From: Chung-Lin Tang <cltang@codesourcery.com>
Date: Wed, 20 Apr 2011 16:48:28 +0000 (+0000)
Subject: arm.c (arm_legitimize_reload_address): For NEON quad-word modes, reduce to 9-bit... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=01475747254ace9b52d6c62779639bffbf5b6c45;p=gcc.git

arm.c (arm_legitimize_reload_address): For NEON quad-word modes, reduce to 9-bit index range when above 1016 limit.

2011-04-20  Chung-Lin Tang  <cltang@codesourcery.com>

	* config/arm/arm.c (arm_legitimize_reload_address): For NEON
	quad-word modes, reduce to 9-bit index range when above 1016
	limit.

From-SVN: r172779
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 455bfeb58bc..c70cdb62c2d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-04-20  Chung-Lin Tang  <cltang@codesourcery.com>
+
+	* config/arm/arm.c (arm_legitimize_reload_address): For NEON
+	quad-word modes, reduce to 9-bit index range when above 1016
+	limit.
+
 2011-04-20  Andrew Stubbs  <ams@codesourcery.com>
 
 	* config/arm/arm.c (arm_gen_constant): Move movw support ....
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 38aa390ab6e..46255cbeebb 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -6330,7 +6330,15 @@ arm_legitimize_reload_address (rtx *p,
        : 0)
 
       if (coproc_p)
-	low = SIGN_MAG_LOW_ADDR_BITS (val, 10);
+	{
+	  low = SIGN_MAG_LOW_ADDR_BITS (val, 10);
+
+	  /* NEON quad-word load/stores are made of two double-word accesses,
+	     so the valid index range is reduced by 8. Treat as 9-bit range if
+	     we go over it.  */
+	  if (TARGET_NEON && VALID_NEON_QREG_MODE (mode) && low >= 1016)
+	    low = SIGN_MAG_LOW_ADDR_BITS (val, 9);
+	}
       else if (GET_MODE_SIZE (mode) == 8)
 	{
 	  if (TARGET_LDRD)