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re PR middle-end/66110 (uint8_t memory access not optimized)

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2015-05-13  Richard Biener  <rguenther@suse.de>

	PR middle-end/66110
	* alias.c (alias_sets_conflict_p): Do not treat has_zero_child
	specially.
	* Makefile.in (dfp.o-warn): Add -Wno-strict-aliasing.

	* gcc.dg/alias-2.c: Adjust.
	* gcc.dg/tree-ssa/ssa-dse-17.c: New testcase.

From-SVN: r223126
This commit is contained in:
Richard Biener 2015-05-13 10:53:42 +00:00 committed by Richard Biener
parent 6ef9367656
commit 2ae1d1b8b2
6 changed files with 37 additions and 5 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2015-05-13 Richard Biener <rguenther@suse.de>
PR middle-end/66110
* alias.c (alias_sets_conflict_p): Do not treat has_zero_child
specially.
* Makefile.in (dfp.o-warn): Add -Wno-strict-aliasing.
2015-05-13 Michael Haubenwallner <michael.haubenwallner@ssi-schaefer.com>
* doc/install.texi: Bump latest automake 1.11 version to 1.11.6.

1
gcc/Makefile.in
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@ -211,6 +211,7 @@ libgcov-driver-tool.o-warn = -Wno-error
libgcov-merge-tool.o-warn = -Wno-error
gimple-match.o-warn = -Wno-unused
generic-match.o-warn = -Wno-unused
dfp.o-warn = -Wno-strict-aliasing
# All warnings have to be shut off in stage1 if the compiler used then
# isn't gcc; configure determines that. WARN_CFLAGS will be either

6
gcc/alias.c
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@ -470,15 +470,13 @@ alias_sets_conflict_p (alias_set_type set1, alias_set_type set2)
/* See if the first alias set is a subset of the second. */
ase = get_alias_set_entry (set1);
if (ase != 0
&& (ase->has_zero_child
|| ase->children->get (set2)))
&& ase->children->get (set2))
return 1;
/* Now do the same, but with the alias sets reversed. */
ase = get_alias_set_entry (set2);
if (ase != 0
&& (ase->has_zero_child
|| ase->children->get (set1)))
&& ase->children->get (set1))
return 1;
/* The two alias sets are distinct and neither one is the

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2015-05-13 Richard Biener <rguenther@suse.de>
PR middle-end/66110
* gcc.dg/alias-2.c: Adjust.
* gcc.dg/tree-ssa/ssa-dse-17.c: New testcase.
2015-05-13 Ilya Enkovich <ilya.enkovich@intel.com>
PR target/65103

2
gcc/testsuite/gcc.dg/alias-2.c
View File

@ -11,6 +11,6 @@ struct foo {
int
sub1 (long long int foobar)
{
struct foo *tmp = (struct foo *) &foobar; // { dg-warning "type-punned pointer might" "" }
struct foo *tmp = (struct foo *) &foobar; // { dg-warning "type-punned pointer will" "" }
return tmp->i;
}

20
gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-17.c Normal file
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@ -0,0 +1,20 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-dse1" } */
struct s1 {
unsigned short f1;
unsigned char f2;
};
struct s2 {
struct s1 *p1;
};
void f1(struct s2 *p)
{
p->p1->f2 = 9;
p->p1->f2 = 10;
}
/* { dg-final { scan-tree-dump-times "f2 =" 1 "dse1" } } */
/* { dg-final { cleanup-tree-dump "dse1" } } */