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re PR middle-end/26565 (Unaligned accesses with __attribute__(packed) and memcpy)

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2006-03-10  Richard Guenther  <rguenther@suse.de>

	PR middle-end/26565
	* builtins.c (get_pointer_alignment): Handle component
	references for field alignment.

	* gcc.dg/torture/pr26565.c: New testcase.

From-SVN: r111934
This commit is contained in:
Richard Guenther 2006-03-10 16:44:01 +00:00 committed by Richard Biener
parent 8c1aaf261b
commit 891c0eeed7
4 changed files with 49 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2006-03-10 Richard Guenther <rguenther@suse.de>
PR middle-end/26565
* builtins.c (get_pointer_alignment): Handle component
references for field alignment.
2006-03-10 J"orn Rennecke <joern.rennecke@st.com>
* config.gcc (sh*-superh-elf, sh*elf (newlib)): Use newlib.h

14
gcc/builtins.c
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@ -275,15 +275,21 @@ get_pointer_alignment (tree exp, unsigned int max_align)
case ADDR_EXPR:
/* See what we are pointing at and look at its alignment. */
exp = TREE_OPERAND (exp, 0);
while (handled_component_p (exp))
{
if (TREE_CODE (exp) == COMPONENT_REF)
align = MIN (align, DECL_ALIGN (TREE_OPERAND (exp, 1)));
exp = TREE_OPERAND (exp, 0);
}
if (TREE_CODE (exp) == FUNCTION_DECL)
align = FUNCTION_BOUNDARY;
align = MIN (align, FUNCTION_BOUNDARY);
else if (DECL_P (exp))
align = DECL_ALIGN (exp);
align = MIN (align, DECL_ALIGN (exp));
#ifdef CONSTANT_ALIGNMENT
else if (CONSTANT_CLASS_P (exp))
align = CONSTANT_ALIGNMENT (exp, align);
align = MIN (align, (unsigned)CONSTANT_ALIGNMENT (exp, align));
#endif
return MIN (align, max_align);
return align;
default:
return align;

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2006-03-10 Richard Guenther <rguenther@suse.de>
PR middle-end/26565
* gcc.dg/torture/pr26565.c: New testcase.
2006-03-09 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libgfortran/26499

28
gcc/testsuite/gcc.dg/torture/pr26565.c Normal file
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@ -0,0 +1,28 @@
/* { dg-do run } */
void *memcpy(void *dest, const void *src, __SIZE_TYPE__ n);
struct timeval {
long tv_sec;
};
struct outdata {
long align;
char seq;
struct timeval tv __attribute__((packed));
};
void send_probe(struct outdata *outdata, struct timeval *tp) __attribute__((noinline));
void send_probe(struct outdata *outdata, struct timeval *tp)
{
memcpy(&outdata->tv, tp, sizeof outdata->tv);
}
struct timeval t;
struct outdata outdata;
int main()
{
send_probe(&outdata, &t);
return 0;
}