70 lines
1.9 KiB
NASM
70 lines
1.9 KiB
NASM
###################################-*-asm*-
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#
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# Copyright 2009, 2010 Free Software Foundation, Inc.
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#
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# Contributed by Michael Eager <eager@eagercon.com>.
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 3, or (at your option) any
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# later version.
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#
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# GCC is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# Under Section 7 of GPL version 3, you are granted additional
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# permissions described in the GCC Runtime Library Exception, version
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# 3.1, as published by the Free Software Foundation.
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#
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# You should have received a copy of the GNU General Public License and
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# a copy of the GCC Runtime Library Exception along with this program;
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# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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# mulsi3.asm
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#
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# Multiply operation for 32 bit integers.
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# Input : Operand1 in Reg r5
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# Operand2 in Reg r6
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# Output: Result [op1 * op2] in Reg r3
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#
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#######################################
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.globl __mulsi3
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.ent __mulsi3
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.type __mulsi3,@function
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__mulsi3:
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.frame r1,0,r15
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add r3,r0,r0
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BEQI r5,$L_Result_Is_Zero # Multiply by Zero
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BEQI r6,$L_Result_Is_Zero # Multiply by Zero
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BGEId r5,$L_R5_Pos
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XOR r4,r5,r6 # Get the sign of the result
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RSUBI r5,r5,0 # Make r5 positive
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$L_R5_Pos:
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BGEI r6,$L_R6_Pos
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RSUBI r6,r6,0 # Make r6 positive
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$L_R6_Pos:
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bri $L1
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$L2:
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add r5,r5,r5
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$L1:
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srl r6,r6
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addc r7,r0,r0
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beqi r7,$L2
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bneid r6,$L2
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add r3,r3,r5
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blti r4,$L_NegateResult
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rtsd r15,8
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nop
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$L_NegateResult:
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rtsd r15,8
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rsub r3,r3,r0
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$L_Result_Is_Zero:
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rtsd r15,8
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addi r3,r0,0
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.end __mulsi3
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.size __mulsi3, . - __mulsi3
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