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Summary of changes: gcc/ChangeLog | 13 + gcc/builtins.c | 14 + gcc/testsuite/ChangeLog | 12 + gcc/testsuite/c-c++-common/ubsan/object-size-9.c | 2 +- gcc/testsuite/gcc.dg/Wstringop-overflow-14.c | 49 +++ gcc/testsuite/gcc.dg/attr-nonstring-2.c | 8 +- gcc/testsuite/gcc.dg/strlenopt-70.c | 293 +++++++++++++++ gcc/testsuite/gcc.dg/strlenopt-71.c | 212 +++++++++++ gcc/testsuite/gcc.dg/strlenopt-72.c | 64 ++++ gcc/testsuite/gcc.dg/strlenopt-8.c | 8 +- gcc/tree-ssa-strlen.c | 460 ++++++++++++++++++----- 11 files changed, 1035 insertions(+), 100 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/Wstringop-overflow-14.c create mode 100644 gcc/testsuite/gcc.dg/strlenopt-70.c create mode 100644 gcc/testsuite/gcc.dg/strlenopt-71.c create mode 100644 gcc/testsuite/gcc.dg/strlenopt-72.c