mul_Xsig.S
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:4k
- /*---------------------------------------------------------------------------+
- | mul_Xsig.S |
- | |
- | Multiply a 12 byte fixed point number by another fixed point number. |
- | |
- | Copyright (C) 1992,1994,1995 |
- | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
- | Australia. E-mail billm@jacobi.maths.monash.edu.au |
- | |
- | Call from C as: |
- | void mul32_Xsig(Xsig *x, unsigned b) |
- | |
- | void mul64_Xsig(Xsig *x, unsigned long long *b) |
- | |
- | void mul_Xsig_Xsig(Xsig *x, unsigned *b) |
- | |
- | The result is neither rounded nor normalized, and the ls bit or so may |
- | be wrong. |
- | |
- +---------------------------------------------------------------------------*/
- .file "mul_Xsig.S"
- #include "fpu_emu.h"
- .text
- ENTRY(mul32_Xsig)
- pushl %ebp
- movl %esp,%ebp
- subl $16,%esp
- pushl %esi
- movl PARAM1,%esi
- movl PARAM2,%ecx
- xor %eax,%eax
- movl %eax,-4(%ebp)
- movl %eax,-8(%ebp)
- movl (%esi),%eax /* lsl of Xsig */
- mull %ecx /* msl of b */
- movl %edx,-12(%ebp)
- movl 4(%esi),%eax /* midl of Xsig */
- mull %ecx /* msl of b */
- addl %eax,-12(%ebp)
- adcl %edx,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull %ecx /* msl of b */
- addl %eax,-8(%ebp)
- adcl %edx,-4(%ebp)
- movl -12(%ebp),%eax
- movl %eax,(%esi)
- movl -8(%ebp),%eax
- movl %eax,4(%esi)
- movl -4(%ebp),%eax
- movl %eax,8(%esi)
- popl %esi
- leave
- ret
- ENTRY(mul64_Xsig)
- pushl %ebp
- movl %esp,%ebp
- subl $16,%esp
- pushl %esi
- movl PARAM1,%esi
- movl PARAM2,%ecx
- xor %eax,%eax
- movl %eax,-4(%ebp)
- movl %eax,-8(%ebp)
- movl (%esi),%eax /* lsl of Xsig */
- mull 4(%ecx) /* msl of b */
- movl %edx,-12(%ebp)
- movl 4(%esi),%eax /* midl of Xsig */
- mull (%ecx) /* lsl of b */
- addl %edx,-12(%ebp)
- adcl $0,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 4(%esi),%eax /* midl of Xsig */
- mull 4(%ecx) /* msl of b */
- addl %eax,-12(%ebp)
- adcl %edx,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull (%ecx) /* lsl of b */
- addl %eax,-12(%ebp)
- adcl %edx,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull 4(%ecx) /* msl of b */
- addl %eax,-8(%ebp)
- adcl %edx,-4(%ebp)
- movl -12(%ebp),%eax
- movl %eax,(%esi)
- movl -8(%ebp),%eax
- movl %eax,4(%esi)
- movl -4(%ebp),%eax
- movl %eax,8(%esi)
- popl %esi
- leave
- ret
- ENTRY(mul_Xsig_Xsig)
- pushl %ebp
- movl %esp,%ebp
- subl $16,%esp
- pushl %esi
- movl PARAM1,%esi
- movl PARAM2,%ecx
- xor %eax,%eax
- movl %eax,-4(%ebp)
- movl %eax,-8(%ebp)
- movl (%esi),%eax /* lsl of Xsig */
- mull 8(%ecx) /* msl of b */
- movl %edx,-12(%ebp)
- movl 4(%esi),%eax /* midl of Xsig */
- mull 4(%ecx) /* midl of b */
- addl %edx,-12(%ebp)
- adcl $0,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull (%ecx) /* lsl of b */
- addl %edx,-12(%ebp)
- adcl $0,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 4(%esi),%eax /* midl of Xsig */
- mull 8(%ecx) /* msl of b */
- addl %eax,-12(%ebp)
- adcl %edx,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull 4(%ecx) /* midl of b */
- addl %eax,-12(%ebp)
- adcl %edx,-8(%ebp)
- adcl $0,-4(%ebp)
- movl 8(%esi),%eax /* msl of Xsig */
- mull 8(%ecx) /* msl of b */
- addl %eax,-8(%ebp)
- adcl %edx,-4(%ebp)
- movl -12(%ebp),%edx
- movl %edx,(%esi)
- movl -8(%ebp),%edx
- movl %edx,4(%esi)
- movl -4(%ebp),%edx
- movl %edx,8(%esi)
- popl %esi
- leave
- ret