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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.
This commit is contained in:
Stefan Schulze Frielinghaus 2020-05-05 19:44:19 +02:00
parent be464161b4
commit 2c832ffedf
2 changed files with 9 additions and 2 deletions
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7
gcc/ChangeLog
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@ -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

4
gcc/gimple-ssa-store-merging.c
View File

@ -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);