aarch64: Fix SVE ACLE handling of SImode pointers

This long-overdue patch promotes SImode pointers to DImode addresses,
avoiding various ICEs in the existing tests.

2020-01-21  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64-sve-builtins.h
	(function_expander::convert_to_pmode): Declare.
	* config/aarch64/aarch64-sve-builtins.cc
	(function_expander::convert_to_pmode): New function.
	(function_expander::get_contiguous_base): Use it.
	(function_expander::prepare_gather_address_operands): Likewise.
	* config/aarch64/aarch64-sve-builtins-sve2.cc
	(svwhilerw_svwhilewr_impl::expand): Likewise.

gcc/ChangeLog

+2020-01-21  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* config/aarch64/aarch64-sve-builtins.h
+	(function_expander::convert_to_pmode): Declare.
+	* config/aarch64/aarch64-sve-builtins.cc
+	(function_expander::convert_to_pmode): New function.
+	(function_expander::get_contiguous_base): Use it.
+	(function_expander::prepare_gather_address_operands): Likewise.
+	* config/aarch64/aarch64-sve-builtins-sve2.cc
+	(svwhilerw_svwhilewr_impl::expand): Likewise.
+
 2020-01-21  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	PR target/92424

gcc/config/aarch64/aarch64-sve-builtins-sve2.cc

@@ -442,6 +442,8 @@ public:
   rtx
   expand (function_expander &e) const OVERRIDE
   {
+    for (unsigned int i = 0; i < 2; ++i)
+      e.args[i] = e.convert_to_pmode (e.args[i]);
     return e.use_exact_insn (code_for_while (m_unspec, Pmode, e.gp_mode (0)));
   }
 

gcc/config/aarch64/aarch64-sve-builtins.cc

@@ -2602,12 +2602,21 @@ function_expander::overlaps_input_p (rtx x)
   return false;
 }
 
+/* Convert ptr_mode value X to Pmode.  */
+rtx
+function_expander::convert_to_pmode (rtx x)
+{
+  if (ptr_mode == SImode)
+    x = simplify_gen_unary (ZERO_EXTEND, DImode, x, SImode);
+  return x;
+}
+
 /* Return the base address for a contiguous load or store function.
    MEM_MODE is the mode of the addressed memory.  */
 rtx
 function_expander::get_contiguous_base (machine_mode mem_mode)
 {
-  rtx base = args[1];
+  rtx base = convert_to_pmode (args[1]);
   if (mode_suffix_id == MODE_vnum)
     {
       /* Use the size of the memory mode for extending loads and truncating
@@ -2814,9 +2823,7 @@ function_expander::prepare_gather_address_operands (unsigned int argno,
     {
       /* Scalar base, vector displacement.  This is the order that the md
 	 pattern wants.  */
-      if (Pmode == SImode)
-	args[argno] = simplify_gen_unary (ZERO_EXTEND, DImode,
-					  args[argno], SImode);
+      args[argno] = convert_to_pmode (args[argno]);
       vector_type = displacement_vector_type ();
       if (units == UNITS_elements && !scaled_p)
 	shift_idx = argno + 1;

gcc/config/aarch64/aarch64-sve-builtins.h

@@ -526,6 +526,7 @@ public:
 
   bool overlaps_input_p (rtx);
 
+  rtx convert_to_pmode (rtx);
   rtx get_contiguous_base (machine_mode);
   rtx get_fallback_value (machine_mode, unsigned int,
 			  unsigned int, unsigned int &);