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1 | ###################################-*-asm*- |
| 2 | # |
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3 | # Copyright (C) 2009-2019 Free Software Foundation, Inc. |
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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 | # |
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26 | # mulsi3.S |
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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 | |
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35 | /* An executable stack is *not* required for these functions. */ |
| 36 | #ifdef __linux__ |
| 37 | .section .note.GNU-stack,"",%progbits |
| 38 | .previous |
| 39 | #endif |
| 40 | |
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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 |
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