[AArch64] Add a aarch64_sve_mode_p query

This patch adds an exported function for testing whether a mode is
an SVE mode.  The ACLE will make more use of it, but there's already
one place that can benefit.

2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64-protos.h (aarch64_sve_mode_p): Declare.
	* config/aarch64/aarch64.c (aarch64_sve_mode_p): New function.
	(aarch64_select_early_remat_modes): Use it.

From-SVN: r274523

gcc/ChangeLog

 2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* config/aarch64/aarch64-protos.h (aarch64_sve_mode_p): Declare.
+	* config/aarch64/aarch64.c (aarch64_sve_mode_p): New function.
+	(aarch64_select_early_remat_modes): Use it.
+
+2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* config/aarch64/aarch64.c (aarch64_simd_vector_alignment): Return
 	16 for SVE predicates even if they are fixed-length.
 

gcc/config/aarch64/aarch64-protos.h

@@ -475,6 +475,7 @@ bool aarch64_masks_and_shift_for_bfi_p (scalar_int_mode, unsigned HOST_WIDE_INT,
 bool aarch64_zero_extend_const_eq (machine_mode, rtx, machine_mode, rtx);
 bool aarch64_move_imm (HOST_WIDE_INT, machine_mode);
 opt_machine_mode aarch64_sve_pred_mode (unsigned int);
+bool aarch64_sve_mode_p (machine_mode);
 bool aarch64_sve_cnt_immediate_p (rtx);
 bool aarch64_sve_scalar_inc_dec_immediate_p (rtx);
 bool aarch64_sve_addvl_addpl_immediate_p (rtx);

gcc/config/aarch64/aarch64.c

@@ -1606,6 +1606,14 @@ aarch64_vector_data_mode_p (machine_mode mode)
   return aarch64_classify_vector_mode (mode) & VEC_ANY_DATA;
 }
 
+/* Return true if MODE is any form of SVE mode, including predicates,
+   vectors and structures.  */
+bool
+aarch64_sve_mode_p (machine_mode mode)
+{
+  return aarch64_classify_vector_mode (mode) & VEC_ANY_SVE;
+}
+
 /* Return true if MODE is an SVE data vector mode; either a single vector
    or a structure of vectors.  */
 static bool
@@ -19962,12 +19970,8 @@ aarch64_select_early_remat_modes (sbitmap modes)
   /* SVE values are not normally live across a call, so it should be
      worth doing early rematerialization even in VL-specific mode.  */
   for (int i = 0; i < NUM_MACHINE_MODES; ++i)
-    {
-      machine_mode mode = (machine_mode) i;
-      unsigned int vec_flags = aarch64_classify_vector_mode (mode);
-      if (vec_flags & VEC_ANY_SVE)
-	bitmap_set_bit (modes, i);
-    }
+    if (aarch64_sve_mode_p ((machine_mode) i))
+      bitmap_set_bit (modes, i);
 }
 
 /* Override the default target speculation_safe_value.  */