Subversion Repositories openrisc_2011-10-31

/* fp.S. Floating point instruction set test of Or1ksim

   Copyright (C) 1999-2006 OpenCores

   Copyright (C) 2010 Embecosm Limited

   Copyright (C) 2010 ORSoC AB

   Contributors various OpenCores participants

   Contributor Jeremy Bennett 

   Contributor Julius Baxter 

   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 .  */

/* ----------------------------------------------------------------------------

 * Test coverage

 *

 * At present the tests are only reasonably comprehensive for lf.add.s and

 * lf.div.s. This is intended as a template for future work, and still has

 * omissions even so.

 *

 * Basic tests are provided for all single precision floating point

 * numbers. Since Or1ksim translates these operations into host FP, there is

 * little point in testing more of the subtleties of IEEE 745.

 *

 * However in future this test could be used with OpenRISC hardware, in which

 * case exhaustive testing would be essential.

 * ------------------------------------------------------------------------- */

#include "spr-defs.h"

#include "board.h"

#define HAVE_LF_CUST 0

#define HAVE_LF_REM 0

#define HAVE_LF_MADD 0

/*

 * l.nop constants

 *

 */

#define NOP_NOP         0x0000      /* Normal nop instruction */

#define NOP_EXIT        0x0001      /* End of simulation */

#define NOP_REPORT      0x0002      /* Simple report */

#define NOP_PRINTF      0x0003      /* Simprintf instruction */

#define NOP_PUTC        0x0004      /* Simulation putc instruction */

#define NOP_REPORT_FIRST 0x0400     /* Report with number */

#define NOP_REPORT_LAST  0x03ff      /* Report with number */

/* ----------------------------------------------------------------------------

 * Coding conventions

 *

 * A simple rising stack is provided to starting at _stack and pointed to by

 * r1. r1 points to the next free word. Only 32-bit registers may be pushed

 * onto the stack.

 *

 * Temporary labels up to 49 are reserved for macros and subroutines. Each is

 * used only once in any macro or subroutine. You can get in a serious mess if

 * you get local label clashing in macros.

 *

 * Arguments to functions are passed in r3 through r8.

 * r9 is the link (return address)

 * r11 is for returning results

 * r2 through r11 are not preserved across calls. All other registers are.

 * ------------------------------------------------------------------------- */

/* ----------------------------------------------------------------------------

 * Memory controller constants

 * ------------------------------------------------------------------------- */

#define MEM_RAM 0x00000000

#define MC_CSR          (0x00)

#define MC_POC          (0x04)

#define MC_BA_MASK      (0x08)

#define MC_CSC(i)       (0x10 + (i) * 8)

#define MC_TMS(i)       (0x14 + (i) * 8)

/* ----------------------------------------------------------------------------

 * Floating point constants (IEEE 754)

 *

 * For the record, the single precision format has 1 sign bit, 8 exponent bits

 * and 23 fraction bits.

 *

 *   seeeeeeeefffffffffffffffffffffff

 *

 * The exponent is biased by 2^7 - 1 (i.e 127 is subtracted from the value to

 * give the actual exponent). Normalized numbers have a non-zero exponent (up

 * to 2^8 - 2) and an implicit 1 before the fraction. Thus the value

 * represented is

 *

 *   (-1)^s * 1.fffffffffffffffffffffff * 2^(eeeeeeee - (2^7 - 1))

 *

 * Special values used are:

 *

 *  Zeroes                Exponent is zero,    fraction also zero

 *  Denormalized numbers  Exponent is zero,    fraction non-zero

 *  Infinities            Exponent is 2^8 - 1, fraction is zero

 *  NaNs                  Exponent is 2^8 - 1, fraction is non-zero

 *

 * The top bit of the fraction in a NaN is often used to indicate the type of

 * NaN. If 1, it is a "quiet" NaN, if 0 it is a "signalling" NaN. Quiet NaN's

 * are generally propagated for FP errors. Signalling NaN's can be used for

 * more unusual purposes

 *

 * In general any other bits of the NaN fraction are just propagated unchanged.

 * ------------------------------------------------------------------------- */

#define FP_S_P_ZERO    (0x00000000)     /* Positive zero */

#define FP_S_N_ZERO    (0x80000000)     /* Positive zero */

#define FP_S_P_INF     (0x7f800000)     /* Positive infinity */

#define FP_S_N_INF     (0xff800000)     /* Negative infinity */

#define FP_S_P_NAN     (0x7fc00000)     /* Positive qNaN */

#define FP_S_N_NAN     (0xffc00000)     /* Negative qNaN */

/* Some NaNs without all fraction bits set (permitted under IEEE 754) */

#define FP_S_P_NAN_B   (0x7f800001)     /* Positive NaN, not all 1s in frac */

#define FP_S_N_NAN_B   (0xff800001)     /* Negative NaN, not all 1s in frac */

/* Some single precision normalized numbers */

#define  FP_S_0_5      (0x3f000000)     /* +0.5 */

#define  FP_S_ONE      (0x3f800000)     /* +1.0 */

#define  FP_S_1_5      (0x3fc00000)     /* +1.5 */

#define  FP_S_TWO      (0x40000000)     /* +2.0 */

#define  FP_S_THREE    (0x40400000)     /* +3.0 */

#define  FP_S_LARGEST_TO_INT (0x4effffff) /* 2147483520 = 0x0x7FFFFF80*/

#define  FP_S_N_LARGEST_TO_INT (0xceffffff) /* -2147483520 = 0x0x80000080*/

#define  FP_S_HUGE1    (0x7e800000)     /* +1.0 * 2^+126 */

#define  FP_S_HUGE2    (0x7f000000)     /* +1.0 * 2^+127 */

#define  FP_S_N_0_5    (0xbf000000)     /* -0.5 */

#define  FP_S_N_ONE    (0xbf800000)     /* -1.0 */

#define  FP_S_N_1_5    (0xbfc00000)     /* -1.5 */

#define  FP_S_N_TWO    (0xc0000000)     /* -2.0 */

#define  FP_S_N_THREE  (0xc0400000)     /* -3.0 */

#define  FP_S_N_HUGE1  (0xfe800000)     /* -1.0 * 2^+126 */

#define  FP_S_N_HUGE2  (0xff000000)     /* -1.0 * 2^+127 */

/* Some denormalized numbers */

#define  FP_S_SMALL1   (0x00200000)     /* +1.0 * 2^-129 */

#define  FP_S_SMALL2   (0x00400000)     /* +1.0 * 2^-128 */

#define  FP_S_N_SMALL1 (0x80200000)     /* -1.0 * 2^-129 */

#define  FP_S_N_SMALL2 (0x80400000)     /* -1.0 * 2^-128 */

/* Indicator of completion */

#define  ALL_DONE     (0x8000000d)

/* Logical values */

#define TRUE   1

#define FALSE  0

/* ----------------------------------------------------------------------------

 * Macro to push a register onto the stack

 *

 * r1 points to the next free slot. Push the supplied register on, then

 * advance the stack pointer.

 *

 * Arguments:

 *   reg  The register to push

 *

 * Registers modified

 *   r1

 * ------------------------------------------------------------------------- */

#define PUSH(reg)                                                        \

        l.sw    0(r1),reg               /* Push */                      ;\

        l.addi  r1,r1,4                 /* Advance the stack */

/* ----------------------------------------------------------------------------

 * Macro to pop a register off the stack

 *

 * r1 points to the next free slot. Decrement the stack pointer, then pop the

 * requested register.

 *

 * Arguments:

 *   reg  The register to pop

 *

 * Registers modified

 *   r1

 * ------------------------------------------------------------------------- */

#define POP(reg)                                                         \

        l.addi  r1,r1,-4                /* Decrement the stack */       ;\

        l.lwz   reg,0(r1)               /* Pop */

/* ----------------------------------------------------------------------------

 * Macro to load a 32-bit constant into a register

 *

 * Arguments:

 *   reg  The register to load

 *   val  The value to load

 *

 * ------------------------------------------------------------------------- */

#define LOAD_CONST(reg,val)                                              \

        l.movhi reg,hi(val)                                             ;\

        l.ori   reg,reg,lo(val)

/* ----------------------------------------------------------------------------

 * Macro to define and load a pointer to a string

 *

 * Arguments:

 *   reg  The register to load

 *   str  The string

 *

 * ------------------------------------------------------------------------- */

#define LOAD_STR(reg,str)                                                \

        .section .rodata                                                ;\

1:                                                                      ;\

        .string str                                                     ;\

                                                                        ;\

        .section .text                                                  ;\

        l.movhi reg,hi(1b)                                              ;\

        l.ori   reg,reg,lo(1b)

/* ----------------------------------------------------------------------------

 * Macro to print a character

 *

 * Arguments:

 *   c  The character to print

 * ------------------------------------------------------------------------- */

#define PUTC(c)                                                          \

        l.addi  r3,r0,c                                                 ;\

        l.nop   NOP_PUTC

/* ----------------------------------------------------------------------------

 * Macro for recording the result of a test

 *

 * The test result is in r4. Print out the name of test indented two spaces,

 * followed by  ": ", either "OK" or "Failed" and a newline.

 *

 * Arguments:

 *   str  Textual name of the test

 *   reg  The result to test (not r2)

 *   val  Desired result of the test

 * ------------------------------------------------------------------------- */

#define CHECK_RES(str,reg,val)                                           \

        .section .rodata                                                ;\

2:                                                                      ;\

        .string str                                                     ;\

                                                                        ;\

        .section .text                                                  ;\

        PUSH (reg)                      /* Save the register to test */ ;\

                                                                        ;\

        LOAD_CONST (r3,2b)              /* Print out the string */      ;\

        l.jal   _ptest                                                  ;\

        l.nop                                                           ;\

                                                                        ;\

        LOAD_CONST(r2,val)              /* The desired result */        ;\

        POP (reg)                       /* The register to test */      ;\

        PUSH (reg)                      /* May need again later */      ;\

        l.sfeq  r2,reg                  /* Does the result match? */    ;\

        l.bf    3f                                                      ;\

        l.nop                                                           ;\

                                                                        ;\

        l.jal   _pfail                  /* Test failed */               ;\

        l.nop                                                           ;\

        POP (reg)                       /* Report the register */       ;\

        l.add   r3,r0,reg                                               ;\

        l.j     4f                                                      ;\

        l.nop   NOP_REPORT                                              ;\

3:                                                                      ;\

        POP (reg)                       /* Discard the register */      ;\

        l.jal   _pok                    /* Test succeeded */            ;\

        l.nop                                                           ;\

4:

/* ----------------------------------------------------------------------------

 * Macro for recording the result of a comparison

 *

 * If the flag is set print the string argument indented by 2 spaces, followed

 * by "TRUE" and a  newline, otherwise print the string argument indented by

 * two spaces, followed by "FALSE" and a newline.

 *

 * Arguments:

 *   str  Textual name of the test

 *   res  Expected result (TRUE or FALSE)

 * ------------------------------------------------------------------------- */

#define CHECK_FLAG(str,res)                                              \

        .section .rodata                                                ;\

5:                                                                      ;\

        .string str                                                     ;\

                                                                        ;\

        .section .text                                                  ;\

        l.bnf   7f                      /* Branch if result FALSE */    ;\

                                                                        ;\

        /* Branch for TRUE result */                                    ;\

        LOAD_CONST (r3,5b)              /* The string to print */       ;\

        l.jal   _ptest                                                  ;\

        l.nop                                                           ;\

                                                                        ;\

        l.addi  r2,r0,TRUE              /* Was it expected? */          ;\

        l.addi  r3,r0,res                                               ;\

        l.sfeq  r2,r3                                                   ;\

        l.bnf   6f                      /* Branch if not expected */    ;\

                                                                        ;\

        /* Sub-branch for TRUE found and expected */                    ;\

        l.jal   _ptrue                                                  ;\

        l.nop                                                           ;\

        PUTC ('\n')                                                     ;\

        l.j     9f                                                      ;\

        l.nop                                                           ;\

6:                                                                      ;\

        /* Sub-branch for TRUE found and not expected */                ;\

        l.jal   _ptrue                                                  ;\

        l.nop                                                           ;\

        l.jal   _punexpected                                            ;\

        l.nop                                                           ;\

        l.j     9f                                                      ;\

        l.nop                                                           ;\

                                                                        ;\

7:                                                                      ;\

        /* Branch for FALSE result */                                   ;\

        LOAD_CONST (r3,5b)              /* The string to print */       ;\

        l.jal   _ptest                                                  ;\

        l.nop                                                           ;\

                                                                        ;\

        l.addi  r2,r0,FALSE             /* Was it expected? */          ;\

        l.addi  r3,r0,res                                               ;\

        l.sfeq  r2,r3                                                   ;\

        l.bnf   8f                      /* Branch if not expected */    ;\

                                                                        ;\

        /* Sub-branch for FALSE found and expected */                   ;\

        l.jal   _pfalse                                                 ;\

        l.nop                                                           ;\

        PUTC ('\n')                                                     ;\

        l.j     9f                                                      ;\

        l.nop                                                           ;\

8:                                                                      ;\

        /* Sub-branch for FALSE found and not expected */               ;\

        l.jal   _pfalse                                                 ;\

        l.nop                                                           ;\

        l.jal   _punexpected                                            ;\

        l.nop                                                           ;\

9:

/* ----------------------------------------------------------------------------

 * Macro for setting rounding mode in FPCSR

 *

 * Arguments:

 *   rm  round mode macro from spr-defs.h

 * ------------------------------------------------------------------------- */

#define SET_RM(rm)                                               \

        l.mfspr r4, r0, SPR_FPCSR                               ;\

        /* Clear rounding mode bits */                          ;\

        l.ori   r4, r4, SPR_FPCSR_RM                            ;\

        l.xori  r4, r4, SPR_FPCSR_RM                            ;\

        /* Set desired rounding mode bits */                    ;\

        l.ori r4, r4, rm                                        ;\

        l.mtspr r0, r4, SPR_FPCSR

/* ----------------------------------------------------------------------------

 * Simple stack, will be pointed to by r1, which is the next empty slot

 * ------------------------------------------------------------------------- */

        .section .data

        .balign 4

        .global _stack

_stack:

        .space  0x1000,0x0

/* ---[ 0x100: RESET exception ]----------------------------------------- */

        .section .vectors, "ax"

        .org 0x100

        l.movhi r0, 0

        /* Clear status register */

        l.ori   r1, r0, SPR_SR_SM

        l.mtspr r0, r1, SPR_SR

        /* Clear timer  */

        l.mtspr r0, r0, SPR_TTMR

        /* Clear FPCSR  */

        l.mtspr r0, r0, SPR_FPCSR

        /* Init the stack */

        .global _stack

        l.movhi r1, hi(_stack)

        l.ori   r1, r1, lo(_stack)

        l.addi  r2, r0, -3

        l.and   r1, r1, r2

        /* Jump to program initialisation code */

        .global _start

        l.movhi r4, hi(_start)

        l.ori   r4, r4, lo(_start)

        l.jr    r4

        l.nop

/* ---[ 0x700: Illegal Insn. exception ]------------------------------------- */

        .org 0x700

        .global _illegal_insn

_illegal_insn:

        l.nop 0x1

        l.nop

/* ---[ 0xD00: FPU exception ]----------------------------------------------- */

        .org 0xD00

        .global _fpu_except

_fpu_except:

        l.mfspr r3, r0, SPR_FPCSR

        l.nop 0x2

        l.sw 0(r0), r3

        l.addi r3, r0, 0x6

        l.ori r3, r0, SPR_FPCSR_FPEE

        l.mtspr r0, r10, SPR_FPCSR

        l.rfe

/* =================================================== [ text section ] === */

        .section  .text

/* =================================================== [ start ] === */

        .global _start

_start:

        /* Instruction cache enable */

        /* Check if IC present and skip enabling otherwise */

        l.mfspr r24,r0,SPR_UPR

        l.andi  r26,r24,SPR_UPR_ICP

        l.sfeq  r26,r0

        l.bf    .L8

        l.nop

        /* Disable IC */

        l.mfspr r6,r0,SPR_SR

        l.addi  r5,r0,-1

        l.xori  r5,r5,SPR_SR_ICE

        l.and   r5,r6,r5

        l.mtspr r0,r5,SPR_SR

        /* Establish cache block size

        If BS=0, 16;

        If BS=1, 32;

        r14 contain block size

        */

        l.mfspr r24,r0,SPR_ICCFGR

        l.andi  r26,r24,SPR_ICCFGR_CBS

        l.srli  r28,r26,7

        l.ori   r30,r0,16

        l.sll   r14,r30,r28

        /* Establish number of cache sets

        r16 contains number of cache sets

        r28 contains log(# of cache sets)

        */

        l.andi  r26,r24,SPR_ICCFGR_NCS

        l.srli  r28,r26,3

        l.ori   r30,r0,1

        l.sll   r16,r30,r28

        /* Invalidate IC */

        l.addi  r6,r0,0

        l.sll   r5,r14,r28

.L7:

        l.mtspr r0,r6,SPR_ICBIR

        l.sfne  r6,r5

        l.bf    .L7

        l.add   r6,r6,r14

        /* Enable IC */

        l.mfspr r6,r0,SPR_SR

        l.ori   r6,r6,SPR_SR_ICE

        l.mtspr r0,r6,SPR_SR

        l.nop

        l.nop

        l.nop

        l.nop

        l.nop

        l.nop

        l.nop

        l.nop

.L8:

        /* Data cache enable */

        /* Check if DC present and skip enabling otherwise */

        l.mfspr r24,r0,SPR_UPR

        l.andi  r26,r24,SPR_UPR_DCP

        l.sfeq  r26,r0

        l.bf    .L10

        l.nop

        /* Disable DC */

        l.mfspr r6,r0,SPR_SR

        l.addi  r5,r0,-1

        l.xori  r5,r5,SPR_SR_DCE

        l.and   r5,r6,r5

        l.mtspr r0,r5,SPR_SR

        /* Establish cache block size

           If BS=0, 16;

           If BS=1, 32;

           r14 contain block size

        */

        l.mfspr r24,r0,SPR_DCCFGR

        l.andi  r26,r24,SPR_DCCFGR_CBS

        l.srli  r28,r26,7

        l.ori   r30,r0,16

        l.sll   r14,r30,r28

        /* Establish number of cache sets

           r16 contains number of cache sets

           r28 contains log(# of cache sets)

        */

        l.andi  r26,r24,SPR_DCCFGR_NCS

        l.srli  r28,r26,3

        l.ori   r30,r0,1

        l.sll   r16,r30,r28

        /* Invalidate DC */

        l.addi  r6,r0,0

        l.sll   r5,r14,r28

.L9:

        l.mtspr r0,r6,SPR_DCBIR

        l.sfne  r6,r5

        l.bf    .L9

        l.add   r6,r6,r14

        /* Enable DC */

        l.mfspr r6,r0,SPR_SR

        l.ori   r6,r6,SPR_SR_DCE

        l.mtspr r0,r6,SPR_SR

.L10:

        l.movhi r3,hi(_itof_s)          /* Code starts with addition test */

        l.ori   r3,r3,lo(_itof_s)

        l.jr    r3

        l.nop

/* ----------------------------------------------------------------------------

 * Subroutine to print out a string

 *

 * The string is followed by a newline

 *

 * Parameters:

 *  r3  Pointer to the string to print

 * ------------------------------------------------------------------------- */

_puts:

        l.add   r2,r0,r3                /* Copy the string pointer */

        /* Loop getting and printing each char until end of string */

10:

        l.lbz   r3,0(r2)

        l.sfeq  r3,r0                   /* NULL termination? */

        l.bf    11f

        l.addi  r2,r2,1                 /* Delay slot, move to next char */

        l.j     10b                     /* Repeat */

        l.nop   NOP_PUTC                /* Delay slot */

11:

        l.jr    r9                      /* Return */

        l.nop

/* ----------------------------------------------------------------------------

 * Subroutine to print out a test name prompt

 *

 * The string is preceded by two spaces

 *

 * Parameters:

 *  r3  Pointer to the test name to print

 * ------------------------------------------------------------------------- */

_ptest:

        PUSH(r9)                        /* Save the return address */

        PUSH(r3)                        /* Save the test name for later */

        LOAD_STR(r3, "  ")              /* Prefix */

        l.jal   _puts

        l.nop

        POP(r3)                         /* Test name */

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

/* ----------------------------------------------------------------------------

 * Subroutine to print out "OK"

 *

 * The string is followed by a newline

 * ------------------------------------------------------------------------- */

_pok:

        PUSH(r9)                        /* Save the return address */

        LOAD_STR(r3, "OK\n")

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

/* ----------------------------------------------------------------------------

 * Subroutine to print out "Failed"

 *

 * The string is followed by a newline

 * ------------------------------------------------------------------------- */

_pfail:

        PUSH(r9)                        /* Save the return address */

        LOAD_STR(r3, "Failed\n")

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

/* ----------------------------------------------------------------------------

 * Subroutine to print out "TRUE"

 * ------------------------------------------------------------------------- */

_ptrue:

        PUSH(r9)                        /* Save the return address */

        LOAD_STR(r3, "TRUE")

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

/* ----------------------------------------------------------------------------

 * Subroutine to print out "FALSE"

 * ------------------------------------------------------------------------- */

_pfalse:

        PUSH(r9)                        /* Save the return address */

        LOAD_STR(r3, "FALSE")

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

/* ----------------------------------------------------------------------------

 * Subroutine to print out "unexpected"

 *

 * Preceded by a space and followed by a newline

 * ------------------------------------------------------------------------- */

_punexpected:

        PUSH(r9)                        /* Save the return address */

        LOAD_STR(r3, " unexpected\n")

        l.jal   _puts

        l.nop

        POP (r9)

        l.jr    r9

        .section .text

/* ----------------------------------------------------------------------------

 * Test of single precision integer to fp conversion: lf.itof.s

 * ------------------------------------------------------------------------- */

_itof_s:

        LOAD_STR (r3, "lf.itof.s\n")

        l.jal   _puts

        l.nop

        /* Integer conversion */

        LOAD_CONST (r5,0x00000001)

        lf.itof.s  r4,r5

        CHECK_RES ("(float)  1 =  1.0: ", r4, FP_S_ONE)

        LOAD_CONST (r5,0xffffffff)

        lf.itof.s  r4,r5

        CHECK_RES ("(float) -1 = -1.0: ", r4, FP_S_N_ONE)

        LOAD_CONST (r5,0x00000000)

        lf.itof.s  r4,r5

        CHECK_RES ("(float) +0 =  0.0: ", r4, FP_S_P_ZERO)

/* ----------------------------------------------------------------------------

 * Test of single precision fp to integer conversion: lf.ftoi.s

 * ------------------------------------------------------------------------- */

_ftoi_s:

        LOAD_STR (r3, "lf.ftoi.s\n")

        l.jal   _puts

        l.nop

        /* Integer conversion */

        LOAD_CONST (r5,FP_S_ONE)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int)  1.0          =  1:    ", r4, 0x00000001)

        LOAD_CONST (r5,FP_S_N_ONE)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -1.0          = -1:    ", r4, 0xffffffff)

        LOAD_CONST (r5,FP_S_P_ZERO)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) +0.0          =  0:    ", r4, 0x00000000)

        LOAD_CONST (r5,FP_S_N_ZERO)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -0.0          =  0:    ", r4, 0x00000000)

        LOAD_CONST(r5,FP_S_LARGEST_TO_INT)

        lf.ftoi.s r4, r5

        CHECK_RES("(int) 2147483520.0   = 2147483520  ", r4, 0x7FFFFF80)

        LOAD_CONST(r5,FP_S_N_LARGEST_TO_INT)

        lf.ftoi.s r4, r5

        CHECK_RES("(int) -2147483520.0  = -2147483520  ", r4, 0x80000080)

        /* Fractional conversion (round towards zero) */

        SET_RM  (FPCSR_RM_RZ)

        LOAD_CONST (r5,FP_S_1_5)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int)  1.5          =  1:    ", r4, 0x00000001)

        LOAD_CONST (r5,FP_S_N_1_5)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -1.5          = -1:    ", r4, 0xffffffff)

        /* Conversion of values too big */

        LOAD_CONST (r5,FP_S_HUGE1)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int)  1.0 * 2^126  = 2^31: ", r4, 0x7fffffff)

        LOAD_CONST (r5,FP_S_N_HUGE1)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -1.0 * 2^126  = -2^31: ", r4, 0x80000000)

        /* Conversion of very small values */

        LOAD_CONST (r5,FP_S_SMALL1)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int)  1.0 * 2^-129 =  0:    ", r4, 0x00000000)

        LOAD_CONST (r5,FP_S_N_SMALL1)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -1.0 * 2^-129 =  0:    ", r4, 0x00000000)

        /* Just basic check of Infinity & NaN */

        LOAD_CONST (r5,FP_S_P_INF)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) +inf          = 2^31: ", r4, 0x7fffffff)

        LOAD_CONST (r5,FP_S_N_INF)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -inf          = -2^31: ", r4, 0x80000000)

        LOAD_CONST (r5,FP_S_P_NAN)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) +NaN          = 2^31: ", r4, 0x7fffffff)

        LOAD_CONST (r5,FP_S_N_NAN)

        lf.ftoi.s  r4,r5

        CHECK_RES ("(int) -NaN          = 2^31: ", r4, 0x7fffffff)

/* ----------------------------------------------------------------------------

 * Test of single precision add: lf.add.s

 * ------------------------------------------------------------------------- */

_add_s:

        LOAD_STR (r3, "lf.add.s\n")

        l.jal   _puts

        l.nop

        /* Simple integer addition */

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_P_ZERO)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 +  0.0  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_ZERO)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -0.0  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_ONE)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 +  1.0  =  2.0:  ", r4, FP_S_TWO)

        LOAD_CONST (r5,FP_S_TWO)

        LOAD_CONST (r6,FP_S_ONE)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 2.0 +  1.0  =  3.0:  ", r4, FP_S_THREE)

        /* Fractional addition */

        LOAD_CONST (r5,FP_S_1_5)

        LOAD_CONST (r6,FP_S_1_5)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.5 +  1.5  =  3.0:  ", r4, FP_S_THREE)

        /* Addition with negative numbers */

        LOAD_CONST (r5,FP_S_TWO)

        LOAD_CONST (r6,FP_S_N_ONE)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 2.0 + -1.0  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_TWO)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -2.0  = -1.0:  ", r4, FP_S_N_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_ONE)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -1.0  = +0.0:  ", r4, FP_S_P_ZERO)

        /* Addition with infinities */

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_P_INF)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + +inf  = +inf:  ", r4, FP_S_P_INF)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_INF)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -inf  = -inf:  ", r4, FP_S_N_INF)

        LOAD_CONST (r5,FP_S_P_INF)

        LOAD_CONST (r6,FP_S_P_INF)

        lf.add.s  r4,r5,r6

        CHECK_RES ("+inf + +inf  = +inf:  ", r4, FP_S_P_INF)

        LOAD_CONST (r5,FP_S_P_INF)

        LOAD_CONST (r6,FP_S_N_INF)

        lf.add.s  r4,r5,r6

        CHECK_RES ("+inf + -inf  = -NaN:  ", r4, FP_S_N_NAN)

        LOAD_CONST (r5,FP_S_N_INF)

        LOAD_CONST (r6,FP_S_N_INF)

        lf.add.s  r4,r5,r6

        CHECK_RES ("-inf + -inf  = -inf:  ", r4, FP_S_N_INF)

        /* Addition with NaNs */

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_P_NAN)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + +NaN  = +NaN:  ", r4, FP_S_P_NAN)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_NAN)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -NaN  = -NaN:  ", r4, FP_S_N_NAN)

        LOAD_CONST (r5,FP_S_P_NAN)

        LOAD_CONST (r6,FP_S_P_NAN)

        lf.add.s  r4,r5,r6

        CHECK_RES ("+NaN + +NaN  = +NaN:  ", r4, FP_S_P_NAN)

        LOAD_CONST (r5,FP_S_P_NAN)

        LOAD_CONST (r6,FP_S_N_NAN)

        lf.add.s  r4,r5,r6

        CHECK_RES ("+NaN + -NaN  = +NaN:  ", r4, FP_S_P_NAN)

        LOAD_CONST (r5,FP_S_N_NAN)

        LOAD_CONST (r6,FP_S_N_NAN)

        lf.add.s  r4,r5,r6

        CHECK_RES ("-NaN + -NaN  = -NaN:  ", r4, FP_S_N_NAN)

        // The qNaN output here may be with or without 0x1 in LSByte

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_P_NAN_B)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + +sNaN = +qNaN: ", r4, 0x7fc00000)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_NAN_B)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 + -sNaN = -qNaN: ", r4, 0xffc00000)

        /* Addition with overflow */

        LOAD_CONST (r5,FP_S_HUGE2)

        LOAD_CONST (r6,FP_S_HUGE2)

        lf.add.s  r4,r5,r6

        CHECK_RES (" 1.0 * 2^127 +  1.0 * 2^127  = +inf:  ", r4, FP_S_P_INF)

        LOAD_CONST (r5,FP_S_N_HUGE2)

        LOAD_CONST (r6,FP_S_N_HUGE2)

        lf.add.s  r4,r5,r6

        CHECK_RES ("-1.0 * 2^127 + -1.0 * 2^127  = -inf:  ", r4, FP_S_N_INF)

/* ----------------------------------------------------------------------------

 * Test of single precision subtract: lf.sub.s

 * ------------------------------------------------------------------------- */

_sub_s:

        LOAD_STR (r3, "lf.sub.s\n")

        l.jal   _puts

        l.nop

        SET_RM  (FPCSR_RM_RIP)

        /* Simple integer subtraction */

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_P_ZERO)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 1.0 -  0.0  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_N_ZERO)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 1.0 - -0.0  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_ONE)

        LOAD_CONST (r6,FP_S_ONE)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 1.0 -  1.0  = +0.0:  ", r4, FP_S_P_ZERO)

        LOAD_CONST (r5,FP_S_TWO)

        LOAD_CONST (r6,FP_S_ONE)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 2.0 -  1.0  =  1.0:  ", r4, FP_S_ONE)

        /* Fractional subtraction */

        LOAD_CONST (r5,FP_S_1_5)

        LOAD_CONST (r6,FP_S_1_5)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 1.5 -  1.5  = +0.0:  ", r4, FP_S_P_ZERO)

        LOAD_CONST (r5,FP_S_1_5)

        LOAD_CONST (r6,FP_S_0_5)

        lf.sub.s  r4,r5,r6

        CHECK_RES (" 1.5 -  0.5  =  1.0:  ", r4, FP_S_ONE)

        LOAD_CONST (r5,FP_S_1_5)

        LOAD_CONST (r6,FP_S_ONE)

        lf.sub.s  r4,r5,r6