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re PR tree-optimization/30771 (ice for legal code with -O2 -ftree-vectorize)

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PR tree-optimization/30771
        * tree-vect-analyze.c (vect_determine_vectorization_factor): Traverse
        also phi nodes.
        (vect_analyze_operations): Induction phis can now be marked as
        used_in_loop.
        (vect_mark_stmts_to_be_vectorized): No special treatment for phis.
        Update documentation accordingly.

From-SVN: r121950
This commit is contained in:
Dorit Nuzman 2007-02-14 14:10:57 +00:00 committed by Dorit Nuzman
parent 09201a0980
commit 932eea3d18
4 changed files with 100 additions and 27 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2007-12-14 Dorit Nuzman <dorit@il.ibm.com>
PR tree-optimization/30771
* tree-vect-analyze.c (vect_determine_vectorization_factor): Traverse
also phi nodes.
(vect_analyze_operations): Induction phis can now be marked as
used_in_loop.
(vect_mark_stmts_to_be_vectorized): No special treatment for phis.
Update documentation accordingly.
2007-02-14 Nick Clifton <nickc@redhat.com>
* builtin-types.def (DEF_FUNCTION_TYPE_x): Do not imply that at

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-02-14 Dorit Nuzman <dorit@il.ibm.com>
PR tree-optimization/30771
* gcc.dg/vect/pr30771.c: New test.
2007-02-13 Ian Lance Taylor <iant@google.com>
* gcc.dg/Wstrict-overflow-1.c: New test.

18
gcc/testsuite/gcc.dg/vect/pr30771.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do compile } */
/* { dg-require-effective-target vect_int } */
int a[128];
int
main()
{
short i;
for (i=0; i<64; i++){
a[i] = (int)i;
}
return 0;
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */

94
gcc/tree-vect-analyze.c
View File

@ -97,8 +97,12 @@ vect_determine_vectorization_factor (loop_vec_info loop_vinfo)
int nbbs = loop->num_nodes;
block_stmt_iterator si;
unsigned int vectorization_factor = 0;
int i;
tree scalar_type;
tree phi;
tree vectype;
unsigned int nunits;
stmt_vec_info stmt_info;
int i;
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "=== vect_determine_vectorization_factor ===");
@ -107,12 +111,67 @@ vect_determine_vectorization_factor (loop_vec_info loop_vinfo)
{
basic_block bb = bbs[i];
for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
{
stmt_info = vinfo_for_stmt (phi);
if (vect_print_dump_info (REPORT_DETAILS))
{
fprintf (vect_dump, "==> examining phi: ");
print_generic_expr (vect_dump, phi, TDF_SLIM);
}
gcc_assert (stmt_info);
/* Two cases of "relevant" phis: those that define an
induction that is used in the loop, and those that
define a reduction. */
if ((STMT_VINFO_RELEVANT (stmt_info) == vect_used_in_loop
&& STMT_VINFO_DEF_TYPE (stmt_info) == vect_induction_def)
|| (STMT_VINFO_RELEVANT (stmt_info) == vect_used_by_reduction
&& STMT_VINFO_DEF_TYPE (stmt_info) == vect_reduction_def))
{
gcc_assert (!STMT_VINFO_VECTYPE (stmt_info));
scalar_type = TREE_TYPE (PHI_RESULT (phi));
if (vect_print_dump_info (REPORT_DETAILS))
{
fprintf (vect_dump, "get vectype for scalar type: ");
print_generic_expr (vect_dump, scalar_type, TDF_SLIM);
}
vectype = get_vectype_for_scalar_type (scalar_type);
if (!vectype)
{
if (vect_print_dump_info (REPORT_UNVECTORIZED_LOOPS))
{
fprintf (vect_dump,
"not vectorized: unsupported data-type ");
print_generic_expr (vect_dump, scalar_type, TDF_SLIM);
}
return false;
}
STMT_VINFO_VECTYPE (stmt_info) = vectype;
if (vect_print_dump_info (REPORT_DETAILS))
{
fprintf (vect_dump, "vectype: ");
print_generic_expr (vect_dump, vectype, TDF_SLIM);
}
nunits = TYPE_VECTOR_SUBPARTS (vectype);
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "nunits = %d", nunits);
if (!vectorization_factor
|| (nunits > vectorization_factor))
vectorization_factor = nunits;
}
}
for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
{
tree stmt = bsi_stmt (si);
unsigned int nunits;
stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
tree vectype;
stmt_info = vinfo_for_stmt (stmt);
if (vect_print_dump_info (REPORT_DETAILS))
{
@ -269,10 +328,11 @@ vect_analyze_operations (loop_vec_info loop_vinfo)
return false;
}
if (STMT_VINFO_RELEVANT_P (stmt_info))
if (STMT_VINFO_RELEVANT (stmt_info) == vect_used_in_loop
&& STMT_VINFO_DEF_TYPE (stmt_info) != vect_induction_def)
{
/* Most likely a reduction-like computation that is used
in the loop. */
in the loop. */
if (vect_print_dump_info (REPORT_UNVECTORIZED_LOOPS))
fprintf (vect_dump, "not vectorized: unsupported pattern.");
return false;
@ -2235,17 +2295,7 @@ vect_mark_stmts_to_be_vectorized (loop_vec_info loop_vinfo)
(case 2)
If STMT has been identified as defining a reduction variable, then
we have two cases:
(case 2.1)
The last use of STMT is the reduction-variable, which is defined
by a loop-header-phi. We don't want to mark the phi as live or
relevant (because it does not need to be vectorized, it is handled
as part of the vectorization of the reduction), so in this case we
skip the call to vect_mark_relevant.
(case 2.2)
The rest of the uses of STMT are defined in the loop body. For
the def_stmt of these uses we want to set liveness/relevance
as follows:
we want to set liveness/relevance as follows:
STMT_VINFO_LIVE_P (DEF_STMT_info) <-- false
STMT_VINFO_RELEVANT (DEF_STMT_info) <-- vect_used_by_reduction
because even though STMT is classified as live (since it defines a
@ -2297,16 +2347,6 @@ vect_mark_stmts_to_be_vectorized (loop_vec_info loop_vinfo)
bb = bb_for_stmt (def_stmt);
if (!flow_bb_inside_loop_p (loop, bb))
continue;
/* case 2.1: the reduction-use does not mark the defining-phi
as relevant. */
if (STMT_VINFO_DEF_TYPE (stmt_vinfo) == vect_reduction_def
&& TREE_CODE (def_stmt) == PHI_NODE)
continue;
if (dt == vect_induction_def && TREE_CODE (def_stmt) == PHI_NODE)
continue;
vect_mark_relevant (&worklist, def_stmt, relevant, live_p);
}
} /* while worklist */