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diff --git a/gas/doc/c-ia64.texi b/gas/doc/c-ia64.texi
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+++ b/gas/doc/c-ia64.texi
@@ -65,6 +65,11 @@ These options select the byte order. The @code{-mle} option selects little-endi
byte order (default) and @code{-mbe} selects big-endian byte order. Note that
IA-64 machine code always uses little-endian byte order.
+@item -mtune=itanium1
+@item -mtune=itanium2
+Tune for a particular IA-64 CPU, @var{itanium1} or @var{itanium2}. The
+default is @var{itanium2}.
+
@item -munwind-check=warning
@item -munwind-check=error
These options control what the assembler will do when performing