73 lines
1.7 KiB
ArmAsm
73 lines
1.7 KiB
ArmAsm
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/*---------------------------------------------------------------------------+
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| poly_mul64.S |
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| Multiply two 64 bit integers. |
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| Copyright (C) 1992 W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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| Call from C as: |
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| void mul64(long long *a, long long *b, long long *result) |
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+---------------------------------------------------------------------------*/
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#include "fpu_asm.h"
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.text
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.align 2,144
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.globl _mul64
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_mul64:
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pushl %ebp
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movl %esp,%ebp
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subl $16,%esp
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pushl %esi
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pushl %ebx
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movl PARAM1,%esi
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movl PARAM2,%ecx
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movl PARAM3,%ebx
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xor %eax,%eax
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movl %eax,-4(%ebp)
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movl %eax,-8(%ebp)
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movl (%esi),%eax
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mull (%ecx)
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movl %eax,-16(%ebp) /* Not used */
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movl %edx,-12(%ebp)
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movl (%esi),%eax
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mull 4(%ecx)
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addl %eax,-12(%ebp)
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adcl %edx,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax
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mull (%ecx)
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addl %eax,-12(%ebp)
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adcl %edx,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax
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mull 4(%ecx)
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addl %eax,-8(%ebp)
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adcl %edx,-4(%ebp)
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testb $128,-9(%ebp)
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je L_no_round
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addl $1,-8(%ebp)
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adcl $0,-4(%ebp)
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L_no_round:
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movl -8(%ebp),%esi
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movl %esi,(%ebx)
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movl -4(%ebp),%esi
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movl %esi,4(%ebx)
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popl %ebx
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popl %esi
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leave
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ret
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