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[ARM] arm memcpy of aligned data

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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
This commit is contained in:
Mike Stump 2015-08-17 09:39:58 +00:00 • committed by Kyrylo Tkachov
parent d202f9bdb4
commit 48efbbe8a0
4 changed files with 31 additions and 2 deletions
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6
gcc/ChangeLog
View file

@ -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>

10
gcc/config/arm/arm.c
View file

@ -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;
}

5
gcc/testsuite/ChangeLog
View file

@ -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

12
gcc/testsuite/gcc.target/arm/memcpy-aligned-1.c Normal file
View file

@ -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" } } */