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tree-optimization/109139 - fix .DEFERRED_INIT removal

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The following make sure to strip MEMs when looking for unused
decls on the LHS of .DEFERRED_INIT.

	PR tree-optimization/109139
	* tree-ssa-live.cc (remove_unused_locals): Look at the
	base address for unused decls on the LHS of .DEFERRED_INIT.

	* gcc.dg/torture/pr109139.c: New testcase.
This commit is contained in:
Richard Biener
2023-03-15 09:47:18 +01:00
parent 45641f3a99
commit 0fc541efc3
2 changed files with 14 additions and 1 deletions
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gcc/testsuite/gcc.dg/torture/pr109139.c
+12
View File
@@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-additional-options "-ftrivial-auto-var-init=zero" } */
const int COMPARE_CANDIDATE;
char ipmi_ek_compare_link_record1_0, ipmi_ek_compare_link_record2_0;
void ipmi_ek_compare_link()
{
for (; ipmi_ek_compare_link_record1_0;)
for (; ipmi_ek_compare_link_record2_0;) {
int link[COMPARE_CANDIDATE];
}
}
gcc/tree-ssa-live.cc
+2 -1
View File
@@ -897,7 +897,8 @@ remove_unused_locals (void)
else if (gimple_call_internal_p (stmt, IFN_DEFERRED_INIT))
{
tree lhs = gimple_call_lhs (stmt);
if (DECL_P (lhs) && !is_used_p (lhs))
tree base = get_base_address (lhs);
if (DECL_P (base) && !is_used_p (base))
{
unlink_stmt_vdef (stmt);
gsi_remove (&gsi, true);