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* [gcc r12-5615] Remove can_throw_non_call_exceptions special case from operator_div::wi_fold.
@ 2021-11-30 10:23 Aldy Hernandez
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From: Aldy Hernandez @ 2021-11-30 10:23 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f33fdda0b805ff6097f9f325d73a4b07e72170b0
commit r12-5615-gf33fdda0b805ff6097f9f325d73a4b07e72170b0
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Mon Nov 29 12:52:45 2021 +0100
Remove can_throw_non_call_exceptions special case from operator_div::wi_fold.
PR tree-optimization/103451
gcc/ChangeLog:
* range-op.cc (operator_div::wi_fold): Remove
can_throw_non_call_exceptions special case.
* tree-ssa-sink.c (sink_code_in_bb): Same.
gcc/testsuite/ChangeLog:
* gcc.dg/pr103451.c: New test.
Diff:
---
gcc/range-op.cc | 7 -------
gcc/testsuite/gcc.dg/pr103451.c | 19 +++++++++++++++++++
gcc/tree-ssa-sink.c | 4 +++-
3 files changed, 22 insertions(+), 8 deletions(-)
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index bbf2924f815..6fe5f1cb4e0 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -1832,13 +1832,6 @@ operator_div::wi_fold (irange &r, tree type,
return;
}
- // If flag_non_call_exceptions, we must not eliminate a division by zero.
- if (cfun->can_throw_non_call_exceptions)
- {
- r.set_varying (type);
- return;
- }
-
// If we're definitely dividing by zero, there's nothing to do.
if (wi_zero_p (type, divisor_min, divisor_max))
{
diff --git a/gcc/testsuite/gcc.dg/pr103451.c b/gcc/testsuite/gcc.dg/pr103451.c
new file mode 100644
index 00000000000..c701934603e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr103451.c
@@ -0,0 +1,19 @@
+// { dg-do compile }
+// { dg-options "-O2 -w -fnon-call-exceptions -fno-delete-dead-exceptions -fdump-tree-optimized" }
+
+int func_10_ptr_12;
+
+void func_10(long li_8)
+{
+ long *ptr_9 = &li_8;
+ li_8 &= *ptr_9 / 0 ?: li_8;
+ for (;;)
+ func_10_ptr_12 &= 4 ? *ptr_9 : 4;
+}
+
+void func_9_s_8()
+{
+ func_10(func_9_s_8);
+}
+
+// { dg-final { scan-tree-dump " / 0" "optimized" } }
diff --git a/gcc/tree-ssa-sink.c b/gcc/tree-ssa-sink.c
index 92f444ec1c8..c5d67840be3 100644
--- a/gcc/tree-ssa-sink.c
+++ b/gcc/tree-ssa-sink.c
@@ -696,7 +696,9 @@ sink_code_in_bb (basic_block bb)
/* If we face a dead stmt remove it as it possibly blocks
sinking of uses. */
if (zero_uses_p
- && ! gimple_vdef (stmt))
+ && !gimple_vdef (stmt)
+ && (cfun->can_delete_dead_exceptions
+ || !stmt_could_throw_p (cfun, stmt)))
{
gsi_remove (&saved, true);
release_defs (stmt);
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