[Webkit-unassigned] [Bug 19803] New: Merge multiple loads into a single instruction

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Jun 28 16:21:37 PDT 2008


https://bugs.webkit.org/show_bug.cgi?id=19803

           Summary: Merge multiple loads into a single instruction
           Product: WebKit
           Version: 526+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: cwzwarich at uwaterloo.ca
                CC: mjs at apple.com


Since (load, load) is one of the most common instruction pairs on SunSpider and
load has one of the smallest instruction bodies, this sounds like a good idea.
However, all of my attempts to implement it lead to massive regressions on
SunSpider, even if I don't even use the opcode. This points to a random GCC
problem, so I'll post the code to see if we can fix it together.


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