* doc/rtl.texi: Document value extension requirements for CONST_INT.

From-SVN: r94004

* doc/rtl.texi: Document value extension requirements for CONST_INT.
From-SVN: r94004
eacf8912 · Paul Brook · Paul Brook · 7e4d34fd · eacf8912 · eacf8912
Commit eacf8912 authored Jan 21, 2005 by Paul Brook Committed by Paul Brook Jan 21, 2005
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gcc/ChangeLog
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gcc/doc/rtl.texi
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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2005-01-20  Paul Brook  <paul@codesourcery.com>
+
+	* doc/rtl.texi: Document value extension requirements for CONST_INT.
+
 2005-01-20  Kazu Hirata  <kazu@cs.umass.edu>

 	* tree-cfg.c (tree_verify_flow_info): Check that a nonlocal

--- a/gcc/doc/rtl.texi
+++ b/gcc/doc/rtl.texi
@@ -1286,6 +1286,9 @@ This type of expression represents the integer value @var{i}.  @var{i}
 is customarily accessed with the macro @code{INTVAL} as in
 @code{INTVAL (@var{exp})}, which is equivalent to @code{XWINT (@var{exp}, 0)}.

+Constants generated for modes with fewer bits than @code{HOST_WIDE_INT}
+must be sign extended to full width (e.g., with @code{gen_int_mode}).
+
 @findex const0_rtx
 @findex const1_rtx
 @findex const2_rtx