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re PR tree-optimization/15419 (memcpy pessimization)

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2011-05-23  Richard Guenther  <rguenther@suse.de>

	PR middle-end/15419
	* builtins.c (fold_builtin_memory_op): Be less restrictive about
	what pointer types we accept for folding.

	* gcc.dg/memcpy-3.c: New testcase.

From-SVN: r174065
This commit is contained in:
Richard Guenther 2011-05-23 12:03:19 +00:00 • committed by Richard Biener
parent c80286502f
commit 9a9822e13e
4 changed files with 31 additions and 11 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2011-05-23 Richard Guenther <rguenther@suse.de>
PR middle-end/15419
* builtins.c (fold_builtin_memory_op): Be less restrictive about
what pointer types we accept for folding.
2011-05-23 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* gthr-gnat.c: Remove.

18
gcc/builtins.c
View file

@ -8509,6 +8509,9 @@ fold_builtin_memory_op (location_t loc, tree dest, tree src,
Perhaps we ought to inherit type from non-VOID argument here? */
STRIP_NOPS (src);
STRIP_NOPS (dest);
if (!POINTER_TYPE_P (TREE_TYPE (src))
|| !POINTER_TYPE_P (TREE_TYPE (dest)))
return NULL_TREE;
/* As we fold (void *)(p + CST) to (void *)p + CST undo this here. */
if (TREE_CODE (src) == POINTER_PLUS_EXPR)
{
@ -8525,8 +8528,7 @@ fold_builtin_memory_op (location_t loc, tree dest, tree src,
dest = build1 (NOP_EXPR, TREE_TYPE (tem), dest);
}
srctype = TREE_TYPE (TREE_TYPE (src));
if (srctype
&& TREE_CODE (srctype) == ARRAY_TYPE
if (TREE_CODE (srctype) == ARRAY_TYPE
&& !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len))
{
srctype = TREE_TYPE (srctype);
@ -8534,21 +8536,15 @@ fold_builtin_memory_op (location_t loc, tree dest, tree src,
src = build1 (NOP_EXPR, build_pointer_type (srctype), src);
}
desttype = TREE_TYPE (TREE_TYPE (dest));
if (desttype
&& TREE_CODE (desttype) == ARRAY_TYPE
if (TREE_CODE (desttype) == ARRAY_TYPE
&& !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len))
{
desttype = TREE_TYPE (desttype);
STRIP_NOPS (dest);
dest = build1 (NOP_EXPR, build_pointer_type (desttype), dest);
}
if (!srctype || !desttype
|| TREE_ADDRESSABLE (srctype)
|| TREE_ADDRESSABLE (desttype)
|| !TYPE_SIZE_UNIT (srctype)
|| !TYPE_SIZE_UNIT (desttype)
|| TREE_CODE (TYPE_SIZE_UNIT (srctype)) != INTEGER_CST
|| TREE_CODE (TYPE_SIZE_UNIT (desttype)) != INTEGER_CST)
if (TREE_ADDRESSABLE (srctype)
|| TREE_ADDRESSABLE (desttype))
return NULL_TREE;
src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2011-05-23 Richard Guenther <rguenther@suse.de>
PR middle-end/15419
* gcc.dg/memcpy-3.c: New testcase.
2011-05-23 Jakub Jelinek <jakub@redhat.com>
PR middle-end/48973

13
gcc/testsuite/gcc.dg/memcpy-3.c Normal file
View file

@ -0,0 +1,13 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized" } */
int get_int(const void *p)
{
int w;
__builtin_memcpy(&w, p, sizeof (int));
return w;
}
/* { dg-final { scan-tree-dump-not "memcpy" "optimized" } } */
/* { dg-final { scan-tree-dump-times "MEM" 1 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */