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annotate libgcc/config/microblaze/modsi3.asm @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
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children
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rev   line source
68
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 ###################################
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 # Copyright 2009, 2010 Free Software Foundation, Inc.
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4 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 # Contributed by Michael Eager <eager@eagercon.com>.
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6 #
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7 # This file is free software; you can redistribute it and/or modify it
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 # under the terms of the GNU General Public License as published by the
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9 # Free Software Foundation; either version 3, or (at your option) any
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10 # later version.
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11 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 # GCC is distributed in the hope that it will be useful, but WITHOUT
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13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 # License for more details.
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16 #
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17 # Under Section 7 of GPL version 3, you are granted additional
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 # permissions described in the GCC Runtime Library Exception, version
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19 # 3.1, as published by the Free Software Foundation.
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20 #
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21 # You should have received a copy of the GNU General Public License and
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 # a copy of the GCC Runtime Library Exception along with this program;
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23 # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 # <http://www.gnu.org/licenses/>.
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25 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 # modsi3.asm
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28 # modulo operation for 32 bit integers.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 # Input : op1 in Reg r5
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30 # op2 in Reg r6
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31 # Output: op1 mod op2 in Reg r3
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32 #
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33 #######################################
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34
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35 .globl __modsi3
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36 .ent __modsi3
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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37 .type __modsi3,@function
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38 __modsi3:
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 .frame r1,0,r15
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40
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 addik r1,r1,-16
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 swi r28,r1,0
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 swi r29,r1,4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 swi r30,r1,8
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45 swi r31,r1,12
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46
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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47 BEQI r6,$LaDiv_By_Zero # Div_by_Zero # Division Error
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48 BEQI r5,$LaResult_Is_Zero # Result is Zero
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49 BGEId r5,$LaR5_Pos
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50 ADD r28,r5,r0 # Get the sign of the result [ Depends only on the first arg]
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51 RSUBI r5,r5,0 # Make r5 positive
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52 $LaR5_Pos:
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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53 BGEI r6,$LaR6_Pos
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54 RSUBI r6,r6,0 # Make r6 positive
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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55 $LaR6_Pos:
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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56 ADDIK r3,r0,0 # Clear mod
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57 ADDIK r30,r0,0 # clear div
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58 ADDIK r29,r0,32 # Initialize the loop count
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59 # First part try to find the first '1' in the r5
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60 $LaDIV1:
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61 ADD r5,r5,r5 # left shift logical r5
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62 BGEID r5,$LaDIV1 #
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63 ADDIK r29,r29,-1
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64 $LaDIV2:
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65 ADD r5,r5,r5 # left shift logical r5 get the '1' into the Carry
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66 ADDC r3,r3,r3 # Move that bit into the Mod register
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67 rSUB r31,r6,r3 # Try to subtract (r30 a r6)
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68 BLTi r31,$LaMOD_TOO_SMALL
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69 OR r3,r0,r31 # Move the r31 to mod since the result was positive
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70 ADDIK r30,r30,1
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71 $LaMOD_TOO_SMALL:
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72 ADDIK r29,r29,-1
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73 BEQi r29,$LaLOOP_END
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74 ADD r30,r30,r30 # Shift in the '1' into div
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75 BRI $LaDIV2 # Div2
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76 $LaLOOP_END:
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77 BGEI r28,$LaRETURN_HERE
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78 BRId $LaRETURN_HERE
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79 rsubi r3,r3,0 # Negate the result
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80 $LaDiv_By_Zero:
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81 $LaResult_Is_Zero:
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82 or r3,r0,r0 # set result to 0 [Both mod as well as div are 0]
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83 $LaRETURN_HERE:
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84 # Restore values of CSRs and that of r3 and the divisor and the dividend
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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85 lwi r28,r1,0
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86 lwi r29,r1,4
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87 lwi r30,r1,8
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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88 lwi r31,r1,12
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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89 rtsd r15,8
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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90 addik r1,r1,16
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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91 .end __modsi3
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92 .size __modsi3, . - __modsi3
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93