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Add unsigned type iv_cand for iv_use with non mode-precision type

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Precisely,  for iv_use if it's not integer/pointer type, or non-mode
precision type, add candidate for the corresponding scev in unsigned
type with the same precision, rather than its original type.

Backport from master.
2020-04-09  Bin Cheng  <bin.cheng@linux.alibaba.com>
    PR tree-optimization/93674

gcc/
    * tree-ssa-loop-ivopts.c (langhooks.h): New include.
    (add_iv_candidate_for_use): For iv_use of non integer or pointer type,
    or non-mode precision type, add candidate in unsigned type with the
    same precision.

gcc/testsuite/
    * g++.dg/pr93674.C: New test.
This commit is contained in:
Bin Cheng
2020-05-04 14:28:54 +08:00
parent 6f48762bb4
commit 28d68fde77
4 changed files with 52 additions and 1 deletions
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11
gcc/ChangeLog
View File

@@ -1,3 +1,14 @@
2020-05-04 Bin Cheng <bin.cheng@linux.alibaba.com>
PR tree-optimization/93674
Backport from master
2020-04-09 Bin Cheng <bin.cheng@linux.alibaba.com>
* tree-ssa-loop-ivopts.c (langhooks.h): New include.
(add_iv_candidate_for_use): For iv_use of non integer or pointer type,
or non-mode precision type, add candidate in unsigned type with the
same precision.
2020-05-01 Alan Modra <amodra@gmail.com>
PR target/94145

8
gcc/testsuite/ChangeLog
View File

@@ -1,3 +1,11 @@
2020-05-04 Bin Cheng <bin.cheng@linux.alibaba.com>
PR tree-optimization/93674
Backport from master
2020-04-09 Bin Cheng <bin.cheng@linux.alibaba.com>
* g++.dg/pr93674.C: New test.
2020-05-01 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/93956

16
gcc/testsuite/g++.dg/pr93674.C Normal file
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@@ -0,0 +1,16 @@
// { dg-do compile }
// { dg-options "-O3 -std=c++14 -fstrict-enums -pedantic -fdump-tree-optimized" }
enum some_enum { x = 1000 };
void sink(some_enum);
int __attribute__((noinline)) func() {
int sum = 0;
for (int i = 0; i < 3; ++i) {
for (int j = 3; j >= 0; --j) {
sink((some_enum)(i + j));
}
}
return sum;
}
// { dg-final { scan-tree-dump-not "some_enum ivtmp" "optimized" } }

18
gcc/tree-ssa-loop-ivopts.c
View File

@@ -109,6 +109,9 @@ along with GCC; see the file COPYING3. If not see
#include "builtins.h"
#include "tree-vectorizer.h"
/* For lang_hooks.types.type_for_mode. */
#include "langhooks.h"
/* FIXME: Expressions are expanded to RTL in this pass to determine the
cost of different addressing modes. This should be moved to a TBD
interface between the GIMPLE and RTL worlds. */
@@ -3490,8 +3493,21 @@ add_iv_candidate_for_use (struct ivopts_data *data, struct iv_use *use)
{
poly_uint64 offset;
tree base;
tree basetype;
struct iv *iv = use->iv;
tree basetype = TREE_TYPE (iv->base);
/* Don't add candidate for iv_use with non integer, pointer or non-mode
precision types, instead, add candidate for the corresponding scev in
unsigned type with the same precision. See PR93674 for more info. */
if ((TREE_CODE (basetype) != INTEGER_TYPE && !POINTER_TYPE_P (basetype))
|| !type_has_mode_precision_p (basetype))
{
basetype = lang_hooks.types.type_for_mode (TYPE_MODE (basetype),
TYPE_UNSIGNED (basetype));
add_candidate (data, fold_convert (basetype, iv->base),
fold_convert (basetype, iv->step), false, NULL);
return;
}
add_candidate (data, iv->base, iv->step, false, use);