libgcc/config/microblaze/mulsi3.S

   1 ###################################-*-asm*-
   2 #
   3 #  Copyright (C) 2009-2019 Free Software Foundation, Inc.
   4 #
   5 #  Contributed by Michael Eager <eager@eagercon.com>.
   6 #
   7 #  This file is free software; you can redistribute it and/or modify it
   8 #  under the terms of the GNU General Public License as published by the
   9 #  Free Software Foundation; either version 3, or (at your option) any
  10 #  later version.
  11 #
  12 #  GCC is distributed in the hope that it will be useful, but WITHOUT
  13 #  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 #  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15 #  License for more details.
  16 #
  17 #  Under Section 7 of GPL version 3, you are granted additional
  18 #  permissions described in the GCC Runtime Library Exception, version
  19 #  3.1, as published by the Free Software Foundation.
  20 #
  21 #  You should have received a copy of the GNU General Public License and
  22 #  a copy of the GCC Runtime Library Exception along with this program;
  23 #  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 #  <http://www.gnu.org/licenses/>.
  25 #
  26 #  mulsi3.S
  27 #
  28 #  Multiply operation for 32 bit integers.
  29 #       Input : Operand1 in Reg r5
  30 #               Operand2 in Reg r6
  31 #       Output: Result [op1 * op2] in Reg r3
  32 #
  33 #######################################
  34
  35 /* An executable stack is *not* required for these functions.  */
  36 #ifdef __linux__
  37 .section .note.GNU-stack,"",%progbits
  38 .previous
  39 #endif
  40
  41         .globl  __mulsi3
  42         .ent    __mulsi3
  43         .type   __mulsi3,@function
  44 __mulsi3:
  45         .frame  r1,0,r15
  46         add     r3,r0,r0
  47         BEQI    r5,$L_Result_Is_Zero      # Multiply by Zero
  48         BEQI    r6,$L_Result_Is_Zero      # Multiply by Zero
  49         BGEId   r5,$L_R5_Pos
  50         XOR     r4,r5,r6                  # Get the sign of the result
  51         RSUBI   r5,r5,0                   # Make r5 positive
  52 $L_R5_Pos:
  53         BGEI    r6,$L_R6_Pos
  54         RSUBI   r6,r6,0                   # Make r6 positive
  55 $L_R6_Pos:
  56         bri     $L1
  57 $L2:
  58         add     r5,r5,r5
  59 $L1:
  60         srl     r6,r6
  61         addc    r7,r0,r0
  62         beqi    r7,$L2
  63         bneid   r6,$L2
  64         add     r3,r3,r5
  65         blti    r4,$L_NegateResult
  66         rtsd    r15,8
  67         nop
  68 $L_NegateResult:
  69         rtsd    r15,8
  70         rsub    r3,r3,r0
  71 $L_Result_Is_Zero:
  72         rtsd    r15,8
  73         addi    r3,r0,0
  74         .end __mulsi3
  75         .size   __mulsi3, . - __mulsi3