[hellogcc] TARGET_PREFERRED_RENAME_CLASS 部分的翻译
- From: Yao Qi <qiyaoltc@xxxxxxxxx>
- To: hellogcc@xxxxxxxxxxxxx
- Date: Fri, 18 Feb 2011 10:45:38 +0800
我把tm.texi里边的一段翻译了，大家看看。
+@en A target hook that places additional preference on the register
class to use when it is necessary to rename a register in class
@var{rclass} to another class, or perhaps @var{NO_REGS}, if no
preferred register class is found or hook
@code{preferred_rename_class} is not implemented. Sometimes returning
a more restrictive class makes better code. For example, on ARM,
thumb-2 instructions using @code{LO_REGS} may be smaller than
instructions using @code{GENERIC_REGS}. By returning @code{LO_REGS}
from @code{preferred_rename_class}, code size can be reduced.
+
+一个目标钩子，当把一个寄存器类别@var{rclass}重命名为另外一个寄存器类别的时候，对选择的寄存器类别施加额外的偏好，或者，如果没有偏好的寄存器类别被发现或者@code{preferred_rename_class}钩子没有实现，也被重命名为@var{NO_REGS}。有些时候，这个钩子返回一个更加严格的寄存器类别，可能产生更好的代码。例如，在ARM平台，使用寄存器类别@code{LO_REGS}的thumb-2指令可能比使用寄存器类别@code{GENERIC_REGS}的指令更小。通过从@code{preferred_rename_class}返回寄存器类别@code{LO_REGS}，代码体积肯能会减小。
--
Yao Qi <qiyaoltc AT gmail DOT com>
http://sites.google.com/site/duewayqi/
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