Question about gen_rtx_VAR_LOCATION

[Jie Zhang]

There are two calls of gen_rtx_VAR_LOCATION in cfgexpand.c. Both calls 
cast a tree to rtx as the third argument. Why a tree is used in RTL 
expression? Will it be transformed into RTL later or all RTL passes 
should recognize it's a tree and just ignore it? Thanks.

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Jie Zhang
CodeSourcery
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