[PATCH v4 3/3] powerpc test_emulate_step: add testcases for divde[.] and divdeu[.] instructions

[Balamuruhan S]

add testcases for divde, divde., divdeu, divdeu. emulated
instructions to cover few scenarios,
        * with same dividend and divisor to have undefine RT
          for divdeu[.]
        * with divide by zero to have undefine RT for both
          divde[.] and divdeu[.]
        * with negative dividend to cover -|divisor| < r <= 0 if
          the dividend is negative for divde[.]
        * normal case with proper dividend and divisor for both
          divde[.] and divdeu[.]

Reviewed-by: Sandipan Das <sandipan at linux.ibm.com>
Signed-off-by: Balamuruhan S <bala24 at linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
---
 arch/powerpc/lib/test_emulate_step.c | 164 +++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)

diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c
index 53df4146dd32..eb1dea47a637 100644
--- a/arch/powerpc/lib/test_emulate_step.c
+++ b/arch/powerpc/lib/test_emulate_step.c
@@ -54,6 +54,14 @@
 					___PPC_RA(a) | ___PPC_RB(b))
 #define TEST_ADDC_DOT(t, a, b)	(PPC_INST_ADDC | ___PPC_RT(t) |		\
 					___PPC_RA(a) | ___PPC_RB(b) | 0x1)
+#define TEST_DIVDE(t, a, b)	(PPC_INST_DIVDE | ___PPC_RT(t) |	\
+					___PPC_RA(a) | ___PPC_RB(b))
+#define TEST_DIVDE_DOT(t, a, b)	(PPC_INST_DIVDE | ___PPC_RT(t) |	\
+					___PPC_RA(a) | ___PPC_RB(b) | 0x1)
+#define TEST_DIVDEU(t, a, b)	(PPC_INST_DIVDEU | ___PPC_RT(t) |	\
+					___PPC_RA(a) | ___PPC_RB(b))
+#define TEST_DIVDEU_DOT(t, a, b)(PPC_INST_DIVDEU | ___PPC_RT(t) |	\
+					___PPC_RA(a) | ___PPC_RB(b) | 0x1)
 
 #define MAX_SUBTESTS	16
 
@@ -838,6 +846,162 @@ static struct compute_test compute_tests[] = {
 				}
 			}
 		}
+	},
+	{
+		.mnemonic = "divde",
+		.subtests = {
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MIN",
+				.instr = TEST_DIVDE(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MIN,
+				}
+			},
+			{
+				.descr = "RA = 1L, RB = 0",
+				.instr = TEST_DIVDE(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = 1L,
+					.gpr[22] = 0,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MAX",
+				.instr = TEST_DIVDE(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MAX,
+				}
+			}
+		}
+	},
+	{
+		.mnemonic = "divde.",
+		.subtests = {
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MIN",
+				.instr = TEST_DIVDE_DOT(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MIN,
+				}
+			},
+			{
+				.descr = "RA = 1L, RB = 0",
+				.instr = TEST_DIVDE_DOT(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = 1L,
+					.gpr[22] = 0,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MAX",
+				.instr = TEST_DIVDE_DOT(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MAX,
+				}
+			}
+		}
+	},
+	{
+		.mnemonic = "divdeu",
+		.subtests = {
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MIN",
+				.instr = TEST_DIVDEU(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MIN,
+				}
+			},
+			{
+				.descr = "RA = 1L, RB = 0",
+				.instr = TEST_DIVDEU(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = 1L,
+					.gpr[22] = 0,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MAX",
+				.instr = TEST_DIVDEU(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MAX,
+				}
+			},
+			{
+				.descr = "RA = LONG_MAX - 1, RB = LONG_MAX",
+				.instr = TEST_DIVDEU(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MAX - 1,
+					.gpr[22] = LONG_MAX,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN + 1, RB = LONG_MIN",
+				.instr = TEST_DIVDEU(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = LONG_MIN + 1,
+					.gpr[22] = LONG_MIN,
+				}
+			}
+		}
+	},
+	{
+		.mnemonic = "divdeu.",
+		.subtests = {
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MIN",
+				.instr = TEST_DIVDEU_DOT(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MIN,
+				}
+			},
+			{
+				.descr = "RA = 1L, RB = 0",
+				.instr = TEST_DIVDEU_DOT(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = 1L,
+					.gpr[22] = 0,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN, RB = LONG_MAX",
+				.instr = TEST_DIVDEU_DOT(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MIN,
+					.gpr[22] = LONG_MAX,
+				}
+			},
+			{
+				.descr = "RA = LONG_MAX - 1, RB = LONG_MAX",
+				.instr = TEST_DIVDEU_DOT(20, 21, 22),
+				.regs = {
+					.gpr[21] = LONG_MAX - 1,
+					.gpr[22] = LONG_MAX,
+				}
+			},
+			{
+				.descr = "RA = LONG_MIN + 1, RB = LONG_MIN",
+				.instr = TEST_DIVDEU_DOT(20, 21, 22),
+				.flags = IGNORE_GPR(20),
+				.regs = {
+					.gpr[21] = LONG_MIN + 1,
+					.gpr[22] = LONG_MIN,
+				}
+			}
+		}
 	}
 };
 
-- 
2.24.1