From 1dca7a4700d19b289d45bcfd964ad02cdfea56b8 Mon Sep 17 00:00:00 2001 From: Luke Kenneth Casson Leighton Date: Fri, 14 Oct 2022 14:14:53 +0100 Subject: [PATCH] add max-with-getting-index-of vertical-first loop example --- .../decoder/isa/test_caller_setvl.py | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/src/openpower/decoder/isa/test_caller_setvl.py b/src/openpower/decoder/isa/test_caller_setvl.py index 058a6be7..4ce50ccd 100644 --- a/src/openpower/decoder/isa/test_caller_setvl.py +++ b/src/openpower/decoder/isa/test_caller_setvl.py @@ -977,6 +977,64 @@ class DecoderTestCase(FHDLTestCase): # check registers as expected self._check_regs(sim, expected_regs) + def test_svstep_max_idx(self): + """tests svstep with a branch, get the index of the greatest element. + uses sv.cmp and sv.isel as a temporary substitute for sv.max, + but also uses the same trick when getting the srcstep. + """ + lst = SVP64Asm(["setvl 0, 0, 5, 1, 1, 1", + 'sv.cmp 0, 1, *4, 14', # r8 contains the temp + 'sv.isel 14,*4,14,1', # copy if cmp was greater + "svstep. 12, 6, 0", # get srcstep + 'sv.isel 10,12,10,1', # copy if cmp was greater + "svstep. 0, 1, 0", # svstep (Rc=1) + "bc 6, 3, -0x24" # branch to cmp + ]) + lst = list(lst) + + # initial values in GPR regfile + initial_regs = [0] * 32 + initial_regs[4] = 0x2 + initial_regs[5] = 0x1 + initial_regs[6] = 0x7 + initial_regs[7] = 0x9 + initial_regs[8] = 0x3 + + # copy before running + expected_regs = deepcopy(initial_regs) + idx = -1 + maxval = -1 + for i in range(5): + if initial_regs[4+i] > maxval: + maxval = initial_regs[4+i] + idx = i + expected_regs[14] = maxval # largest number + expected_regs[12] = idx # index of largest + + with Program(lst, bigendian=False) as program: + sim = self.run_tst_program(program, initial_regs) + print ("SVSTATE after", bin(sim.svstate.asint())) + print (" vl", bin(sim.svstate.vl)) + print (" mvl", bin(sim.svstate.maxvl)) + print (" srcstep", bin(sim.svstate.srcstep)) + print (" dststep", bin(sim.svstate.dststep)) + print (" vfirst", bin(sim.svstate. vfirst)) + self.assertEqual(sim.svstate.vl, 5) + self.assertEqual(sim.svstate.maxvl, 5) + self.assertEqual(sim.svstate.srcstep, 0) + self.assertEqual(sim.svstate.dststep, 0) + # when end reached, vertical mode is exited + self.assertEqual(sim.svstate.vfirst, 0) + CR0 = sim.crl[0] + print(" CR0", bin(CR0.get_range().value)) + self.assertEqual(CR0[CRFields.EQ], 0) + self.assertEqual(CR0[CRFields.LT], 0) + self.assertEqual(CR0[CRFields.GT], 0) + self.assertEqual(CR0[CRFields.SO], 1) + + # check registers as expected + self._check_regs(sim, expected_regs) + def test_svremap(self): """svremap, see if values get set """ -- 2.30.2