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* [gcc/devel/autopar_devel] tree-optimization: Fix use of uninitialized variables warnings [PR94952]
@ 2020-08-22 21:21 Giuliano Belinassi
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From: Giuliano Belinassi @ 2020-08-22 21:21 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:8700d3a8360e686c8d5ee441b1fdbd7eb7e90e05
commit 8700d3a8360e686c8d5ee441b1fdbd7eb7e90e05
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date: Tue May 5 19:44:19 2020 +0200
tree-optimization: Fix use of uninitialized variables warnings [PR94952]
While bootstrapping GCC on S/390 with --enable-checking=release several
warnings about use of uninitialized variables bitpos, bitregion_start, and
bitregion_end of function pass_store_merging::process_store are raised.
According to PR94952 these seem to be false positives which are silenced by
initialising the mentioned variables.
Bootstrapped on S/390. Ok for master and releases/gcc-10 assuming that
regtest succeeds (still running but I don't see a reason why it
should fail)?
gcc/ChangeLog:
2020-05-18 Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
PR tree-optimization/94952
* gimple-ssa-store-merging.c (pass_store_merging::process_store):
Initialize variables bitpos, bitregion_start, and bitregion_end in
order to silence warnings about use of uninitialized variables.
Diff:
---
gcc/ChangeLog | 7 +++++++
gcc/gimple-ssa-store-merging.c | 4 ++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 51b5b6c908d..0a1ff053ffa 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2020-05-18 Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
+
+ PR tree-optimization/94952
+ * gimple-ssa-store-merging.c (pass_store_merging::process_store):
+ Initialize variables bitpos, bitregion_start, and bitregion_end in
+ order to silence warnings about use of uninitialized variables.
+
2020-05-18 Carl Love <cel@us.ibm.com>
PR target/94833
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 25753517cc6..c8e1877f540 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -4668,8 +4668,8 @@ pass_store_merging::process_store (gimple *stmt)
{
tree lhs = gimple_assign_lhs (stmt);
tree rhs = gimple_assign_rhs1 (stmt);
- poly_uint64 bitsize, bitpos;
- poly_uint64 bitregion_start, bitregion_end;
+ poly_uint64 bitsize, bitpos = 0;
+ poly_uint64 bitregion_start = 0, bitregion_end = 0;
tree base_addr
= mem_valid_for_store_merging (lhs, &bitsize, &bitpos,
&bitregion_start, &bitregion_end);
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2020-08-22 21:21 [gcc/devel/autopar_devel] tree-optimization: Fix use of uninitialized variables warnings [PR94952] Giuliano Belinassi
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