File: thumb_vfp_sqrt.c

package info (click to toggle)
micropython 1.25.0%2Bds-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 48,944 kB
  • sloc: ansic: 317,850; python: 59,539; xml: 4,241; makefile: 3,530; sh: 1,421; javascript: 744; asm: 681; cpp: 45; exp: 11; pascal: 6
file content (10 lines) | stat: -rw-r--r-- 256 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
 
// an implementation of sqrt for Thumb using hardware double-precision VFP instructions

double sqrt(double x) {
    double ret;
    __asm__ volatile (
            "vsqrt.f64  %P0, %P1\n"
            : "=w" (ret)
            : "w"  (x));
    return ret;
}