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* [gcc r12-8549] Don't use gori depedencies to optimize.
@ 2022-07-04 17:22 Andrew Macleod
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From: Andrew Macleod @ 2022-07-04 17:22 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d4738cbb02e201c031a2a44d8bc10d3e17d987dc
commit r12-8549-gd4738cbb02e201c031a2a44d8bc10d3e17d987dc
Author: Andrew MacLeod <amacleod@redhat.com>
Date: Mon Jul 4 11:21:34 2022 -0400
Don't use gori depedencies to optimize.
The routine fold_using_range::relation_fold_and_or needs to verify that both
operands of 2 stmts are the same, and uses GORIs dependency cache for this.
This cache cannot be counted on to reflect the current contents of a
stmt, expecially in the presence of an IL changing pass. Instead, look at the
statement operands.
PR tree-optimization/106114
gcc/
* gimple-range-fold.cc (fold_using_range::relation_fold_and_or): Check
statement operands instead of GORI cache.
gcc/testsuite/
* gcc.dg/pr106114.c: New.
Diff:
---
gcc/gimple-range-fold.cc | 30 +++++++++++++++++-------------
gcc/testsuite/gcc.dg/pr106114.c | 14 ++++++++++++++
2 files changed, 31 insertions(+), 13 deletions(-)
diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index dfacf6f14dc..7f03911e1c9 100644
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -1374,14 +1374,25 @@ fold_using_range::relation_fold_and_or (irange& lhs_range, gimple *s,
// Ideally we search dependencies for common names, and see what pops out.
// until then, simply try to resolve direct dependencies.
- // Both names will need to have 2 direct dependencies.
- tree ssa1_dep2 = src.gori ()->depend2 (ssa1);
- tree ssa2_dep2 = src.gori ()->depend2 (ssa2);
- if (!ssa1_dep2 || !ssa2_dep2)
+ gimple *ssa1_stmt = SSA_NAME_DEF_STMT (ssa1);
+ gimple *ssa2_stmt = SSA_NAME_DEF_STMT (ssa2);
+
+ range_operator *handler1 = gimple_range_handler (SSA_NAME_DEF_STMT (ssa1));
+ range_operator *handler2 = gimple_range_handler (SSA_NAME_DEF_STMT (ssa2));
+
+ // If either handler is not present, no relation can be found.
+ if (!handler1 || !handler2)
+ return;
+
+ // Both stmts will need to have 2 ssa names in the stmt.
+ tree ssa1_dep1 = gimple_range_ssa_p (gimple_range_operand1 (ssa1_stmt));
+ tree ssa1_dep2 = gimple_range_ssa_p (gimple_range_operand2 (ssa1_stmt));
+ tree ssa2_dep1 = gimple_range_ssa_p (gimple_range_operand1 (ssa2_stmt));
+ tree ssa2_dep2 = gimple_range_ssa_p (gimple_range_operand2 (ssa2_stmt));
+
+ if (!ssa1_dep1 || !ssa1_dep2 || !ssa2_dep1 || !ssa2_dep2)
return;
- tree ssa1_dep1 = src.gori ()->depend1 (ssa1);
- tree ssa2_dep1 = src.gori ()->depend1 (ssa2);
// Make sure they are the same dependencies, and detect the order of the
// relationship.
bool reverse_op2 = true;
@@ -1390,13 +1401,6 @@ fold_using_range::relation_fold_and_or (irange& lhs_range, gimple *s,
else if (ssa1_dep1 != ssa2_dep2 || ssa1_dep2 != ssa2_dep1)
return;
- range_operator *handler1 = gimple_range_handler (SSA_NAME_DEF_STMT (ssa1));
- range_operator *handler2 = gimple_range_handler (SSA_NAME_DEF_STMT (ssa2));
-
- // If either handler is not present, no relation is found.
- if (!handler1 || !handler2)
- return;
-
int_range<2> bool_one (boolean_true_node, boolean_true_node);
relation_kind relation1 = handler1->op1_op2_relation (bool_one);
diff --git a/gcc/testsuite/gcc.dg/pr106114.c b/gcc/testsuite/gcc.dg/pr106114.c
new file mode 100644
index 00000000000..64c8b8d390a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr106114.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-dom2" } */
+
+int printf(const char *, ...);
+char a = 139, b;
+int main() {
+ char c = 173;
+ b = a;
+ while (c <= a || a < -117)
+ c = printf("0\n");
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if" 2 "dom2" } } */
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