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| author | Jan Hubicka <jh@suse.cz> | 2021-11-19 18:09:13 +0100 |
|---|---|---|
| committer | Jan Hubicka <jh@suse.cz> | 2021-11-19 18:09:13 +0100 |
| commit | ada63d56beb0e535d35b165b55f85e29a0b36929 (patch) | |
| tree | b809bfa4f6a962e625f2c437130a2eb60e0ba7d4 /gcc/tree-ssa-alias.c | |
| parent | 16137fbb9256ef365dd498d39024eb33de1a4cd8 (diff) | |
| download | gcc-ada63d56beb0e535d35b165b55f85e29a0b36929.zip gcc-ada63d56beb0e535d35b165b55f85e29a0b36929.tar.gz gcc-ada63d56beb0e535d35b165b55f85e29a0b36929.tar.bz2 | |
Use modref even for nested functions in ref_maybe_used_by_call_p_1
Remove test for function not having call chain guarding modref use in
ref_maybe_used_by_call_p_1. It never made sense since modref treats call chain
accesses explicitly. It was however copied from earlier check for ECF_CONST
(which seems dubious too, but I would like to discuss it independelty).
This enables us to detect that memory pointed to static chain (or parts of it)
are unused by the function.
lto-bootstrapped-regtested all lanugages on x86_64-linux.
gcc/ChangeLog:
2021-11-19 Jan Hubicka <hubicka@ucw.cz>
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Do not guard modref
by !gimple_call_chain.
gcc/testsuite/ChangeLog:
2021-11-19 Jan Hubicka <hubicka@ucw.cz>
* gcc.dg/tree-ssa/modref-dse-6.c: New test.
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 02bbc87..cd6a0b2 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2755,7 +2755,7 @@ ref_maybe_used_by_call_p_1 (gcall *call, ao_ref *ref, bool tbaa_p) callee = gimple_call_fndecl (call); - if (!gimple_call_chain (call) && callee != NULL_TREE) + if (callee != NULL_TREE) { struct cgraph_node *node = cgraph_node::get (callee); /* We can not safely optimize based on summary of calle if it does |