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    • 13. 发明授权
    • Method and apparatus for alleviating register window size constraints
    • 缓解寄存器窗口大小约束的方法和装置
    • US07013377B2
    • 2006-03-14
    • US10654256
    • 2003-09-03
    • Lawrence A. SpracklenStevan VlaovicSteven R. Hart
    • Lawrence A. SpracklenStevan VlaovicSteven R. Hart
    • G06F12/02
    • G06F9/30127G06F9/30043G06F9/30076G06F9/30101
    • A method and apparatus provides the capability for a single function to safely use multiple register windows within the same function, with minimal additional support from the operating system, by specifying a new window pointer, the “Effective Current Window Pointer” (ECWP), to be used in conjunction with the prior art window pointer. According to the present invention, the new window pointer ECWP can be used to override the prior art window pointer in dictating from which register window the operands stipulated by the instructions to be executed are sourced/sinked. Consequently, using the method and apparatus of the invention, the number of spills to memory is reduced, the number of instructions required is decreased, resources are used more efficiently, and costly dependency problems and RAW (read-after-write) stalls are prevented.
    • 一种方法和装置通过指定一个新的窗口指针“有效当前窗口指针”(ECWP),为单个功能提供了在相同功能中安全地使用多个寄存器窗口的能力,同时通过操作系统的最小额外的支持, 与现有技术的窗口指针结合使用。 根据本发明,可以使用新的窗口指针ECWP来覆盖现有技术的窗口指针,从而从哪个寄存器窗口指定要执行的指令规定的操作数来源/汇入。 因此,使用本发明的方法和装置,减少了对存储器的溢出次数,减少了所需指令的数量,更有效地使用资源,并且防止了昂贵的依赖问题和RAW(写后读取)停止 。