[Webkit-unassigned] [Bug 171057] New: [JSC] Use JSFixedArray directly when using call_varargs
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Apr 20 08:42:27 PDT 2017
https://bugs.webkit.org/show_bug.cgi?id=171057
Bug ID: 171057
Summary: [JSC] Use JSFixedArray directly when using
call_varargs
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: utatane.tea at gmail.com
Currently, when executing the following code,
var array = [0, 1, 2];
Math.max(...array);
The bytecode becomes like this.
[ 49] spread loc9, loc10
[ 52] new_array_with_spread loc7, loc9, 1, BitVector:0:1
[ 57] mov loc9, loc8
[ 60] call_varargs loc5, loc5, loc8, loc7, -11, 0 predicting None
But (52)'s array is unnecessary if argument is only consisted by one spread.
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