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from f30695c5b57 testsuite: riscv: drop -mcpu=xt-c920 tests from gcc-15 new d0f04bc0203 i386: Drop mask subst for define_insn_and_split of extend [ [...]

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Summary of changes: gcc/config/i386/sse.md | 270 +++++++++++++++++++++++++++++-- gcc/testsuite/g++.target/i386/pr123779.C | 56 +++++++ 2 files changed, 310 insertions(+), 16 deletions(-) create mode 100644 gcc/testsuite/g++.target/i386/pr123779.C