[PATCH] Fix bootstrap on m68k (PR target/69885)

[Jakub Jelinek]

On Mon, Feb 22, 2016 at 09:15:29AM -0700, Jeff Law wrote:
> Yea, as it's currently written, it's a bit vague.  I think your suggesting
> of saying that VOIDmode should not be used is what we need. I'll leave the
> final word-smithing to you.

Here is what I've committed.

2016-02-22  Jakub Jelinek  <jakub@redhat.com>

	PR target/69885
	* doc/md.texi (ashl@var{m}3): Document that mode of operand 2 must
	be specified.

--- gcc/doc/md.texi.jj	2016-02-12 00:50:55.000000000 +0100
+++ gcc/doc/md.texi	2016-02-22 17:20:00.910016901 +0100
@@ -5283,7 +5283,9 @@ Arithmetic-shift operand 1 left by a num
 2, and store the result in operand 0.  Here @var{m} is the mode of
 operand 0 and operand 1; operand 2's mode is specified by the
 instruction pattern, and the compiler will convert the operand to that
-mode before generating the instruction.  The meaning of out-of-range shift
+mode before generating the instruction.  The shift or rotate expander
+or instruction pattern should explicitly specify the mode of the operand 2,
+it should never be @code{VOIDmode}.  The meaning of out-of-range shift
 counts can optionally be specified by @code{TARGET_SHIFT_TRUNCATION_MASK}.
 @xref{TARGET_SHIFT_TRUNCATION_MASK}.  Operand 2 is always a scalar type.
 
	Jakub