[PATCH 4/6] powerpc test_emulate_step: add negative tests for prefixed addi

[Balamuruhan S <bala24@linux.ibm.com>]

testcases for `paddi` instruction to cover the negative case,
if R is equal to 1 and RA is not equal to 0, the instruction
form is invalid.

Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
---
 arch/powerpc/lib/test_emulate_step.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c
index 79acc899a618..f9825c275c31 100644
--- a/arch/powerpc/lib/test_emulate_step.c
+++ b/arch/powerpc/lib/test_emulate_step.c
@@ -1197,6 +1197,16 @@ static struct compute_test compute_tests[] = {
 				.regs = {
 					.gpr[21] = 0,
 				}
+			},
+			/* Invalid instruction form with R = 1 and RA != 0 */
+			{
+				.descr = "RA = R22(0), SI = 0, R = 1",
+				.instr = TEST_PADDI(21, 22, 0, 1),
+				.negative = true,
+				.regs = {
+					.gpr[21] = 0,
+					.gpr[22] = 0,
+				}
 			}
 		}
 	}
-- 
2.24.1