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rtl-optimization/105091 - wrong DSE with missed TREE_ADDRESSABLE 

When expanding an aggregate copy into a memcpy call RTL expansion
uses mark_addressable to ensure the base object is addressable but
that function doesn't handle TARGET_MEM_REF bases.  Fixed as follows.

2022-03-31  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/105091
	* gimple-expr.cc (mark_addressable): Handle TARGET_MEM_REF
	bases.
This commit is contained in:
Richard Biener 2022-03-31 08:20:43 +02:00
parent b8207ad367
commit b75f996e84
1 changed files with 2 additions and 1 deletions
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3
gcc/gimple-expr.cc
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@ -910,7 +910,8 @@ mark_addressable (tree x)
x = TREE_OPERAND (x, 0);
while (handled_component_p (x))
x = TREE_OPERAND (x, 0);
if (TREE_CODE (x) == MEM_REF
if ((TREE_CODE (x) == MEM_REF
|| TREE_CODE (x) == TARGET_MEM_REF)
&& TREE_CODE (TREE_OPERAND (x, 0)) == ADDR_EXPR)
x = TREE_OPERAND (TREE_OPERAND (x, 0), 0);
if (!VAR_P (x)