177 lines
4.1 KiB
ArmAsm
177 lines
4.1 KiB
ArmAsm
/*---------------------------------------------------------------------------+
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| mul_Xsig.S |
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| Multiply a 12 byte fixed point number by another fixed point number. |
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| Copyright (C) 1992,1994,1995 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@jacobi.maths.monash.edu.au |
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| Call from C as: |
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| void mul32_Xsig(Xsig *x, unsigned b) |
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| void mul64_Xsig(Xsig *x, unsigned long long *b) |
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| void mul_Xsig_Xsig(Xsig *x, unsigned *b) |
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| The result is neither rounded nor normalized, and the ls bit or so may |
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| be wrong. |
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+---------------------------------------------------------------------------*/
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.file "mul_Xsig.S"
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#include "fpu_emu.h"
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.text
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ENTRY(mul32_Xsig)
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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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movl PARAM1,%esi
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movl PARAM2,%ecx
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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 /* lsl of Xsig */
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mull %ecx /* msl of b */
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movl %edx,-12(%ebp)
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movl 4(%esi),%eax /* midl of Xsig */
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mull %ecx /* msl of b */
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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 8(%esi),%eax /* msl of Xsig */
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mull %ecx /* msl of b */
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addl %eax,-8(%ebp)
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adcl %edx,-4(%ebp)
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movl -12(%ebp),%eax
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movl %eax,(%esi)
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movl -8(%ebp),%eax
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movl %eax,4(%esi)
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movl -4(%ebp),%eax
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movl %eax,8(%esi)
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popl %esi
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leave
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ret
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ENTRY(mul64_Xsig)
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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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movl PARAM1,%esi
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movl PARAM2,%ecx
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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 /* lsl of Xsig */
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mull 4(%ecx) /* msl of b */
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movl %edx,-12(%ebp)
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movl 4(%esi),%eax /* midl of Xsig */
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mull (%ecx) /* lsl of b */
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addl %edx,-12(%ebp)
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adcl $0,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax /* midl of Xsig */
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mull 4(%ecx) /* msl of b */
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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 8(%esi),%eax /* msl of Xsig */
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mull (%ecx) /* lsl of b */
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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 8(%esi),%eax /* msl of Xsig */
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mull 4(%ecx) /* msl of b */
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addl %eax,-8(%ebp)
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adcl %edx,-4(%ebp)
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movl -12(%ebp),%eax
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movl %eax,(%esi)
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movl -8(%ebp),%eax
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movl %eax,4(%esi)
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movl -4(%ebp),%eax
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movl %eax,8(%esi)
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popl %esi
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leave
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ret
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ENTRY(mul_Xsig_Xsig)
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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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movl PARAM1,%esi
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movl PARAM2,%ecx
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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 /* lsl of Xsig */
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mull 8(%ecx) /* msl of b */
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movl %edx,-12(%ebp)
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movl 4(%esi),%eax /* midl of Xsig */
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mull 4(%ecx) /* midl of b */
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addl %edx,-12(%ebp)
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adcl $0,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 8(%esi),%eax /* msl of Xsig */
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mull (%ecx) /* lsl of b */
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addl %edx,-12(%ebp)
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adcl $0,-8(%ebp)
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adcl $0,-4(%ebp)
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movl 4(%esi),%eax /* midl of Xsig */
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mull 8(%ecx) /* msl of b */
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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 8(%esi),%eax /* msl of Xsig */
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mull 4(%ecx) /* midl of b */
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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 8(%esi),%eax /* msl of Xsig */
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mull 8(%ecx) /* msl of b */
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addl %eax,-8(%ebp)
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adcl %edx,-4(%ebp)
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movl -12(%ebp),%edx
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movl %edx,(%esi)
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movl -8(%ebp),%edx
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movl %edx,4(%esi)
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movl -4(%ebp),%edx
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movl %edx,8(%esi)
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popl %esi
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leave
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ret
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