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re PR tree-optimization/49087 (crash in vect_is_slp_reduction)

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PR tree-optimization/49087
        * tree-vect-loop.c (vect_is_slp_reduction): Fail if
        LHS has no uses.

From-SVN: r174026
This commit is contained in:
Ira Rosen 2011-05-22 08:04:43 +00:00 committed by Ira Rosen
parent 5b018c651a
commit e38fdc948a
4 changed files with 55 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-05-22 Ira Rosen <ira.rosen@linaro.org>
PR tree-optimization/49087
* tree-vect-loop.c (vect_is_slp_reduction): Fail if
LHS has no uses.
2011-05-21 Jason Merrill <jason@redhat.com>
PR c++/49092

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-05-22 Ira Rosen <ira.rosen@linaro.org>
PR tree-optimization/49087
* gcc.dg/vect/O3-pr49087.c: New test.
2011-05-21 Jason Merrill <jason@redhat.com>
* g++.dg/debug/const5.C: New.

37
gcc/testsuite/gcc.dg/vect/O3-pr49087.c Normal file
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@ -0,0 +1,37 @@
/* { dg-do compile } */
static char func2() { }
struct S0
{
int t;
};
int g;
struct S0 s0;
int
foo (int arg)
{
int *ptr = &g;
int i, j;
for (i = 0; i < 10; i += 1)
{
for (j = 0; j < 1; j += 1)
{
int k;
if (arg)
{
int l;
for (k = 1; arg < 10; arg = func2 ())
{
return l;
}
}
*ptr = func2 () ^ s0.t;
}
}
}
/* { dg-final { cleanup-tree-dump "vect" } } */

8
gcc/tree-vect-loop.c
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@ -1704,7 +1704,7 @@ vect_is_slp_reduction (loop_vec_info loop_info, gimple phi, gimple first_stmt)
tree lhs;
imm_use_iterator imm_iter;
use_operand_p use_p;
int nloop_uses, size = 0;
int nloop_uses, size = 0, nuses;
bool found = false;
if (loop != vect_loop)
@ -1715,9 +1715,11 @@ vect_is_slp_reduction (loop_vec_info loop_info, gimple phi, gimple first_stmt)
while (1)
{
nloop_uses = 0;
nuses = 0;
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
{
use_stmt = USE_STMT (use_p);
nuses++;
if (is_gimple_debug (use_stmt))
continue;
@ -1739,6 +1741,10 @@ vect_is_slp_reduction (loop_vec_info loop_info, gimple phi, gimple first_stmt)
return false;
}
/* We reached a statement with no uses. */
if (nuses == 0)
return false;
if (found)
break;