[Webkit-unassigned] [Bug 232869] New: Compiler Incorrect Optimization

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Nov 9 01:55:17 PST 2021


https://bugs.webkit.org/show_bug.cgi?id=232869

            Bug ID: 232869
           Summary: Compiler Incorrect Optimization
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vulbugs at gmail.com

OS: ubuntu20.04
Architecture: <x64>

./jsc bug.js

expected output
3
3

actual output
3
-1


bug.js
##################################
function f() {
    let v0 = 2147483648;
    const v1 = v0--;
    const v2 = new Float32Array([111,222,333,v1]);
    const v3 = v2.indexOf(v0);
    return v3;
}
let a0 = f();
print(a0);

for (let i = 0; i < 0x1000; i++) { f(); }
let a3 = f();
print(a3);

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