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from b6ca11407d4 i386: Add peephole2 patterns to improve add with carry or s [...] new ec52d228d6d i386: Add peephole2 patterns to improve subtract with borro [...] new 43a3252c42a middle-end, i386: Pattern recognize add/subtract with carry [...]

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Summary of changes: gcc/config/i386/i386.md | 227 ++++++++++++- gcc/doc/md.texi | 16 + gcc/fold-const-call.cc | 24 ++ gcc/gimple-fold.cc | 29 ++ gcc/gimple-range-fold.cc | 2 + gcc/internal-fn.cc | 39 +++ gcc/internal-fn.def | 2 + gcc/optabs.def | 2 + gcc/testsuite/gcc.target/i386/pr79173-1.c | 59 ++++ gcc/testsuite/gcc.target/i386/pr79173-10.c | 31 ++ gcc/testsuite/gcc.target/i386/pr79173-2.c | 59 ++++ gcc/testsuite/gcc.target/i386/pr79173-3.c | 61 ++++ gcc/testsuite/gcc.target/i386/pr79173-4.c | 61 ++++ gcc/testsuite/gcc.target/i386/pr79173-5.c | 32 ++ gcc/testsuite/gcc.target/i386/pr79173-6.c | 33 ++ gcc/testsuite/gcc.target/i386/pr79173-7.c | 31 ++ gcc/testsuite/gcc.target/i386/pr79173-8.c | 31 ++ gcc/testsuite/gcc.target/i386/pr79173-9.c | 31 ++ gcc/tree-ssa-dce.cc | 8 + gcc/tree-ssa-math-opts.cc | 500 ++++++++++++++++++++++++++++- 20 files changed, 1269 insertions(+), 9 deletions(-) create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-1.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-10.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-2.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-3.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-4.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-5.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-6.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-7.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-8.c create mode 100644 gcc/testsuite/gcc.target/i386/pr79173-9.c