[AArch64] Add attribute for compatibility with ARM pipeline models

gcc/

	* config/aarch64/aarch64.md (predicated): Copy attribute from
	"arm.md".
	* config/arm/arm.md (predicated): Added description.

From-SVN: r230666

gcc/ChangeLog

+2015-11-20  Evandro Menezes  <e.menezes@samsung.com>
+
+	* config/aarch64/aarch64.md (predicated): Copy attribute from
+	"arm.md".
+	* config/arm/arm.md (predicated): Added description.
+
 2015-11-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/arm/arm.c (arm_option_override): Require TARGET_32BIT

gcc/config/aarch64/aarch64.md

@@ -195,6 +195,10 @@
 ;; 1 :=: yes
 (define_attr "far_branch" "" (const_int 0))
 
+;; Strictly for compatibility with AArch32 in pipeline models, since AArch64 has
+;; no predicated insns.
+(define_attr "predicated" "yes,no" (const_string "no"))
+
 ;; -------------------------------------------------------------------
 ;; Pipeline descriptions and scheduling
 ;; -------------------------------------------------------------------

gcc/config/arm/arm.md

@@ -105,6 +105,9 @@
 (define_attr "fpu" "none,vfp"
   (const (symbol_ref "arm_fpu_attr")))
 
+; Predicated means that the insn form is conditionally executed based on a
+; predicate.  We default to 'no' because no Thumb patterns match this rule
+; and not all ARM insns do.
 (define_attr "predicated" "yes,no" (const_string "no"))
 
 ; LENGTH of an instruction (in bytes)