[Webkit-unassigned] [Bug 183243] New: [MIPS] Optimize generated JIT code for loads/stores from/to an absolute address

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183243

            Bug ID: 183243
           Summary: [MIPS] Optimize generated JIT code for loads/stores
                    from/to an absolute address
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: stanislav.ocovaj at rt-rk.com

JIT currently generates three MIPS instructions for a load/store from/to an absolute address:
  lui adrTmpReg, address >> 16
  ori adrTmpReg, address & 0xffff
  lw dataReg, 0(adrTmpReg)
Since load/store instructions on MIPS have a 16-bit offset, lower 16 bits of the address can be encoded into the load/store and ori can be removed:
  lui adrTmpReg, (address + 0x8000) >> 16
  lw dataReg, (address & 0xffff)(adrTmpReg)

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