aarch64.c (doloop_end): New pattern.

       * config/aarch64/aarch64.c (doloop_end): New pattern.
       * config/aarch64/aarch64.md (TARGET_CAN_USE_DOLOOP_P): Implement.

From-SVN: r217717

gcc/ChangeLog

+2014-11-18  Felix Yang  <felix.yang@huawei.com>
+
+	* config/aarch64/aarch64.c (doloop_end): New pattern.
+	* config/aarch64/aarch64.md (TARGET_CAN_USE_DOLOOP_P): Implement.
+
 2014-11-18  Jason Merrill  <jason@redhat.com>
 
 	* tree.c (warn_deprecated_use): Show declaration with inform.

gcc/config/aarch64/aarch64.c

@@ -10605,6 +10605,9 @@ aarch64_gen_ccmp_next (rtx prev, int cmp_code, rtx op0, rtx op1, int bit_code)
 #define TARGET_USE_BY_PIECES_INFRASTRUCTURE_P \
   aarch64_use_by_pieces_infrastructure_p
 
+#undef TARGET_CAN_USE_DOLOOP_P
+#define TARGET_CAN_USE_DOLOOP_P can_use_doloop_if_innermost
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-aarch64.h"

gcc/config/aarch64/aarch64.md

@@ -4169,6 +4169,43 @@
   [(set_attr "type" "mrs")])
 
 
+;; Define the subtract-one-and-jump insns so loop.c
+;; knows what to generate.
+(define_expand "doloop_end"
+  [(use (match_operand 0 "" ""))      ; loop pseudo
+   (use (match_operand 1 "" ""))]     ; label
+  "optimize > 0 && flag_modulo_sched"
+{
+  rtx s0;
+  rtx bcomp;
+  rtx loc_ref;
+  rtx cc_reg;
+  rtx insn;
+  rtx cmp;
+
+  /* Currently SMS relies on the do-loop pattern to recognize loops
+     where (1) the control part consists of all insns defining and/or
+     using a certain 'count' register and (2) the loop count can be
+     adjusted by modifying this register prior to the loop.
+     ??? The possible introduction of a new block to initialize the
+     new IV can potentially affect branch optimizations.  */
+
+  if (GET_MODE (operands[0]) != DImode)
+    FAIL;
+
+  s0 = operands [0];
+  insn = emit_insn (gen_adddi3_compare0 (s0, s0, GEN_INT (-1)));
+
+  cmp = XVECEXP (PATTERN (insn), 0, 0);
+  cc_reg = SET_DEST (cmp);
+  bcomp = gen_rtx_NE (VOIDmode, cc_reg, const0_rtx);
+  loc_ref = gen_rtx_LABEL_REF (VOIDmode, operands [1]);
+  emit_jump_insn (gen_rtx_SET (VOIDmode, pc_rtx,
+			       gen_rtx_IF_THEN_ELSE (VOIDmode, bcomp,
+						     loc_ref, pc_rtx)));
+  DONE;
+})
+
 ;; AdvSIMD Stuff
 (include "aarch64-simd.md")