[Webkit-unassigned] [Bug 149254] New: Calling a float function on x86 in WebAssembly incorrectly returns a double

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149254

            Bug ID: 149254
           Summary: Calling a float function on x86 in WebAssembly
                    incorrectly returns a double
    Classification: Unclassified
           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: sukolsak at gmail.com

In WebAssembly on x86 (32-bit), when we call a function that returns a float or a double, we use the FSTP instruction to read the return value from the FPU register stack. The FSTP instruction converts the value to single-precision or double-precision floating-point format, depending on the destination operand. Currently, we always use double as the destination. This is wrong. We should use the correct type.

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