/* SPDX-License-Identifier: GPL-2.0 */
/*---------------------------------------------------------------------------+
| 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
SYM_FUNC_START(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
SYM_FUNC_END(mul32_Xsig)
SYM_FUNC_START(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
SYM_FUNC_END(mul64_Xsig)
SYM_FUNC_START(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
SYM_FUNC_END(mul_Xsig_Xsig)
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