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fold-const.c (fold_binary): Revert removing of index +p PTR

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2007-08-21  Richard Guenther  <rguenther@suse.de>

        * fold-const.c (fold_binary): Revert removing of index +p PTR
        * folding.

        * gcc.dg/pointer-arith-10.c: New testcase.

From-SVN: r127660
This commit is contained in:
Richard Guenther 2007-08-21 09:18:15 +00:00 • committed by Richard Biener
parent 8015455a87
commit f7d1e0c6cb
4 changed files with 25 additions and 0 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2007-08-21 Richard Guenther <rguenther@suse.de>
* fold-const.c (fold_binary): Revert removing of index +p PTR folding.
2007-08-21 Richard Guenther <rguenther@suse.de>
PR middle-end/33122

7
gcc/fold-const.c
View file

@ -9528,6 +9528,13 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
fold_convert (sizetype, arg1),
fold_convert (sizetype, arg0)));
/* index +p PTR -> PTR +p index */
if (POINTER_TYPE_P (TREE_TYPE (arg1))
&& INTEGRAL_TYPE_P (TREE_TYPE (arg0)))
return fold_build2 (POINTER_PLUS_EXPR, type,
fold_convert (type, arg1),
fold_convert (sizetype, arg0));
/* (PTR +p B) +p A -> PTR +p (B + A) */
if (TREE_CODE (arg0) == POINTER_PLUS_EXPR)
{

4
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,7 @@
2007-08-21 Richard Guenther <rguenther@suse.de>
* gcc.dg/pointer-arith-10.c: New testcase.
2007-08-21 Richard Guenther <rguenther@suse.de>
PR middle-end/33122

10
gcc/testsuite/gcc.dg/pointer-arith-10.c Normal file
View file

@ -0,0 +1,10 @@
/* { dg-do compile } */
/* { dg-options "-fdump-tree-original" } */
char *foo(char *p, __SIZE_TYPE__ i)
{
return (char *)i + (__SIZE_TYPE__)p;
}
/* { dg-final { scan-tree-dump "p +" "original" } } */
/* { dg-final { cleanup-tree-dump "original" } } */