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from bc565843ea2 AVR: Assert minimal required bit width of section_common::flags. new e8febb64141 fold fold_truth_andor field merging into ifcombine new 3eb6e1e3335 ifcombine field-merge: set upper bound for get_best_mode

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Summary of changes: gcc/c-family/c.opt | 4 - gcc/common.opt | 4 + gcc/fold-const.cc | 512 +--------- gcc/fold-const.h | 10 + gcc/gimple-fold.cc | 1164 ++++++++++++++++++++++ gcc/testsuite/gcc.dg/field-merge-1.c | 64 ++ gcc/testsuite/gcc.dg/field-merge-10.c | 36 + gcc/testsuite/gcc.dg/field-merge-11.c | 32 + gcc/testsuite/gcc.dg/field-merge-12.c | 33 + gcc/testsuite/gcc.dg/field-merge-2.c | 31 + gcc/testsuite/gcc.dg/field-merge-3.c | 36 + gcc/testsuite/gcc.dg/field-merge-4.c | 40 + gcc/testsuite/gcc.dg/field-merge-5.c | 40 + gcc/testsuite/gcc.dg/field-merge-6.c | 26 + gcc/testsuite/gcc.dg/field-merge-7.c | 23 + gcc/testsuite/gcc.dg/field-merge-8.c | 25 + gcc/testsuite/gcc.dg/field-merge-9.c | 38 + gcc/testsuite/gcc.target/aarch64/long_branch_1.c | 2 +- gcc/tree-ssa-ifcombine.cc | 14 +- 19 files changed, 1620 insertions(+), 514 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/field-merge-1.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-10.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-11.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-12.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-2.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-3.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-4.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-5.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-6.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-7.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-8.c create mode 100644 gcc/testsuite/gcc.dg/field-merge-9.c