack pointer
+ // Get stack pointer
+ uintptr_t sp = get_sp();
// trace the stack, including the registers (since they live on the stack in this function)
gc_collect_root((void**)sp, ((uint32_t)&_ram_end - sp) / sizeof(uint32_t));
