From: Renlin Li <renlin.li@arm.com>
Date: Tue, 5 May 2015 10:16:46 +0000 (+0000)
Subject: [PATCH][AARCH64]Use mov for add with large immediate.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=53e38f0275f495b20e274cedeaf8647b8005feca;p=gcc.git

[PATCH][AARCH64]Use mov for add with large immediate.

gcc/

2015-05-05  Renlin Li  <renlin.li@arm.com>

	* config/aarch64/aarch64.md (add<mode>3): Use mov when allowed.

From-SVN: r222800
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 83509a04b39..5667dd45f73 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2015-05-05  Renlin Li  <renlin.li@arm.com>
+
+	* config/aarch64/aarch64.md (add<mode>3): Use mov when allowed.
+
 2015-05-05  Yvan Roux  <yvan.roux@linaro.org>
 
 	* config/aarch64/aarch64-elf-raw.h (CA53_ERR_843419_SPEC): Define.
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 11c470951dc..1c2c5fba4c3 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -1414,18 +1414,28 @@
   "
   if (! aarch64_plus_operand (operands[2], VOIDmode))
     {
-      rtx subtarget = ((optimize && can_create_pseudo_p ())
-		       ? gen_reg_rtx (<MODE>mode) : operands[0]);
       HOST_WIDE_INT imm = INTVAL (operands[2]);
 
-      if (imm < 0)
-	imm = -(-imm & ~0xfff);
+      if (aarch64_move_imm (imm, <MODE>mode) && can_create_pseudo_p ())
+        {
+	  rtx tmp = gen_reg_rtx (<MODE>mode);
+	  emit_move_insn (tmp, operands[2]);
+	  operands[2] = tmp;
+        }
       else
-        imm &= ~0xfff;
-
-      emit_insn (gen_add<mode>3 (subtarget, operands[1], GEN_INT (imm)));
-      operands[1] = subtarget;
-      operands[2] = GEN_INT (INTVAL (operands[2]) - imm);
+        {
+	  rtx subtarget = ((optimize && can_create_pseudo_p ())
+			   ? gen_reg_rtx (<MODE>mode) : operands[0]);
+
+	  if (imm < 0)
+	    imm = -(-imm & ~0xfff);
+	  else
+	    imm &= ~0xfff;
+
+	  emit_insn (gen_add<mode>3 (subtarget, operands[1], GEN_INT (imm)));
+	  operands[1] = subtarget;
+	  operands[2] = GEN_INT (INTVAL (operands[2]) - imm);
+        }
     }
   "
 )