[AArch64] PR rtl-optimization/68664 Implement TARGET_SCHED_CAN_SPECULATE_INSN hook

	PR rtl-optimization/68664
	* config/aarch64/aarch64.c (aarch64_sched_can_speculate_insn):
	New function.
	(TARGET_SCHED_CAN_SPECULATE_INSN): Define.

From-SVN: r245424

gcc/ChangeLog

+2017-02-14  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR rtl-optimization/68664
+	* config/aarch64/aarch64.c (aarch64_sched_can_speculate_insn):
+	New function.
+	(TARGET_SCHED_CAN_SPECULATE_INSN): Define.
+
 2017-02-14  Amit Pawar  <amit.pawar@amd.com>
 
 	* config/i386/i386.c (znver1_cost): Fix the alignment for function and

gcc/config/aarch64/aarch64.c

@@ -14682,6 +14682,35 @@ aarch64_excess_precision (enum excess_precision_type type)
   return FLT_EVAL_METHOD_UNPREDICTABLE;
 }
 
+/* Implement TARGET_SCHED_CAN_SPECULATE_INSN.  Return true if INSN can be
+   scheduled for speculative execution.  Reject the long-running division
+   and square-root instructions.  */
+
+static bool
+aarch64_sched_can_speculate_insn (rtx_insn *insn)
+{
+  switch (get_attr_type (insn))
+    {
+      case TYPE_SDIV:
+      case TYPE_UDIV:
+      case TYPE_FDIVS:
+      case TYPE_FDIVD:
+      case TYPE_FSQRTS:
+      case TYPE_FSQRTD:
+      case TYPE_NEON_FP_SQRT_S:
+      case TYPE_NEON_FP_SQRT_D:
+      case TYPE_NEON_FP_SQRT_S_Q:
+      case TYPE_NEON_FP_SQRT_D_Q:
+      case TYPE_NEON_FP_DIV_S:
+      case TYPE_NEON_FP_DIV_D:
+      case TYPE_NEON_FP_DIV_S_Q:
+      case TYPE_NEON_FP_DIV_D_Q:
+	return false;
+      default:
+	return true;
+    }
+}
+
 /* Target-specific selftests.  */
 
 #if CHECKING_P
@@ -15070,6 +15099,9 @@ aarch64_libgcc_floating_mode_supported_p
 #define TARGET_USE_BY_PIECES_INFRASTRUCTURE_P \
   aarch64_use_by_pieces_infrastructure_p
 
+#undef TARGET_SCHED_CAN_SPECULATE_INSN
+#define TARGET_SCHED_CAN_SPECULATE_INSN aarch64_sched_can_speculate_insn
+
 #undef TARGET_CAN_USE_DOLOOP_P
 #define TARGET_CAN_USE_DOLOOP_P can_use_doloop_if_innermost