PR target/83009: Relax strict address checking for store pair lanes

The operand constraint for the memory address of store/load pair lanes was
enforcing strictly hardware registers be allowed as memory addresses.  We want
to relax that such that these patterns can be used by combine.  During register
allocation the register constraint will enforce the correct register is chosen.

gcc
2018-05-24  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	PR target/83009
	* config/aarch64/predicates.md (aarch64_mem_pair_lanes_operand): Make
	address check not strict.

gcc/testsuite
2018-05-24  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	PR target/83009
	* gcc/target/aarch64/store_v2vec_lanes.c: Add extra tests.

From-SVN: r260635

gcc/ChangeLog

+2018-05-24  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
+	PR target/83009
+	* config/aarch64/predicates.md (aarch64_mem_pair_lanes_operand): Make
+	address check not strict.
+
 2018-05-24  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	* gimple-match.h (gimple_match_op): New class.

gcc/config/aarch64/predicates.md

@@ -226,7 +226,7 @@
 ;; as a 128-bit vec_concat.
 (define_predicate "aarch64_mem_pair_lanes_operand"
   (and (match_code "mem")
-       (match_test "aarch64_legitimate_address_p (DFmode, XEXP (op, 0), 1,
+       (match_test "aarch64_legitimate_address_p (DFmode, XEXP (op, 0), false,
 						  ADDR_QUERY_LDP_STP)")))
 
 (define_predicate "aarch64_prefetch_operand"

gcc/testsuite/ChangeLog

+2018-05-24  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
+	PR target/83009
+	* gcc/target/aarch64/store_v2vec_lanes.c: Add extra tests.
+
 2018-05-23  Jozef Lawrynowicz  <jozef.l@somniumtech.com>
 
 	PR target/78849

gcc/testsuite/gcc.target/aarch64/store_v2vec_lanes.c

@@ -22,10 +22,32 @@ construct_lane_2 (long long *y, v2di *z)
   z[2] = x;
 }
 
+void
+construct_lane_3 (double **py, v2df **pz)
+{
+  double *y = *py;
+  v2df *z = *pz;
+  double y0 = y[0] + 1;
+  double y1 = y[1] + 2;
+  v2df x = {y0, y1};
+  z[2] = x;
+}
+
+void
+construct_lane_4 (long long **py, v2di **pz)
+{
+  long long *y = *py;
+  v2di *z = *pz;
+  long long y0 = y[0] + 1;
+  long long y1 = y[1] + 2;
+  v2di x = {y0, y1};
+  z[2] = x;
+}
+
 /* We can use the load_pair_lanes<mode> pattern to vec_concat two DI/DF
    values from consecutive memory into a 2-element vector by using
    a Q-reg LDR.  */
 
-/* { dg-final { scan-assembler-times "stp\td\[0-9\]+, d\[0-9\]+" 1 { xfail ilp32 } } } */
-/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]+" 1 { xfail ilp32 } } } */
-/* { dg-final { scan-assembler-not "ins\t" { xfail ilp32 } } } */
+/* { dg-final { scan-assembler-times "stp\td\[0-9\]+, d\[0-9\]+" 2 } } */
+/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]+" 2 } } */
+/* { dg-final { scan-assembler-not "ins\t" } } */