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Diffstat (limited to 'gcc/ipa-modref.c')
| -rw-r--r-- | gcc/ipa-modref.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c index fafd804..5491538 100644 --- a/gcc/ipa-modref.c +++ b/gcc/ipa-modref.c @@ -1700,6 +1700,15 @@ analyze_ssa_name_flags (tree name, vec<modref_lattice> &lattice, int depth, else if (gcall *call = dyn_cast <gcall *> (use_stmt)) { tree callee = gimple_call_fndecl (call); + + /* IPA PTA internally it treats calling a function as "writing" to + the argument space of all functions the function pointer points to + (PR101949). We can not drop EAF_NOCLOBBER only when ipa-pta + is on since that would allow propagation of this from -fno-ipa-pta + to -fipa-pta functions. */ + if (gimple_call_fn (use_stmt) == name) + lattice[index].merge (~EAF_NOCLOBBER); + /* Return slot optimization would require bit of propagation; give up for now. */ if (gimple_call_return_slot_opt_p (call) |