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/* is-add-test.S. l.add, l.addc, l.addi and l.addic instruction test of Or1ksim** Copyright (C) 1999-2006 OpenCores* Copyright (C) 2010 Embecosm Limited** Contributors various OpenCores participants* Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>** This file is part of OpenRISC 1000 Architectural Simulator.** This program is free software; you can redistribute it and/or modify it* under the terms of the GNU General Public License as published by the Free* Software Foundation; either version 3 of the License, or (at your option)* any later version.** This program is distributed in the hope that it will be useful, but WITHOUT* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for* more details.** You should have received a copy of the GNU General Public License along* with this program. If not, see <http: www.gnu.org/licenses/>.*//* ----------------------------------------------------------------------------* Coding conventions are described in inst-set-test.S* ------------------------------------------------------------------------- *//* ----------------------------------------------------------------------------* Test coverage** The l.add, l.addc, l.addi and l.addic instructions should set the carry and* overflow flags.** In addition the l.addc and l.addic instructions should add in the carry* bit.** Problems in this area were reported in Bugs 1771 and 1776. Having fixed the* problem, this is (in good software engineering style), a regression test* to go with the fix.** This is not a comprehensive test of any instruction (yet).** Of course what is really needed is a comprehensive instruction test...* ------------------------------------------------------------------------- */#include "inst-set-test.h"/* ----------------------------------------------------------------------------* A macro to carry out a test of addition in registers*** Arguments* set_flags: Flags to set in the SR* clr_flags: Flags to clear in the SR* opc: The opcode* op1: First operand value* op2: Second operand value* res: Expected result* cy: Expected carry flag* ov: Expected overflow flag* ------------------------------------------------------------------------- */#define TEST_ADD(set_flags, clr_flags, opc, op1, op2, res, cy, ov) \l.mfspr r3,r0,SPR_SR ;\LOAD_CONST (r2, set_flags) /* Set flags */ ;\l.or r3,r3,r2 ;\LOAD_CONST (r2, ~clr_flags) /* Clear flags */ ;\l.and r3,r3,r2 ;\l.mtspr r0,r3,SPR_SR ;\;\LOAD_CONST (r5,op1) /* Load numbers to add */ ;\LOAD_CONST (r6,op2) ;\l.mtspr r0,r0,SPR_EPCR_BASE /* Clear record */ ;\50: opc r4,r5,r6 ;\l.mfspr r2,r0,SPR_SR /* So we can examine flags */ ;\l.mfspr r5,r0,SPR_EPCR_BASE /* What triggered exception */ ;\PUSH (r5) /* Save EPCR for later */ ;\PUSH (r2) ;\PUSH (r4) /* Save result for later */ ;\;\PUTS (" 0x") ;\PUTH (op1) ;\PUTS (" + 0x") ;\PUTH (op2) ;\;\LOAD_CONST (r2, set_flags) /* Are we adding in carry */ ;\LOAD_CONST (r4, SPR_SR_CY) ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\l.bnf 51f ;\l.nop ;\;\PUTS (" + c") /* CY set to add in? */ ;\l.j 52f ;\l.nop ;\;\51: PUTS (" ") /* CY clear to add in? */ ;\;\52: PUTS (" = 0x") ;\PUTH (res) ;\PUTS (": ") ;\POP (r4) ;\CHECK_RES1 (r4, res) ;\;\POP(r2) /* Retrieve SR */ ;\PUSH(r2) ;\LOAD_CONST (r4, SPR_SR_CY) /* The carry bit */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\CHECK_FLAG ("- carry flag set: ", cy) ;\;\POP(r2) /* Retrieve SR */ ;\LOAD_CONST (r4, SPR_SR_OV) /* The overflow bit */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\CHECK_FLAG ("- overflow flag set: ", ov) ;\;\POP (r2) /* Retrieve EPCR */ ;\LOAD_CONST (r4, 50b) /* The opcode of interest */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\l.bnf 53f ;\;\PUTS (" - exception triggered: TRUE\n") ;\l.j 54f ;\l.nop ;\;\53: PUTS (" - exception triggered: FALSE\n") ;\54:/* ----------------------------------------------------------------------------* A macro to carry out a test of addition with an immediate value*** Arguments* set_flags: Flags to set in the SR* clr_flags: Flags to clear in the SR* opc: The opcode* op1: First operand value* op2: Second operand value (immediate)* res: Expected result* cy: Expected carry flag* ov: Expected overflow flag* ------------------------------------------------------------------------- */#define TEST_ADDI(set_flags, clr_flags, opc, op1, op2, res, cy, ov) \l.mfspr r3,r0,SPR_SR ;\LOAD_CONST (r2, set_flags) /* Set flags */ ;\l.or r3,r3,r2 ;\LOAD_CONST (r2, ~clr_flags) /* Clear flags */ ;\l.and r3,r3,r2 ;\l.mtspr r0,r3,SPR_SR ;\;\LOAD_CONST (r5,op1) /* Load numbers to add */ ;\l.mtspr r0,r0,SPR_EPCR_BASE /* Clear record */ ;\55: opc r4,r5,op2 ;\l.mfspr r2,r0,SPR_SR /* So we can examine flags */ ;\l.mfspr r5,r0,SPR_EPCR_BASE /* What triggered exception */ ;\PUSH (r5) /* Save EPCR for later */ ;\PUSH (r2) ;\PUSH (r4) /* Save result for later */ ;\;\PUTS (" 0x") ;\PUTH (op1) ;\PUTS (" + 0x") ;\PUTH (op2) ;\;\LOAD_CONST (r2, set_flags) /* Are we adding in carry */ ;\LOAD_CONST (r4, SPR_SR_CY) ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\l.bnf 56f ;\l.nop ;\;\PUTS (" + c") /* CY set to add in? */ ;\l.j 57f ;\l.nop ;\;\56: PUTS (" ") /* CY clear to add in? */ ;\;\57: PUTS (" = 0x") ;\PUTH (res) ;\PUTS (": ") ;\POP (r4) ;\CHECK_RES1 (r4, res) ;\;\POP(r2) /* Retrieve SR */ ;\PUSH(r2) ;\LOAD_CONST (r4, SPR_SR_CY) /* The carry bit */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\CHECK_FLAG ("- carry flag set: ", cy) ;\;\POP(r2) /* Retrieve SR */ ;\LOAD_CONST (r4, SPR_SR_OV) /* The overflow bit */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\CHECK_FLAG ("- overflow flag set: ", ov) ;\;\POP (r2) /* Retrieve EPCR */ ;\LOAD_CONST (r4, 55b) /* The opcode of interest */ ;\l.and r2,r2,r4 ;\l.sfeq r2,r4 ;\l.bnf 58f ;\;\PUTS (" - exception triggered: TRUE\n") ;\l.j 59f ;\l.nop ;\;\58: PUTS (" - exception triggered: FALSE\n") ;\59:/* ----------------------------------------------------------------------------* Start of code* ------------------------------------------------------------------------- */.section .text.global _start_start:l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, ~SPR_SR_OVE) /* Clear OVE */l.and r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag cleared **\n")l.jal _putsl.nop/* ----------------------------------------------------------------------------* Test of add signed, l.add* ------------------------------------------------------------------------- */_add:LOAD_STR (r3, "l.add\n")l.jal _putsl.nop/* Add two small positive numbers */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 1, 2, 3,FALSE, FALSE)/* Check carry in is ignored. */TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.add, 1, 2, 3,FALSE, FALSE)/* Add two small negative numbers. Sets the carry flag but not theoverflow flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0xffffffff, 0xfffffffe, 0xfffffffd,TRUE, FALSE)/* Add two quite large positive numbers. Should set neither theoverflow nor the carry flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0x40000000, 0x3fffffff, 0x7fffffff,FALSE, FALSE)/* Add two large positive numbers. Should set the overflow, but notthe carry flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0x40000000, 0x40000000, 0x80000000,FALSE, TRUE)/* Add two quite large negative numbers. Should set the carry, but notthe overflow flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0xc0000000, 0xc0000000, 0x80000000,TRUE, FALSE)/* Add two large negative numbers. Should set both the overflow andcarry flags. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0xbfffffff, 0xbfffffff, 0x7ffffffe,TRUE, TRUE)/* Check that range exceptions are triggered */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, SPR_SR_OVE) /* Set OVE */l.or r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag set **\n")l.jal _putsl.nop/* Check that an overflow alone causes a RANGE Exception. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0x40000000, 0x40000000, 0x80000000,FALSE, TRUE)/* Check that a carry alone does not cause a RANGE Exception. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0xffffffff, 0xfffffffe, 0xfffffffd,TRUE, FALSE)/* Check that carry and overflow together cause an exception. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.add, 0xbfffffff, 0xbfffffff, 0x7ffffffe,TRUE, TRUE)/* Finished checking range exceptions */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, ~SPR_SR_OVE) /* Clear OVE */l.and r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag cleared **\n")l.jal _putsl.nop/* ----------------------------------------------------------------------------* Test of add signed and carry, l.addc* ------------------------------------------------------------------------- */_addc:LOAD_STR (r3, "l.addc\n")l.jal _putsl.nop/* Add two small positive numbers */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 1, 2, 3,FALSE, FALSE)/* Add two small negative numbers. Sets the carry flag but not theoverflow flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0xffffffff, 0xfffffffe, 0xfffffffd,TRUE, FALSE)/* Add two quite large positive numbers. Should set neither theoverflow nor the carry flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0x40000000, 0x3fffffff, 0x7fffffff,FALSE, FALSE)/* Add two quite large positive numbers with a carry in. Should setthe overflow but not the carry flag. */TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0x40000000, 0x3fffffff, 0x80000000,FALSE, TRUE)/* Add two large positive numbers. Should set the overflow, but notthe carry flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0x40000000, 0x40000000, 0x80000000,FALSE, TRUE)/* Add the largest unsigned value to zero with a carry. Thispotentially can break a simplistic test for carry that does notconsider the carry flag properly. Do it both ways around. */TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0xffffffff, 0x00000000, 0x00000000,TRUE, FALSE)TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0x00000000, 0xffffffff, 0x00000000,TRUE, FALSE)/* Add two quite large negative numbers. Should set the carry, but notthe overflow flag. flag. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0xc0000000, 0xc0000000, 0x80000000,TRUE, FALSE)/* Add two quite large negative numbers that would overflow, with acarry that just avoids the overflow. Should set the carry, but notthe overflow flag. flag. */TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0xc0000000, 0xbfffffff, 0x80000000,TRUE, FALSE)/* Add two large negative numbers. Should set both the overflow andcarry flags. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0xbfffffff, 0xbfffffff, 0x7ffffffe,TRUE, TRUE)/* Check that range exceptions are triggered */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, SPR_SR_OVE) /* Set OVE */l.or r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag set **\n")l.jal _putsl.nop/* Check that an overflow alone causes a RANGE Exception, even when itis the carry that causes the overflow. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0x40000000, 0x40000000, 0x80000000,FALSE, TRUE)TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0x40000000, 0x3fffffff, 0x80000000,FALSE, TRUE)/* Check that a carry alone does not cause a RANGE Exception, evenwhen it is the carry that causes the overflow. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0xffffffff, 0xfffffffe, 0xfffffffd,TRUE, FALSE)TEST_ADD (SPR_SR_CY, SPR_SR_OV,l.addc, 0x00000000, 0xffffffff, 0x00000000,TRUE, FALSE)/* Check that carry and overflow together cause an exception. */TEST_ADD (0, SPR_SR_CY | SPR_SR_OV,l.addc, 0xbfffffff, 0xbfffffff, 0x7ffffffe,TRUE, TRUE)/* Finished checking range exceptions */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, ~SPR_SR_OVE) /* Clear OVE */l.and r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag cleared **\n")l.jal _putsl.nop/* ----------------------------------------------------------------------------* Test of add signed immediate, l.addi* ------------------------------------------------------------------------- */_addi:LOAD_STR (r3, "l.addi\n")l.jal _putsl.nop/* Add two small positive numbers */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 1, 2, 3,FALSE, FALSE)/* Check carry in is ignored. */TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addi, 1, 2, 3,FALSE, FALSE)/* Add two small negative numbers. Sets the carry flag but not theoverflow flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0xffffffff, 0xfffe, 0xfffffffd,TRUE, FALSE)/* Add two quite large positive numbers. Should set neither theoverflow nor the carry flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x7fff8000, 0x7fff, 0x7fffffff,FALSE, FALSE)/* Add two large positive numbers. Should set the overflow, but notthe carry flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x7fffc000, 0x4000, 0x80000000,FALSE, TRUE)/* Add two quite large negative numbers. Should set the carry, but notthe overflow flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x80008000, 0x8000, 0x80000000,TRUE, FALSE)/* Add two large negative numbers. Should set both the overflow andcarry flags. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x80007fff, 0x8000, 0x7fffffff,TRUE, TRUE)/* Check that range exceptions are triggered */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, SPR_SR_OVE) /* Set OVE */l.or r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag set **\n")l.jal _putsl.nop/* Check that an overflow alone causes a RANGE Exception. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x7fffc000, 0x4000, 0x80000000,FALSE, TRUE)/* Check that a carry alone does not cause a RANGE Exception. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0xffffffff, 0xfffe, 0xfffffffd,TRUE, FALSE)/* Check that carry and overflow together cause an exception. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addi, 0x80007fff, 0x8000, 0x7fffffff,TRUE, TRUE)/* Finished checking range exceptions */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, ~SPR_SR_OVE) /* Clear OVE */l.and r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag cleared **\n")l.jal _putsl.nop/* ----------------------------------------------------------------------------* Test of add signed and carry, l.addic* ------------------------------------------------------------------------- */_addic:LOAD_STR (r3, "l.addic\n")l.jal _putsl.nop/* Add two small positive numbers */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 1, 2, 3,FALSE, FALSE)/* Add two small negative numbers. Sets the carry flag but not theoverflow flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0xffffffff, 0xfffe, 0xfffffffd,TRUE, FALSE)/* Add two quite large positive numbers. Should set neither theoverflow nor the carry flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x7fff8000, 0x7fff, 0x7fffffff,FALSE, FALSE)/* Add two quite large positive numbers with a carry in. Should setthe overflow but not the carry flag. */TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0x7fff8000, 0x7fff, 0x80000000,FALSE, TRUE)/* Add two large positive numbers. Should set the overflow, but notthe carry flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x7fffc000, 0x4000, 0x80000000,FALSE, TRUE)/* Add the largest unsigned value to zero with a carry. Thispotentially can break a simplistic test for carry that does notconsider the carry flag properly. Do it both ways around. */TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0xffffffff, 0x0000, 0x00000000,TRUE, FALSE)TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0x00000000, 0xffff, 0x00000000,TRUE, FALSE)/* Add two quite large negative numbers. Should set the carry, but notthe overflow flag. flag. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x80008000, 0x8000, 0x80000000,TRUE, FALSE)/* Add two quite large negative numbers that would overflow, with acarry that just avoids the overflow. Should set the carry, but notthe overflow flag. flag. */TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0x80007fff, 0x8000, 0x80000000,TRUE, FALSE)/* Add two large negative numbers. Should set both the overflow andcarry flags. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x80007fff, 0x8000, 0x7fffffff,TRUE, TRUE)/* Check that range exceptions are triggered */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, SPR_SR_OVE) /* Set OVE */l.or r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag set **\n")l.jal _putsl.nop/* Check that an overflow alone causes a RANGE Exception, even when itis the carry that causes the overflow. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x7fffc000, 0x4000, 0x80000000,FALSE, TRUE)TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0x7fffc000, 0x3fff, 0x80000000,FALSE, TRUE)/* Check that a carry alone does not cause a RANGE Exception, evenwhen it is the carry that causes the overflow. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0xffffffff, 0xfffe, 0xfffffffd,TRUE, FALSE)TEST_ADDI (SPR_SR_CY, SPR_SR_OV,l.addic, 0x00000000, 0xffff, 0x00000000,TRUE, FALSE)/* Check that carry and overflow together cause an exception. */TEST_ADDI (0, SPR_SR_CY | SPR_SR_OV,l.addic, 0x80007fff, 0x8000, 0x7fffffff,TRUE, TRUE)/* Finished checking range exceptions */l.mfspr r3,r0,SPR_SRLOAD_CONST (r2, ~SPR_SR_OVE) /* Clear OVE */l.and r3,r3,r2l.mtspr r0,r3,SPR_SRLOAD_STR (r3, " ** OVE flag cleared **\n")l.jal _putsl.nop/* ----------------------------------------------------------------------------* All done* ------------------------------------------------------------------------- */_exit:LOAD_STR (r3, "Test completed\n")l.jal _putsl.nopTEST_EXIT