[Bug sanitizer/55309] gcc's address-sanitizer 66% slower than clang's

[kcc at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309



--- Comment #17 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-02-06 
11:18:28 UTC ---

Trying this patch: 

% cat inc.cc

void foo(int *a) {

  (*a)++;

}

% gcc -fsanitize=address -O2 inc.cc -S -o - | grep __asan_report

        call    __asan_report_load4

        call    __asan_report_store4

% clang -fsanitize=address -O2 inc.cc -S -o - | grep __asan_report 

        callq   __asan_report_load4

% 



Is this test expected to work (have one __asan_error call) with this patch?



(I've checked that the patch is applied correctly, on 

gcc/testsuite/c-c++-common/asan/no-redundant-instrumentation-1.c 

it reduces the number of calls from 16 to 5)