diff options
Diffstat (limited to 'arch/x86/math-emu/mul_Xsig.S')
| -rw-r--r-- | arch/x86/math-emu/mul_Xsig.S | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/arch/x86/math-emu/mul_Xsig.S b/arch/x86/math-emu/mul_Xsig.S new file mode 100644 index 000000000..3e489122a --- /dev/null +++ b/arch/x86/math-emu/mul_Xsig.S @@ -0,0 +1,179 @@ +/* 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 +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 +ENDPROC(mul32_Xsig) + + +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 +ENDPROC(mul64_Xsig) + + + +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 +ENDPROC(mul_Xsig_Xsig) |