Allow variable-sized temporary variables in gimplify.c

[Richard Sandiford]

This is needed to build libgfortran for SVE.  The OpenMP code needs
to create temporary vector variables, and the variables will therefore
be variable-sized for SVE.  Earlier patches made such variables work.

Tested on aarch64-linux-gnu, x86_64-linux-gnu and powerpc64le-linux-gnu.
Also tested by comparing the before-and-after assembly output for at
least one target per CPU directory.  OK to install?

Thanks,
Richard


2018-01-12  Richard Sandiford  <richard.sandif...@linaro.org>

gcc/
        * gimplify.c (gimple_add_tmp_var_fn): Allow variables to have a
        poly_uint64 size, rather than requiring an unsigned HOST_WIDE_INT size.
        (gimple_add_tmp_var): Likewise.

Index: gcc/gimplify.c
===================================================================
--- gcc/gimplify.c      2018-01-10 08:43:40.053367209 +0000
+++ gcc/gimplify.c      2018-01-12 12:49:36.756892670 +0000
@@ -702,7 +702,7 @@ gimple_add_tmp_var_fn (struct function *
   /* Later processing assumes that the object size is constant, which might
      not be true at this point.  Force the use of a constant upper bound in
      this case.  */
-  if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (tmp)))
+  if (!tree_fits_poly_uint64_p (DECL_SIZE_UNIT (tmp)))
     force_constant_size (tmp);
 
   DECL_CONTEXT (tmp) = fn->decl;
@@ -721,7 +721,7 @@ gimple_add_tmp_var (tree tmp)
   /* Later processing assumes that the object size is constant, which might
      not be true at this point.  Force the use of a constant upper bound in
      this case.  */
-  if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (tmp)))
+  if (!tree_fits_poly_uint64_p (DECL_SIZE_UNIT (tmp)))
     force_constant_size (tmp);
 
   DECL_CONTEXT (tmp) = current_function_decl;