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while working on -fmalloc-dce I noticed that tree-ssa-dce.cc still has an outdated list of builtions that are known to not read memory that can be replaced by query to fnspec and modref. If I get things right, dce does some dead store removal, but only on those memory object that are non-aliased (automatic variabels with no address taken) and for all other memory addresses it resorts to mark_all_reaching_defs_necessary expecting DSE to do the rest. So we really want to only check if there are no memory reads at all rather then trying to understand them by parsing fnspec or modref summary. I did run testsuite ensuring that all builtins matched previously are still matched. There are few testcases where this check fails, due to type incompatibility. New code uses gimple_call_builtin while other just checked callee_decl. We test things like calling free() without parmeter which I don't think we want to care about, but there is also testase declaring void * calloc (long, long) where builtin declaration expects unsigned long. I am not sure if this case should not be allowed by gimple_call_builtin? Bootstrappe/regtested x86_64-linux. OK? gcc/ChangeLog: * ipa-modref.cc (ipa_modref_callee_reads_no_memory_p): New function. * ipa-modref.h (ipa_modref_callee_reads_no_memory_p): Declare * tree-ssa-dce.cc (propagate_necessity): Use it. |
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