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115 lines
4.6 KiB
115 lines
4.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/*---------------------------------------------------------------------------+ |
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| poly.h | |
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| Header file for the FPU-emu poly*.c source files. | |
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| Copyright (C) 1994,1999 | |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | |
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| Australia. E-mail [email protected] | |
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| Declarations and definitions for functions operating on Xsig (12-byte | |
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| extended-significand) quantities. | |
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+---------------------------------------------------------------------------*/ |
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#ifndef _POLY_H |
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#define _POLY_H |
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/* This 12-byte structure is used to improve the accuracy of computation |
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of transcendental functions. |
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Intended to be used to get results better than 8-byte computation |
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allows. 9-byte would probably be sufficient. |
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*/ |
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typedef struct { |
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unsigned long lsw; |
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unsigned long midw; |
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unsigned long msw; |
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} Xsig; |
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asmlinkage void mul64(unsigned long long const *a, unsigned long long const *b, |
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unsigned long long *result); |
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asmlinkage void polynomial_Xsig(Xsig *, const unsigned long long *x, |
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const unsigned long long terms[], const int n); |
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asmlinkage void mul32_Xsig(Xsig *, const unsigned long mult); |
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asmlinkage void mul64_Xsig(Xsig *, const unsigned long long *mult); |
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asmlinkage void mul_Xsig_Xsig(Xsig *dest, const Xsig *mult); |
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asmlinkage void shr_Xsig(Xsig *, const int n); |
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asmlinkage int round_Xsig(Xsig *); |
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asmlinkage int norm_Xsig(Xsig *); |
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asmlinkage void div_Xsig(Xsig *x1, const Xsig *x2, const Xsig *dest); |
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/* Macro to extract the most significant 32 bits from a long long */ |
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#define LL_MSW(x) (((unsigned long *)&x)[1]) |
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/* Macro to initialize an Xsig struct */ |
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#define MK_XSIG(a,b,c) { c, b, a } |
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/* Macro to access the 8 ms bytes of an Xsig as a long long */ |
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#define XSIG_LL(x) (*(unsigned long long *)&x.midw) |
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/* |
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Need to run gcc with optimizations on to get these to |
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actually be in-line. |
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*/ |
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/* Multiply two fixed-point 32 bit numbers, producing a 32 bit result. |
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The answer is the ms word of the product. */ |
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/* Some versions of gcc make it difficult to stop eax from being clobbered. |
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Merely specifying that it is used doesn't work... |
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*/ |
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static inline unsigned long mul_32_32(const unsigned long arg1, |
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const unsigned long arg2) |
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{ |
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int retval; |
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asm volatile ("mull %2; movl %%edx,%%eax":"=a" (retval) |
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:"0"(arg1), "g"(arg2) |
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:"dx"); |
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return retval; |
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} |
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/* Add the 12 byte Xsig x2 to Xsig dest, with no checks for overflow. */ |
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static inline void add_Xsig_Xsig(Xsig *dest, const Xsig *x2) |
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{ |
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asm volatile ("movl %1,%%edi; movl %2,%%esi;\n" |
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"movl (%%esi),%%eax; addl %%eax,(%%edi);\n" |
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"movl 4(%%esi),%%eax; adcl %%eax,4(%%edi);\n" |
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"movl 8(%%esi),%%eax; adcl %%eax,8(%%edi);\n":"=g" |
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(*dest):"g"(dest), "g"(x2) |
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:"ax", "si", "di"); |
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} |
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/* Add the 12 byte Xsig x2 to Xsig dest, adjust exp if overflow occurs. */ |
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/* Note: the constraints in the asm statement didn't always work properly |
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with gcc 2.5.8. Changing from using edi to using ecx got around the |
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problem, but keep fingers crossed! */ |
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static inline void add_two_Xsig(Xsig *dest, const Xsig *x2, long int *exp) |
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{ |
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asm volatile ("movl %2,%%ecx; movl %3,%%esi;\n" |
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"movl (%%esi),%%eax; addl %%eax,(%%ecx);\n" |
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"movl 4(%%esi),%%eax; adcl %%eax,4(%%ecx);\n" |
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"movl 8(%%esi),%%eax; adcl %%eax,8(%%ecx);\n" |
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"jnc 0f;\n" |
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"rcrl 8(%%ecx); rcrl 4(%%ecx); rcrl (%%ecx)\n" |
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"movl %4,%%ecx; incl (%%ecx)\n" |
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"movl $1,%%eax; jmp 1f;\n" |
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"0: xorl %%eax,%%eax;\n" "1:\n":"=g" (*exp), "=g"(*dest) |
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:"g"(dest), "g"(x2), "g"(exp) |
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:"cx", "si", "ax"); |
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} |
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/* Negate (subtract from 1.0) the 12 byte Xsig */ |
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/* This is faster in a loop on my 386 than using the "neg" instruction. */ |
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static inline void negate_Xsig(Xsig *x) |
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{ |
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asm volatile ("movl %1,%%esi;\n" |
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"xorl %%ecx,%%ecx;\n" |
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"movl %%ecx,%%eax; subl (%%esi),%%eax; movl %%eax,(%%esi);\n" |
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"movl %%ecx,%%eax; sbbl 4(%%esi),%%eax; movl %%eax,4(%%esi);\n" |
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"movl %%ecx,%%eax; sbbl 8(%%esi),%%eax; movl %%eax,8(%%esi);\n":"=g" |
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(*x):"g"(x):"si", "ax", "cx"); |
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} |
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#endif /* _POLY_H */
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