RISC-V: Add testcases for scalar unsigned SAT_SUB form 5

After the middle-end support the form 5 of unsigned SAT_SUB and
the RISC-V backend implement the scalar .SAT_SUB, add more test
case to cover the form 5 of unsigned .SAT_SUB.

Form 5:
  #define SAT_SUB_U_5(T) \
  T sat_sub_u_5_##T (T x, T y) \
  { \
    return x < y ? 0 : x - y; \
  }

Passed the rv64gcv fully regression test.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/sat_arith.h: Add helper macro for test.
	* gcc.target/riscv/sat_u_sub-17.c: New test.
	* gcc.target/riscv/sat_u_sub-18.c: New test.
	* gcc.target/riscv/sat_u_sub-19.c: New test.
	* gcc.target/riscv/sat_u_sub-20.c: New test.
	* gcc.target/riscv/sat_u_sub-run-17.c: New test.
	* gcc.target/riscv/sat_u_sub-run-18.c: New test.
	* gcc.target/riscv/sat_u_sub-run-19.c: New test.
	* gcc.target/riscv/sat_u_sub-run-20.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>

0 files changed, 0 insertions, 0 deletions