Allow ADDR_EXPRs of TARGET_MEM_REFs

This patch allows ADDR_EXPR <TARGET_MEM_REF ...>, which is useful
when calling internal functions that take pointers to memory that
is conditionally loaded or stored.  This is a prerequisite to the
following ivopts patch.

2018-01-13  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* expr.c (expand_expr_addr_expr_1): Handle ADDR_EXPRs of
	TARGET_MEM_REFs.
	* gimple-expr.h (is_gimple_addressable: Likewise.
	* gimple-expr.c (is_gimple_address): Likewise.
	* internal-fn.c (expand_call_mem_ref): New function.
	(expand_mask_load_optab_fn): Use it.
	(expand_mask_store_optab_fn): Likewise.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r256627

1 files changed, 3 insertions, 0 deletions

diff --git a/gcc/expr.c b/gcc/expr.c
index cd1e57d..42f889f 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -7885,6 +7885,9 @@ expand_expr_addr_expr_1 (tree exp, rtx target, scalar_int_mode tmode,
 	return expand_expr (tem, target, tmode, modifier);
       }
 
+    case TARGET_MEM_REF:
+      return addr_for_mem_ref (exp, as, true);
+
     case CONST_DECL:
       /* Expand the initializer like constants above.  */
       result = XEXP (expand_expr_constant (DECL_INITIAL (exp),