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tree-optimization/120156 - ICE in ptr_derefs_may_alias_p 

This picks the ptr_derefs_may_alias_p fix from the PR99954 fix
which said:  This makes us run into a latent issue in
ptr_deref_may_alias_decl_p when the pointer is something like &MEM[0].a
in which case we fail to handle non-SSA name pointers.  Add code
similar to what we have in ptr_derefs_may_alias_p.

	PR tree-optimization/120156
	* tree-ssa-alias.cc (ptr_deref_may_alias_decl_p): Verify
	the pointer is an SSA name.

(cherry picked from commit c290e6a0b7)
This commit is contained in:
Richard Biener 2024-05-14 11:13:51 +02:00
parent 79dae83f62
commit 50d3f67c71
1 changed files with 5 additions and 0 deletions
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5
gcc/tree-ssa-alias.cc
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@ -295,6 +295,11 @@ ptr_deref_may_alias_decl_p (tree ptr, tree decl)
if (!may_be_aliased (decl))
return false;
/* From here we require a SSA name pointer. Anything else aliases. */
if (TREE_CODE (ptr) != SSA_NAME
|| !POINTER_TYPE_P (TREE_TYPE (ptr)))
return true;
/* If we do not have useful points-to information for this pointer
we cannot disambiguate anything else. */
pi = SSA_NAME_PTR_INFO (ptr);