RISC-V: Add testcases for scalar unsigned SAT_SUB form 8

After the middle-end support the form 8 of unsigned SAT_SUB and
the RISC-V backend implement the scalar .SAT_SUB, add more test
case to cover the form 8 of unsigned .SAT_SUB.

Form 8:
  #define SAT_SUB_U_8(T) \
  T sat_sub_u_8_##T (T x, T y) \
  { \
    T ret; \
    T overflow = __builtin_sub_overflow (x, y, &ret); \
    return ret & (T)-(!overflow); \
  }

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-29.c: New test.
	* gcc.target/riscv/sat_u_sub-30.c: New test.
	* gcc.target/riscv/sat_u_sub-31.c: New test.
	* gcc.target/riscv/sat_u_sub-32.c: New test.
	* gcc.target/riscv/sat_u_sub-run-29.c: New test.
	* gcc.target/riscv/sat_u_sub-run-30.c: New test.
	* gcc.target/riscv/sat_u_sub-run-31.c: New test.
	* gcc.target/riscv/sat_u_sub-run-32.c: New test.

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

0 files changed, 0 insertions, 0 deletions