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re PR tree-optimization/63530 (GCC generates incorrect aligned store on ARM after the loop is unrolled.)

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PR tree-optimization/63530
	tree-vect-data-refs.c (vect_create_addr_base_for_vector_ref): Set
	pointer alignment according to DR_MISALIGNMENT.
	gcc.dg/vect/pr63530.c: New testcase.

From-SVN: r216562
This commit is contained in:
Guozhi Wei 2014-10-22 15:56:59 +00:00 • committed by Wei Guozhi
parent 9612a39a41
commit 417dfefbdb
4 changed files with 46 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-10-22 Guozhi Wei <carrot@google.com>
PR tree-optimization/63530
tree-vect-data-refs.c (vect_create_addr_base_for_vector_ref): Set
pointer alignment according to DR_MISALIGNMENT.
2014-10-22 David Malcolm <dmalcolm@redhat.com>
* ipa-icf.c (ipa_icf_driver): Set optimizer to NULL when done.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-10-22 Guozhi Wei <carrot@google.com>
PR tree-optimization/63530
gcc.dg/vect/pr63530.c: New testcase.
2014-10-22 Richard Sandiford <richard.sandiford@arm.com>
* gcc.target/i386/conversion-2.c: New test.

30
gcc/testsuite/gcc.dg/vect/pr63530.c Normal file
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@ -0,0 +1,30 @@
/* { dg-options "-O2 -ftree-vectorize -funroll-loops --param \"max-completely-peeled-insns=400\"" } */
/* PR tree-optimization/63530 */
/* On armv7 hardware, following options cause run time failure */
/* -march=armv7-a -mfloat-abi=hard -mfpu=neon -marm -O2 -ftree-vectorize */
/* -funroll-loops --param "max-completely-peeled-insns=400" */
#include <stdlib.h>
typedef struct {
unsigned char map[256];
int i;
} A, *AP;
AP __attribute__ ((noinline))
foo (int n)
{
AP b = (AP)calloc (1, sizeof (A));
int i;
for (i = n; i < 256; i++)
b->map[i] = i;
return b;
}
int
main()
{
AP p = foo(3);
return p->map[30] - p->map[20] - p->map[10];
}

6
gcc/tree-vect-data-refs.c
View file

@ -3960,8 +3960,12 @@ vect_create_addr_base_for_vector_ref (gimple stmt,
&& TREE_CODE (addr_base) == SSA_NAME)
{
duplicate_ssa_name_ptr_info (addr_base, DR_PTR_INFO (dr));
if (offset)
unsigned int align = TYPE_ALIGN_UNIT (STMT_VINFO_VECTYPE (stmt_info));
int misalign = DR_MISALIGNMENT (dr);
if (offset || byte_offset || (misalign == -1))
mark_ptr_info_alignment_unknown (SSA_NAME_PTR_INFO (addr_base));
else
set_ptr_info_alignment (SSA_NAME_PTR_INFO (addr_base), align, misalign);
}
if (dump_enabled_p ())