RISC-V: Add testcases for scalar unsigned SAT_SUB form 9

After the middle-end support the form 9 of unsigned SAT_SUB and
the RISC-V backend implement the scalar .SAT_SUB, add more test
case to cover the form 9 of unsigned .SAT_SUB.

Form 9:
  #define SAT_SUB_U_9(T) \
  T sat_sub_u_9_##T (T x, T y) \
  { \
    T ret; \
    T overflow = __builtin_sub_overflow (x, y, &ret); \
    return overflow ? 0 : ret; \
  }

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-33.c: New test.
	* gcc.target/riscv/sat_u_sub-34.c: New test.
	* gcc.target/riscv/sat_u_sub-35.c: New test.
	* gcc.target/riscv/sat_u_sub-36.c: New test.
	* gcc.target/riscv/sat_u_sub-run-33.c: New test.
	* gcc.target/riscv/sat_u_sub-run-34.c: New test.
	* gcc.target/riscv/sat_u_sub-run-35.c: New test.
	* gcc.target/riscv/sat_u_sub-run-36.c: New test.

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

0 files changed, 0 insertions, 0 deletions