Be stricter about CONST_VECTOR operands

The recent gen_vec_duplicate patches used CONST_VECTOR for all
constants, but the documentation says:

  @findex const_vector
  @item (const_vector:@var{m} [@var{x0} @var{x1} @dots{}])
  Represents a vector constant.  The square brackets stand for the vector
  containing the constant elements.  @var{x0}, @var{x1} and so on are
  the @code{const_int}, @code{const_double} or @code{const_fixed} elements.

Both the AArch32 and AArch64 ports relied on the elements having
this form and would ICE if the element was something like a CONST
instead.  This showed up as a failure in vect-126.c for both arm-eabi
and aarch64-elf (but not aarch64-linux-gnu, which is what the series
was tested on).

The two obvious options were to redefine CONST_VECTOR to accept all
constants or make gen_vec_duplicate honour the existing documentation.
It looks like other code also assumes that integer CONST_VECTORs contain
CONST_INTs, so the patch does the latter.

I deliberately didn't add an assert to gen_const_vec_duplicate
because it looks like the SPU port *does* expect to be able to create
CONST_VECTORs of symbolic constants.

Also, I think the list above should include const_wide_int for vectors
of TImode and wider.

The new routine takes a mode for consistency with the generators,
and because I think it does make sense to accept all constants for
variable-length:

    (const (vec_duplicate ...))

rather than have some rtxes for which we instead use:

    (vec_duplicate (const ...))


2017-11-09  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* doc/rtl.texi (const_vector): Say that elements can be
	const_wide_ints too.
	* emit-rtl.h (valid_for_const_vec_duplicate_p): Declare.
	* emit-rtl.c (valid_for_const_vec_duplicate_p): New function.
	(gen_vec_duplicate): Use it instead of CONSTANT_P.
	* optabs.c (expand_vector_broadcast): Likewise.

From-SVN: r254586

1 files changed, 12 insertions, 1 deletions

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index ac6fd6a..a076711 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -5772,6 +5772,17 @@ init_emit (void)
 #endif
 }
 
+/* Return true if X is a valid element for a duplicated vector constant
+   of the given mode.  */
+
+bool
+valid_for_const_vec_duplicate_p (machine_mode, rtx x)
+{
+  return (CONST_SCALAR_INT_P (x)
+	  || CONST_DOUBLE_AS_FLOAT_P (x)
+	  || CONST_FIXED_P (x));
+}
+
 /* Like gen_const_vec_duplicate, but ignore const_tiny_rtx.  */
 
 static rtx
@@ -5807,7 +5818,7 @@ gen_const_vec_duplicate (machine_mode mode, rtx elt)
 rtx
 gen_vec_duplicate (machine_mode mode, rtx x)
 {
-  if (CONSTANT_P (x))
+  if (valid_for_const_vec_duplicate_p (mode, x))
     return gen_const_vec_duplicate (mode, x);
   return gen_rtx_VEC_DUPLICATE (mode, x);
 }