RFA: Document first operand to RTX_AUTOINC

Richard Sandiford rdsandiford@googlemail.com
Tue Sep 2 18:00:00 GMT 2014

As Jeff suggested here:
this patch documents that the first operand to an RTX_AUTOINC
is the automodified register.

Tested on x86_64-linux-gnu.  OK to install?


	* doc/rtl.texi (RTX_AUTOINC): Document that the first operand is
	the automodified register.

Index: gcc/doc/rtl.texi
--- gcc/doc/rtl.texi	2014-05-06 18:38:47.982200623 +0100
+++ gcc/doc/rtl.texi	2014-08-30 16:04:50.870456416 +0100
@@ -193,7 +193,8 @@ An RTX code for something that matches i
 An RTX code for an auto-increment addressing mode, such as
+@code{POST_INC}.  @samp{XEXP (@var{x}, 0)} gives the auto-modified
 @item RTX_EXTRA
 All other RTX codes.  This category includes the remaining codes used

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