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re PR middle-end/70424 (Pointer derived from integer gets reduced alignment)

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2016-03-29  Richard Biener  <rguenther@suse.de>

	PR middle-end/70424
	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Always
	use alignment returned by get_pointer_alignment_1 if it is
	bigger than BITS_PER_UNIT.
	* builtins.c (get_pointer_alignment_1): Do not return true
	for alignment extracted from SSA info.

From-SVN: r234517
This commit is contained in:
Richard Biener 2016-03-29 12:36:39 +00:00 committed by Richard Biener
parent dc2e899536
commit 5f9a167b52
3 changed files with 12 additions and 3 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2016-03-29 Richard Biener <rguenther@suse.de>
PR middle-end/70424
* ipa-prop.c (ipa_compute_jump_functions_for_edge): Always
use alignment returned by get_pointer_alignment_1 if it is
bigger than BITS_PER_UNIT.
* builtins.c (get_pointer_alignment_1): Do not return true
for alignment extracted from SSA info.
2016-03-28 James Bowman <james.bowman@ftdichip.com>
* config/ft32/ft32.opt (mnodiv): New.

2
gcc/builtins.c
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@ -463,7 +463,7 @@ get_pointer_alignment_1 (tree exp, unsigned int *alignp,
if (*alignp == 0)
*alignp = 1u << (HOST_BITS_PER_INT - 1);
/* We cannot really tell whether this result is an approximation. */
return true;
return false;
}
else
{

4
gcc/ipa-prop.c
View File

@ -1639,11 +1639,11 @@ ipa_compute_jump_functions_for_edge (struct ipa_func_body_info *fbi,
unsigned HOST_WIDE_INT hwi_bitpos;
unsigned align;
if (get_pointer_alignment_1 (arg, &align, &hwi_bitpos)
get_pointer_alignment_1 (arg, &align, &hwi_bitpos);
if (align > BITS_PER_UNIT
&& align % BITS_PER_UNIT == 0
&& hwi_bitpos % BITS_PER_UNIT == 0)
{
gcc_checking_assert (align != 0);
jfunc->alignment.known = true;
jfunc->alignment.align = align / BITS_PER_UNIT;
jfunc->alignment.misalign = hwi_bitpos / BITS_PER_UNIT;