From: Mike Stump <mikestump@comcast.net>
Date: Mon, 17 Aug 2015 09:39:58 +0000 (+0000)
Subject: [ARM] arm memcpy of aligned data
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=48efbbe8a0b37d7da6a8bae0e28fccdeeaa82c63;p=gcc.git

[ARM] arm memcpy of aligned data

2015-08-17  Mike Stump  <mikestump@comcast.net>

	* config/arm/arm.c (arm_block_move_unaligned_straight):
	Emit normal move instead of unaligned load when source or destination
	are appropriately aligned.

2015-08-17 Mike Stump  <mikestump@comcast.net>
           Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* gcc.target/arm/memcpy-aligned-1.c: New test.

Co-Authored-By: Kyrylo Tkachov <kyrylo.tkachov@arm.com>

From-SVN: r226935
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 20b87d7cae9..66bfd50a546 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-08-17  Mike Stump  <mikestump@comcast.net>
+
+	* config/arm/arm.c (arm_block_move_unaligned_straight):
+	Emit normal move instead of unaligned load when source or destination
+	are appropriately aligned.
+
 2015-08-17  Richard Biener  <rguenther@suse.de>
 	    Naveen H.S  <Naveen.Hurugalawadi@caviumnetworks.com>
 
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 6e15bf272aa..8ded4946a6a 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -14412,7 +14412,10 @@ arm_block_move_unaligned_straight (rtx dstbase, rtx srcbase,
 				srcoffset + j * UNITS_PER_WORD - src_autoinc);
 	  mem = adjust_automodify_address (srcbase, SImode, addr,
 					   srcoffset + j * UNITS_PER_WORD);
-	  emit_insn (gen_unaligned_loadsi (regs[j], mem));
+	  if (src_aligned)
+	    emit_move_insn (regs[j], mem);
+	  else
+	    emit_insn (gen_unaligned_loadsi (regs[j], mem));
 	}
       srcoffset += words * UNITS_PER_WORD;
     }
@@ -14431,7 +14434,10 @@ arm_block_move_unaligned_straight (rtx dstbase, rtx srcbase,
 				dstoffset + j * UNITS_PER_WORD - dst_autoinc);
 	  mem = adjust_automodify_address (dstbase, SImode, addr,
 					   dstoffset + j * UNITS_PER_WORD);
-	  emit_insn (gen_unaligned_storesi (mem, regs[j]));
+	  if (dst_aligned)
+	    emit_move_insn (mem, regs[j]);
+	  else
+	    emit_insn (gen_unaligned_storesi (mem, regs[j]));
 	}
       dstoffset += words * UNITS_PER_WORD;
     }
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 28a231cc935..394a42fafdd 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-17 Mike Stump  <mikestump@comcast.net>
+           Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* gcc.target/arm/memcpy-aligned-1.c: New test.
+
 2015-08-16  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR fortran/54656
diff --git a/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c b/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c
new file mode 100644
index 00000000000..852b391388b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -save-temps" } */
+
+void *memcpy (void *dest, const void *src, unsigned int n);
+
+void foo (char *dst, int i)
+{
+  memcpy (dst, &i, sizeof (i));
+}
+
+/* { dg-final { scan-assembler-times "str\t" 1 } } */
+/* { dg-final { scan-assembler-not "ldr\t" } } */