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re PR c/60819 (dse1 removing not-dead insn (aliasing issue?))

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2014-04-14  Richard Biener  <rguenther@suse.de>
	Marc Glisse  <marc.glisse@inria.fr>

	PR c/60819
	c-family/
	* c-common.c (convert_vector_to_pointer_for_subscript): Properly
	apply may-alias the scalar pointer type when applicable.

	* gcc.target/i386/vec-may_alias.c: New testcase.

Co-Authored-By: Marc Glisse <marc.glisse@inria.fr>

From-SVN: r209365
This commit is contained in:
Richard Biener 2014-04-14 11:49:42 +00:00 committed by Richard Biener
parent 7279878442
commit b0f1bf3681
4 changed files with 52 additions and 1 deletions
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7
gcc/c-family/ChangeLog
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@ -1,3 +1,10 @@
2014-04-14 Richard Biener <rguenther@suse.de>
Marc Glisse <marc.glisse@inria.fr>
PR c/60819
* c-common.c (convert_vector_to_pointer_for_subscript): Properly
apply may-alias the scalar pointer type when applicable.
2014-04-12 Igor Zamyatin <igor.zamyatin@intel.com>
PR middle-end/60467

15
gcc/c-family/c-common.c
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@ -11784,8 +11784,21 @@ convert_vector_to_pointer_for_subscript (location_t loc,
c_common_mark_addressable_vec (*vecp);
type = build_qualified_type (TREE_TYPE (type), TYPE_QUALS (type));
type = build_pointer_type (type);
type1 = build_pointer_type (TREE_TYPE (*vecp));
bool ref_all = TYPE_REF_CAN_ALIAS_ALL (type1);
if (!ref_all
&& !DECL_P (*vecp))
{
/* If the original vector isn't declared may_alias and it
isn't a bare vector look if the subscripting would
alias the vector we subscript, and if not, force ref-all. */
alias_set_type vecset = get_alias_set (*vecp);
alias_set_type sset = get_alias_set (type);
if (!alias_sets_must_conflict_p (sset, vecset)
&& !alias_set_subset_of (sset, vecset))
ref_all = true;
}
type = build_pointer_type_for_mode (type, ptr_mode, ref_all);
*vecp = build1 (ADDR_EXPR, type1, *vecp);
*vecp = convert (type, *vecp);
}

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2014-04-14 Richard Biener <rguenther@suse.de>
Marc Glisse <marc.glisse@inria.fr>
PR c/60819
* gcc.target/i386/vec-may_alias.c: New testcase.
2014-04-14 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* lib/target-supports.exp

25
gcc/testsuite/gcc.target/i386/vec-may_alias.c Normal file
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@ -0,0 +1,25 @@
/* { dg-do run } */
/* { dg-options "-O2 -w -Wno-abi" } */
typedef int v2si __attribute__ ((vector_size (8)));
typedef short v4hi __attribute__ ((vector_size (8)));
typedef short v4hia __attribute__ ((vector_size (8), may_alias));
__attribute__ ((noinline, noclone))
int f (v2si A, int N)
{ return ((v4hia)A)[N]; }
__attribute__ ((noinline, noclone))
int g (v2si A, int N)
{ return ((v4hi)A)[N]; }
int main()
{
v2si x = { 0, 0 }, y = { 1, 1 };
if (f (x, 0) || f (x, 1) || f (x, 2) || f (x, 3))
__builtin_abort ();
if (g (y, 0) != 1 || g (y, 1) || g (y, 2) != 1 || g (y, 3))
__builtin_abort ();
return 0;
}