powerpc/test_emulate_step: Add testcases for divde[.] and divdeu[.] instructions

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[.]

Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200728130308.1790982-4-bala24@linux.ibm.com

diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c
index d242e9f..0a201b7 100644 (file)
--- a/arch/powerpc/lib/test_emulate_step.c
+++ b/arch/powerpc/lib/test_emulate_step.c
@@ -1020,6 +1020,162 @@ static struct compute_test compute_tests[] = {
                }
        },
        {
+               .mnemonic = "divde",
+               .subtests = {
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MIN",
+                               .instr = ppc_inst(PPC_RAW_DIVDE(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MIN,
+                               }
+                       },
+                       {
+                               .descr = "RA = 1L, RB = 0",
+                               .instr = ppc_inst(PPC_RAW_DIVDE(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = 1L,
+                                       .gpr[22] = 0,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_DIVDE(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MAX,
+                               }
+                       }
+               }
+       },
+       {
+               .mnemonic = "divde.",
+               .subtests = {
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MIN",
+                               .instr = ppc_inst(PPC_RAW_DIVDE_DOT(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MIN,
+                               }
+                       },
+                       {
+                               .descr = "RA = 1L, RB = 0",
+                               .instr = ppc_inst(PPC_RAW_DIVDE_DOT(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = 1L,
+                                       .gpr[22] = 0,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_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 = ppc_inst(PPC_RAW_DIVDEU(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MIN,
+                               }
+                       },
+                       {
+                               .descr = "RA = 1L, RB = 0",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = 1L,
+                                       .gpr[22] = 0,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MAX,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MAX - 1, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MAX - 1,
+                                       .gpr[22] = LONG_MAX,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN + 1, RB = LONG_MIN",
+                               .instr = ppc_inst(PPC_RAW_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 = ppc_inst(PPC_RAW_DIVDEU_DOT(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MIN,
+                               }
+                       },
+                       {
+                               .descr = "RA = 1L, RB = 0",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU_DOT(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = 1L,
+                                       .gpr[22] = 0,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU_DOT(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN,
+                                       .gpr[22] = LONG_MAX,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MAX - 1, RB = LONG_MAX",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU_DOT(20, 21, 22)),
+                               .regs = {
+                                       .gpr[21] = LONG_MAX - 1,
+                                       .gpr[22] = LONG_MAX,
+                               }
+                       },
+                       {
+                               .descr = "RA = LONG_MIN + 1, RB = LONG_MIN",
+                               .instr = ppc_inst(PPC_RAW_DIVDEU_DOT(20, 21, 22)),
+                               .flags = IGNORE_GPR(20),
+                               .regs = {
+                                       .gpr[21] = LONG_MIN + 1,
+                                       .gpr[22] = LONG_MIN,
+                               }
+                       }
+               }
+       },
+       {
                .mnemonic = "paddi",
                .cpu_feature = CPU_FTR_ARCH_31,
                .subtests = {