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re PR tree-optimization/23048 (ICE in get_loop_body with -O1 -ftree-vectorize on 4.1.x)

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PR tree-optimization/23048
       * tree-if-conv.c (if_convertible_bb_p): Supply basic_block as
       third parameter. Check whether latch is dominated by exit
       block or not.
       (if_convertible_loop_p): Supply exit block itself to
       if_convertible_bb_p.

       * gcc.dg/tree-ssa/pr23048.c: New test.

From-SVN: r103287
This commit is contained in:
Devang Patel 2005-08-19 10:54:16 -07:00 committed by Devang Patel
parent e55ef7f426
commit 3d91803a0b
4 changed files with 39 additions and 6 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2005-08-19 Devang Patel <dpatel@apple.com>
PR tree-optimization/23048
* tree-if-conv.c (if_convertible_bb_p): Supply basic_block as
third parameter. Check whether latch is dominated by exit
block or not.
(if_convertible_loop_p): Supply exit block itself to
if_convertible_bb_p.
2005-08-19 Richard Earnshaw <richard.earnshaw@arm.com>
PR target/23473

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2005-08-19 Devang Patel <dpatel@apple.com>
PR tree-optimization/23048
* gcc.dg/tree-ssa/pr23048.c: New test.
2005-08-19 Andrew Pinski <pinskia@physics.uc.edu>
PR middle-end/20624

11
gcc/testsuite/gcc.dg/tree-ssa/pr23048.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O1 -ftree-vectorize" } */
void f(unsigned char *mem)
{
int i;
for(i=0;i<4;i++) {
while(mem[i]==0) ;
}
}

20
gcc/tree-if-conv.c
View File

@ -110,7 +110,7 @@ static void tree_if_convert_cond_expr (struct loop *, tree, tree,
static bool if_convertible_phi_p (struct loop *, basic_block, tree);
static bool if_convertible_modify_expr_p (struct loop *, basic_block, tree);
static bool if_convertible_stmt_p (struct loop *, basic_block, tree);
static bool if_convertible_bb_p (struct loop *, basic_block, bool);
static bool if_convertible_bb_p (struct loop *, basic_block, basic_block);
static bool if_convertible_loop_p (struct loop *, bool);
static void add_to_predicate_list (basic_block, tree);
static tree add_to_dst_predicate_list (struct loop * loop, basic_block, tree, tree,
@ -437,7 +437,7 @@ if_convertible_stmt_p (struct loop *loop, basic_block bb, tree stmt)
BB is inside loop LOOP. */
static bool
if_convertible_bb_p (struct loop *loop, basic_block bb, bool exit_bb_seen)
if_convertible_bb_p (struct loop *loop, basic_block bb, basic_block exit_bb)
{
edge e;
edge_iterator ei;
@ -445,7 +445,7 @@ if_convertible_bb_p (struct loop *loop, basic_block bb, bool exit_bb_seen)
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "----------[%d]-------------\n", bb->index);
if (exit_bb_seen)
if (exit_bb)
{
if (bb != loop->latch)
{
@ -459,6 +459,14 @@ if_convertible_bb_p (struct loop *loop, basic_block bb, bool exit_bb_seen)
fprintf (dump_file, "non empty basic block after exit bb\n");
return false;
}
else if (bb == loop->latch
&& bb != exit_bb
&& !dominated_by_p (CDI_DOMINATORS, bb, exit_bb))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "latch is not dominated by exit_block\n");
return false;
}
}
/* Be less adventurous and handle only normal edges. */
@ -494,7 +502,7 @@ if_convertible_loop_p (struct loop *loop, bool for_vectorizer ATTRIBUTE_UNUSED)
unsigned int i;
edge e;
edge_iterator ei;
bool exit_bb_seen = false;
basic_block exit_bb = NULL;
/* Handle only inner most loop. */
if (!loop || loop->inner)
@ -547,7 +555,7 @@ if_convertible_loop_p (struct loop *loop, bool for_vectorizer ATTRIBUTE_UNUSED)
{
bb = ifc_bbs[i];
if (!if_convertible_bb_p (loop, bb, exit_bb_seen))
if (!if_convertible_bb_p (loop, bb, exit_bb))
return false;
/* Check statements. */
@ -562,7 +570,7 @@ if_convertible_loop_p (struct loop *loop, bool for_vectorizer ATTRIBUTE_UNUSED)
return false;
if (bb_with_exit_edge_p (loop, bb))
exit_bb_seen = true;
exit_bb = bb;
}
/* OK. Did not find any potential issues so go ahead in if-convert