89 lines
2.5 KiB
Diff
89 lines
2.5 KiB
Diff
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Source: 2019-06-21 Jeff Law <law@redhat.com>
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Upstream: yes
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Reason: PR tree-optimization/90949
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* tree-ssa-copy.c (fini_copy_prop): Use reset_flow_sensitive_info.
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* tree-ssanames.c (reset_flow_sensitive_info): Reset non-null state.
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--- gcc/tree-ssa-copy.c 2019-01-01 13:31:55.000000000 +0100
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+++ gcc/tree-ssa-copy.c 2019-06-26 18:50:01.030395471 +0200
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@@ -545,13 +545,12 @@
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duplicate_ssa_name_ptr_info (copy_of[i].value,
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SSA_NAME_PTR_INFO (var));
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/* Points-to information is cfg insensitive,
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- but alignment info might be cfg sensitive, if it
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- e.g. is derived from VRP derived non-zero bits.
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- So, do not copy alignment info if the two SSA_NAMEs
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- aren't defined in the same basic block. */
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+ but [E]VRP might record context sensitive alignment
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+ info, non-nullness, etc. So reset context sensitive
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+ info if the two SSA_NAMEs aren't defined in the same
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+ basic block. */
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if (var_bb != copy_of_bb)
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- mark_ptr_info_alignment_unknown
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- (SSA_NAME_PTR_INFO (copy_of[i].value));
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+ reset_flow_sensitive_info (copy_of[i].value);
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}
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else if (!POINTER_TYPE_P (TREE_TYPE (var))
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&& SSA_NAME_RANGE_INFO (var)
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--- gcc/tree-ssanames.c 2019-03-18 14:59:11.000000000 +0100
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+++ gcc/tree-ssanames.c 2019-06-26 18:50:11.282394906 +0200
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@@ -820,7 +820,12 @@
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{
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/* points-to info is not flow-sensitive. */
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if (SSA_NAME_PTR_INFO (name))
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- mark_ptr_info_alignment_unknown (SSA_NAME_PTR_INFO (name));
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+ {
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+ /* [E]VRP can derive context sensitive alignment info and
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+ non-nullness properties. We must reset both. */
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+ mark_ptr_info_alignment_unknown (SSA_NAME_PTR_INFO (name));
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+ SSA_NAME_PTR_INFO (name)->pt.null = 1;
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+ }
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}
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else
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SSA_NAME_RANGE_INFO (name) = NULL;
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--- /dev/null
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+++ gcc/testsuite/gcc.c-torture/pr90949.c 2019-06-26 18:53:16.870384679 +0200
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@@ -0,0 +1,42 @@
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+void __attribute__ ((noipa, noinline)) my_puts (const char *str) { }
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+
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+void __attribute__ ((noipa, noinline)) my_free (void *p) { }
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+
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+
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+struct Node
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+{
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+ struct Node *child;
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+};
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+
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+struct Node space[2] = { };
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+
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+struct Node * __attribute__ ((noipa, noinline)) my_malloc (int bytes)
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+{
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+ return &space[0];
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+}
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+
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+void
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+walk (struct Node *module, int cleanup)
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+{
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+ if (module == 0)
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+ {
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+ return;
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+ }
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+ if (!cleanup)
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+ {
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+ my_puts ("No cleanup");
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+ }
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+ walk (module->child, cleanup);
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+ if (cleanup)
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+ {
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+ my_free (module);
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+ }
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+}
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+
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+int
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+main ()
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+{
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+ struct Node *node = my_malloc (sizeof (struct Node));
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+ node->child = 0;
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+ walk (node, 1);
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+}
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