On Fri, Aug 27, 2010 at 8:24 PM, Hongtao <yu...@purdue.edu> wrote: > On 08/27/10 12:35, Richard Guenther wrote: >> On Fri, Aug 27, 2010 at 5:27 PM, Hongtao <yu...@purdue.edu> wrote: >> >>> Hi all, >>> >>> I have instrumented a function call like foo(&a,&b) into the gimple SSA >>> representation (gcc-4.5) and the consequent optimizations can not pass >>> my instrumented code. The back traces are as followings. The error >>> occurred when the pass dse tried to test if the call I inserted may use >>> a memory reference. It is because the arguments &a is not a SSA_VAR or >>> INDIRECT_REF, so the assert in function >>> >>> bool >>> refs_may_alias_p_1 (ao_ref *ref1, ao_ref *ref2, bool tbaa_p) >>> >>> gcc_assert ((!ref1->ref >>> || SSA_VAR_P (ref1->ref) >>> || handled_component_p (ref1->ref) >>> || INDIRECT_REF_P (ref1->ref) >>> || TREE_CODE (ref1->ref) == TARGET_MEM_REF >>> || TREE_CODE (ref1->ref) == CONST_DECL) >>> && (!ref2->ref >>> || SSA_VAR_P (ref2->ref) >>> || handled_component_p (ref2->ref) >>> || INDIRECT_REF_P (ref2->ref) >>> || TREE_CODE (ref2->ref) == TARGET_MEM_REF >>> || TREE_CODE (ref2->ref) == CONST_DECL)); >>> was violated. >>> >>> Does anyone know why the function arguments must be a SSA_VAR or >>> INDIRECT_REF here? Have I missed to perform any actions to maintain the >>> consistency of Gimple SSA? >>> >> Yes. is_gimple_val () will return false for your arguments as it seems that >> the variables do not have function invariant addresses. >> >> Richard. >> >> > Thanks. But how can I change my argument to gimple_vals, using it with > an assignment to a temp before and replacing my argument with the temp?
Yes, that will work. Richard. > Hongtao >>> #0 0x00007ffff6fc8ee0 in exit () from /lib/libc.so.6 >>> #1 0x00000000005ae4ce in diagnostic_action_after_output >>> (context=0x1323880, diagnostic=0x7fffffffd870) at >>> ../../src/gcc/diagnostic.c:198 >>> #2 0x00000000005aed54 in diagnostic_report_diagnostic >>> (context=0x1323880, diagnostic=0x7fffffffd870) at >>> ../../src/gcc/diagnostic.c:424 >>> #3 0x00000000005afdc3 in internal_error (gmsgid=0xddfb57 "in %s, at >>> %s:%d") at ../../src/gcc/diagnostic.c:709 >>> #4 0x00000000005aff4f in fancy_abort (file=0xe42670 >>> "../../src/gcc/tree-ssa-alias.c", line=786, function=0xe427e0 >>> "refs_may_alias_p_1") >>> at ../../src/gcc/diagnostic.c:763 >>> #5 0x00000000008a1adb in refs_may_alias_p_1 (ref1=0x7fffffffdab0, >>> ref2=0x7fffffffdb50, tbaa_p=1 '\001') >>> at ../../src/gcc/tree-ssa-alias.c:775 >>> #6 0x00000000008a2b12 in ref_maybe_used_by_call_p_1 >>> (call=0x7ffff6790630, ref=0x7fffffffdb50) at >>> ../../src/gcc/tree-ssa-alias.c:1133 >>> #7 0x00000000008a2d2e in ref_maybe_used_by_call_p (call=0x7ffff6790630, >>> ref=0x7ffff6848048) at ../../src/gcc/tree-ssa-alias.c:1147 >>> #8 0x00000000008a2dfa in ref_maybe_used_by_stmt_p (stmt=0x7ffff6790630, >>> ref=0x7ffff6848048) at ../../src/gcc/tree-ssa-alias.c:1179 >>> #9 0x00000000008bf275 in dse_possible_dead_store_p >>> (stmt=0x7ffff683e820, use_stmt=0x7fffffffdca8) at >>> ../../src/gcc/tree-ssa-dse.c:212 >>> #10 0x00000000008bfeb9 in dse_optimize_stmt (dse_gd=0x7fffffffddd0, >>> bd=0x156bd30, gsi=...) at ../../src/gcc/tree-ssa-dse.c:297 >>> #11 0x00000000008c029d in dse_enter_block (walk_data=0x7fffffffdde0, >>> bb=0x7ffff6a75068) at ../../src/gcc/tree-ssa-dse.c:370 >>> #12 0x0000000000cc26a5 in walk_dominator_tree (walk_data=0x7fffffffdde0, >>> bb=0x7ffff6a75068) at ../../src/gcc/domwalk.c:185 >>> #13 0x00000000008c0812 in tree_ssa_dse () at >>> ../../src/gcc/tree-ssa-dse.c:430 >>> #14 0x000000000073af0a in execute_one_pass (pass=0x13cced0) at >>> ../../src/gcc/passes.c:1572 >>> #15 0x000000000073b21a in execute_pass_list (pass=0x13cced0) at >>> ../../src/gcc/passes.c:1627 >>> #16 0x000000000073b238 in execute_pass_list (pass=0x1312720) at >>> ../../src/gcc/passes.c:1628 >>> #17 0x000000000086e372 in tree_rest_of_compilation >>> (fndecl=0x7ffff6b93500) at ../../src/gcc/tree-optimize.c:413 >>> #18 0x00000000009fa7c5 in cgraph_expand_function (node=0x7ffff6be7000) >>> at ../../src/gcc/cgraphunit.c:1548 >>> #19 0x00000000009faa49 in cgraph_expand_all_functions () at >>> ../../src/gcc/cgraphunit.c:1627 >>> #20 0x00000000009fb07e in cgraph_optimize () at >>> ../../src/gcc/cgraphunit.c:1875 >>> #21 0x00000000009f9461 in cgraph_finalize_compilation_unit () at >>> ../../src/gcc/cgraphunit.c:1096 >>> #22 0x00000000004a9e93 in c_write_global_declarations () at >>> ../../src/gcc/c-decl.c:9519 >>> #23 0x00000000008180d4 in compile_file () at ../../src/gcc/toplev.c:1065 >>> #24 0x000000000081a1c5 in do_compile () at ../../src/gcc/toplev.c:2417 >>> #25 0x000000000081a286 in toplev_main (argc=21, argv=0x7fffffffe0f8) at >>> ../../src/gcc/toplev.c:2459 >>> #26 0x0000000000519c6b in main (argc=21, argv=0x7fffffffe0f8) at >>> ../../src/gcc/main.c:35 >>> >>> Thanks, >>> >>> Hongtao >>> Purdue University >>> >>> >>> >>> >> > >
