go: cmd/compile: floating-point broken on android-arm-corellium builder

--- FAIL: TestFloat32 (0.11s)
    rand_test.go:360: Float32() should be in range [0,1). ct: 2274285 f: 0.27337575
FAIL
FAIL	math/rand	0.548s

Seems to have started after Jan. 19.

Have there been recent changes in this builder image or configuration? Otherwise, the only major changes over that interval have been @4a6f656c’s RISC-V changes.

CC @cagedmantis @dmitshur @toothrot @zenly

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 15 (15 by maintainers)

Most upvoted comments

I can reproduce with C.

#include <stdio.h>

int geq(double x, double y) {
  return x >= y;
}

double x = 3;
double y = 4;

int main(int argc, char *argv[]) {
  for (int i = 0; i < 100000000; i++) {
    if (geq(x, y)) {
          printf("failed at iteration %d\n", i);
        }
    }
}

failed at iteration 532580
failed at iteration 19932913
failed at iteration 29020612
failed at iteration 32054460
failed at iteration 67123803
failed at iteration 70001529
failed at iteration 87241841
failed at iteration 89238362
failed at iteration 94347886

Note that it fails when compiled with arm-linux-gnueabihf-gcc (hard float) and not with arm-linux-gnueabi-gcc (soft float).

Anyone know how to contact Corellium and file a bug? Their website is not very helpful.

randall77 on Jan 28, 2020