[Webkit-unassigned] [Bug 198106] New: pow functions returns 0 when exponent 1.0 or -1.0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198106

            Bug ID: 198106
           Summary: pow functions returns 0 when exponent 1.0 or -1.0
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philipp.gloor at gmail.com

This issue occured when we updated from Emscripten 1.38.6 to 1.38.30 (might appear before) but it only showed up on iOS 12.2/12.3/12.4 Beta. That's why I'm posting this here.

This code has unexpected behaviour when the exponent is 1.0 or -1.0, i.e. the function returns 0.

The code in C++ is:

// wasm_bug.cpp
#include <emscripten/bind.h>
#include <cstdio>

void pow_test(double exp) {
   printf("pow(10, %f): %f\n", exp, pow(10.0, exp));
}

EMSCRIPTEN_BINDINGS() {
  emscripten::function("pow_test", &pow_test);
}


compiled with: emcc --bind -O2 wasm_bug.cpp -o out.js

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