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When the input of the scalar unsigned SAT_TRUNC is not Xmode, the rtx need to zero extend to Xmode before the underlying code gen. Most of other SAT_* code gen has leveraged the API riscv_extend_to_xmode_reg but still have the ustrunc missed. Then results in the failures mentioned in PR. The below test suites are passed for this patch series. * The rv64gcv fully regression test. PR target/122692 gcc/ChangeLog: * config/riscv/riscv.cc (riscv_expand_ustrunc): Leverage riscv_extend_to_xmode_reg to take care of src rtx. gcc/testsuite/ChangeLog: * g++.target/riscv/pr122692-run-1.C: New test. * g++.target/riscv/pr122692-run-2.C: New test. Signed-off-by: Pan Li <pan2.li@intel.com>
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