| /* |
| * Basic four-word fraction declaration and manipulation. |
| * |
| * When adding quadword support for 32 bit machines, we need |
| * to be a little careful as double multiply uses some of these |
| * macros: (in op-2.h) |
| * _FP_MUL_MEAT_2_wide() uses _FP_FRAC_DECL_4, _FP_FRAC_WORD_4, |
| * _FP_FRAC_ADD_4, _FP_FRAC_SRS_4 |
| * _FP_MUL_MEAT_2_gmp() uses _FP_FRAC_SRS_4 (and should use |
| * _FP_FRAC_DECL_4: it appears to be broken and is not used |
| * anywhere anyway. ) |
| * |
| * I've now fixed all the macros that were here from the sparc64 code. |
| * [*none* of the shift macros were correct!] -- PMM 02/1998 |
| * |
| * The only quadword stuff that remains to be coded is: |
| * 1) the conversion to/from ints, which requires |
| * that we check (in op-common.h) that the following do the right thing |
| * for quadwords: _FP_TO_INT(Q,4,r,X,rsz,rsg), _FP_FROM_INT(Q,4,X,r,rs,rt) |
| * 2) multiply, divide and sqrt, which require: |
| * _FP_MUL_MEAT_4_*(R,X,Y), _FP_DIV_MEAT_4_*(R,X,Y), _FP_SQRT_MEAT_4(R,S,T,X,q), |
| * This also needs _FP_MUL_MEAT_Q and _FP_DIV_MEAT_Q to be defined to |
| * some suitable _FP_MUL_MEAT_4_* macros in sfp-machine.h. |
| * [we're free to choose whatever FP_MUL_MEAT_4_* macros we need for |
| * these; they are used nowhere else. ] |
| */ |
| |
| #define _FP_FRAC_DECL_4(X) _FP_W_TYPE X##_f[4] |
| #define _FP_FRAC_COPY_4(D,S) \ |
| (D##_f[0] = S##_f[0], D##_f[1] = S##_f[1], \ |
| D##_f[2] = S##_f[2], D##_f[3] = S##_f[3]) |
| /* The _FP_FRAC_SET_n(X,I) macro is intended for use with another |
| * macro such as _FP_ZEROFRAC_n which returns n comma separated values. |
| * The result is that we get an expansion of __FP_FRAC_SET_n(X,I0,I1,I2,I3) |
| * which just assigns the In values to the array X##_f[]. |
| * This is why the number of parameters doesn't appear to match |
| * at first glance... -- PMM |
| */ |
| #define _FP_FRAC_SET_4(X,I) __FP_FRAC_SET_4(X, I) |
| #define _FP_FRAC_HIGH_4(X) (X##_f[3]) |
| #define _FP_FRAC_LOW_4(X) (X##_f[0]) |
| #define _FP_FRAC_WORD_4(X,w) (X##_f[w]) |
| |
| #define _FP_FRAC_SLL_4(X,N) \ |
| do { \ |
| _FP_I_TYPE _up, _down, _skip, _i; \ |
| _skip = (N) / _FP_W_TYPE_SIZE; \ |
| _up = (N) % _FP_W_TYPE_SIZE; \ |
| _down = _FP_W_TYPE_SIZE - _up; \ |
| for (_i = 3; _i > _skip; --_i) \ |
| X##_f[_i] = X##_f[_i-_skip] << _up | X##_f[_i-_skip-1] >> _down; \ |
| /* bugfixed: was X##_f[_i] <<= _up; -- PMM 02/1998 */ \ |
| X##_f[_i] = X##_f[0] << _up; \ |
| for (--_i; _i >= 0; --_i) \ |
| X##_f[_i] = 0; \ |
| } while (0) |
| |
| /* This one was broken too */ |
| #define _FP_FRAC_SRL_4(X,N) \ |
| do { \ |
| _FP_I_TYPE _up, _down, _skip, _i; \ |
| _skip = (N) / _FP_W_TYPE_SIZE; \ |
| _down = (N) % _FP_W_TYPE_SIZE; \ |
| _up = _FP_W_TYPE_SIZE - _down; \ |
| for (_i = 0; _i < 3-_skip; ++_i) \ |
| X##_f[_i] = X##_f[_i+_skip] >> _down | X##_f[_i+_skip+1] << _up; \ |
| X##_f[_i] = X##_f[3] >> _down; \ |
| for (++_i; _i < 4; ++_i) \ |
| X##_f[_i] = 0; \ |
| } while (0) |
| |
| |
| /* Right shift with sticky-lsb. |
| * What this actually means is that we do a standard right-shift, |
| * but that if any of the bits that fall off the right hand side |
| * were one then we always set the LSbit. |
| */ |
| #define _FP_FRAC_SRS_4(X,N,size) \ |
| do { \ |
| _FP_I_TYPE _up, _down, _skip, _i; \ |
| _FP_W_TYPE _s; \ |
| _skip = (N) / _FP_W_TYPE_SIZE; \ |
| _down = (N) % _FP_W_TYPE_SIZE; \ |
| _up = _FP_W_TYPE_SIZE - _down; \ |
| for (_s = _i = 0; _i < _skip; ++_i) \ |
| _s |= X##_f[_i]; \ |
| _s |= X##_f[_i] << _up; \ |
| /* s is now != 0 if we want to set the LSbit */ \ |
| for (_i = 0; _i < 3-_skip; ++_i) \ |
| X##_f[_i] = X##_f[_i+_skip] >> _down | X##_f[_i+_skip+1] << _up; \ |
| X##_f[_i] = X##_f[3] >> _down; \ |
| for (++_i; _i < 4; ++_i) \ |
| X##_f[_i] = 0; \ |
| /* don't fix the LSB until the very end when we're sure f[0] is stable */ \ |
| X##_f[0] |= (_s != 0); \ |
| } while (0) |
| |
| #define _FP_FRAC_ADD_4(R,X,Y) \ |
| __FP_FRAC_ADD_4(R##_f[3], R##_f[2], R##_f[1], R##_f[0], \ |
| X##_f[3], X##_f[2], X##_f[1], X##_f[0], \ |
| Y##_f[3], Y##_f[2], Y##_f[1], Y##_f[0]) |
| |
| #define _FP_FRAC_SUB_4(R,X,Y) \ |
| __FP_FRAC_SUB_4(R##_f[3], R##_f[2], R##_f[1], R##_f[0], \ |
| X##_f[3], X##_f[2], X##_f[1], X##_f[0], \ |
| Y##_f[3], Y##_f[2], Y##_f[1], Y##_f[0]) |
| |
| #define _FP_FRAC_ADDI_4(X,I) \ |
| __FP_FRAC_ADDI_4(X##_f[3], X##_f[2], X##_f[1], X##_f[0], I) |
| |
| #define _FP_ZEROFRAC_4 0,0,0,0 |
| #define _FP_MINFRAC_4 0,0,0,1 |
| |
| #define _FP_FRAC_ZEROP_4(X) ((X##_f[0] | X##_f[1] | X##_f[2] | X##_f[3]) == 0) |
| #define _FP_FRAC_NEGP_4(X) ((_FP_WS_TYPE)X##_f[3] < 0) |
| #define _FP_FRAC_OVERP_4(fs,X) (X##_f[0] & _FP_OVERFLOW_##fs) |
| |
| #define _FP_FRAC_EQ_4(X,Y) \ |
| (X##_f[0] == Y##_f[0] && X##_f[1] == Y##_f[1] \ |
| && X##_f[2] == Y##_f[2] && X##_f[3] == Y##_f[3]) |
| |
| #define _FP_FRAC_GT_4(X,Y) \ |
| (X##_f[3] > Y##_f[3] || \ |
| (X##_f[3] == Y##_f[3] && (X##_f[2] > Y##_f[2] || \ |
| (X##_f[2] == Y##_f[2] && (X##_f[1] > Y##_f[1] || \ |
| (X##_f[1] == Y##_f[1] && X##_f[0] > Y##_f[0]) \ |
| )) \ |
| )) \ |
| ) |
| |
| #define _FP_FRAC_GE_4(X,Y) \ |
| (X##_f[3] > Y##_f[3] || \ |
| (X##_f[3] == Y##_f[3] && (X##_f[2] > Y##_f[2] || \ |
| (X##_f[2] == Y##_f[2] && (X##_f[1] > Y##_f[1] || \ |
| (X##_f[1] == Y##_f[1] && X##_f[0] >= Y##_f[0]) \ |
| )) \ |
| )) \ |
| ) |
| |
| |
| #define _FP_FRAC_CLZ_4(R,X) \ |
| do { \ |
| if (X##_f[3]) \ |
| { \ |
| __FP_CLZ(R,X##_f[3]); \ |
| } \ |
| else if (X##_f[2]) \ |
| { \ |
| __FP_CLZ(R,X##_f[2]); \ |
| R += _FP_W_TYPE_SIZE; \ |
| } \ |
| else if (X##_f[1]) \ |
| { \ |
| __FP_CLZ(R,X##_f[2]); \ |
| R += _FP_W_TYPE_SIZE*2; \ |
| } \ |
| else \ |
| { \ |
| __FP_CLZ(R,X##_f[0]); \ |
| R += _FP_W_TYPE_SIZE*3; \ |
| } \ |
| } while(0) |
| |
| |
| #define _FP_UNPACK_RAW_4(fs, X, val) \ |
| do { \ |
| union _FP_UNION_##fs _flo; _flo.flt = (val); \ |
| X##_f[0] = _flo.bits.frac0; \ |
| X##_f[1] = _flo.bits.frac1; \ |
| X##_f[2] = _flo.bits.frac2; \ |
| X##_f[3] = _flo.bits.frac3; \ |
| X##_e = _flo.bits.exp; \ |
| X##_s = _flo.bits.sign; \ |
| } while (0) |
| |
| #define _FP_PACK_RAW_4(fs, val, X) \ |
| do { \ |
| union _FP_UNION_##fs _flo; \ |
| _flo.bits.frac0 = X##_f[0]; \ |
| _flo.bits.frac1 = X##_f[1]; \ |
| _flo.bits.frac2 = X##_f[2]; \ |
| _flo.bits.frac3 = X##_f[3]; \ |
| _flo.bits.exp = X##_e; \ |
| _flo.bits.sign = X##_s; \ |
| (val) = _flo.flt; \ |
| } while (0) |
| |
| |
| /* |
| * Internals |
| */ |
| |
| #define __FP_FRAC_SET_4(X,I3,I2,I1,I0) \ |
| (X##_f[3] = I3, X##_f[2] = I2, X##_f[1] = I1, X##_f[0] = I0) |
| |
| #ifndef __FP_FRAC_ADD_4 |
| #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \ |
| do { \ |
| int _c1, _c2, _c3; \ |
| r0 = x0 + y0; \ |
| _c1 = r0 < x0; \ |
| r1 = x1 + y1; \ |
| _c2 = r1 < x1; \ |
| r1 += _c1; \ |
| _c2 |= r1 < _c1; \ |
| r2 = x2 + y2; \ |
| _c3 = r2 < x2; \ |
| r2 += _c2; \ |
| _c3 |= r2 < _c2; \ |
| r3 = x3 + y3 + _c3; \ |
| } while (0) |
| #endif |
| |
| #ifndef __FP_FRAC_SUB_4 |
| #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0) \ |
| do { \ |
| int _c1, _c2, _c3; \ |
| r0 = x0 - y0; \ |
| _c1 = r0 > x0; \ |
| r1 = x1 - y1; \ |
| _c2 = r1 > x1; \ |
| r1 -= _c1; \ |
| _c2 |= r1 > _c1; \ |
| r2 = x2 - y2; \ |
| _c3 = r2 > x2; \ |
| r2 -= _c2; \ |
| _c3 |= r2 > _c2; \ |
| r3 = x3 - y3 - _c3; \ |
| } while (0) |
| #endif |
| |
| #ifndef __FP_FRAC_ADDI_4 |
| /* I always wanted to be a lisp programmer :-> */ |
| #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i) \ |
| (x3 += ((x2 += ((x1 += ((x0 += i) < x0)) < x1) < x2))) |
| #endif |
| |
| /* Convert FP values between word sizes. This appears to be more |
| * complicated than I'd have expected it to be, so these might be |
| * wrong... These macros are in any case somewhat bogus because they |
| * use information about what various FRAC_n variables look like |
| * internally [eg, that 2 word vars are X_f0 and x_f1]. But so do |
| * the ones in op-2.h and op-1.h. |
| */ |
| #define _FP_FRAC_CONV_1_4(dfs, sfs, D, S) \ |
| do { \ |
| _FP_FRAC_SRS_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs), \ |
| _FP_WFRACBITS_##sfs); \ |
| D##_f = S##_f[0]; \ |
| } while (0) |
| |
| #define _FP_FRAC_CONV_2_4(dfs, sfs, D, S) \ |
| do { \ |
| _FP_FRAC_SRS_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs), \ |
| _FP_WFRACBITS_##sfs); \ |
| D##_f0 = S##_f[0]; \ |
| D##_f1 = S##_f[1]; \ |
| } while (0) |
| |
| /* Assembly/disassembly for converting to/from integral types. |
| * No shifting or overflow handled here. |
| */ |
| /* Put the FP value X into r, which is an integer of size rsize. */ |
| #define _FP_FRAC_ASSEMBLE_4(r, X, rsize) \ |
| do { \ |
| if (rsize <= _FP_W_TYPE_SIZE) \ |
| r = X##_f[0]; \ |
| else if (rsize <= 2*_FP_W_TYPE_SIZE) \ |
| { \ |
| r = X##_f[1]; \ |
| r <<= _FP_W_TYPE_SIZE; \ |
| r += X##_f[0]; \ |
| } \ |
| else \ |
| { \ |
| /* I'm feeling lazy so we deal with int == 3words (implausible)*/ \ |
| /* and int == 4words as a single case. */ \ |
| r = X##_f[3]; \ |
| r <<= _FP_W_TYPE_SIZE; \ |
| r += X##_f[2]; \ |
| r <<= _FP_W_TYPE_SIZE; \ |
| r += X##_f[1]; \ |
| r <<= _FP_W_TYPE_SIZE; \ |
| r += X##_f[0]; \ |
| } \ |
| } while (0) |
| |
| /* "No disassemble Number Five!" */ |
| /* move an integer of size rsize into X's fractional part. We rely on |
| * the _f[] array consisting of words of size _FP_W_TYPE_SIZE to avoid |
| * having to mask the values we store into it. |
| */ |
| #define _FP_FRAC_DISASSEMBLE_4(X, r, rsize) \ |
| do { \ |
| X##_f[0] = r; \ |
| X##_f[1] = (rsize <= _FP_W_TYPE_SIZE ? 0 : r >> _FP_W_TYPE_SIZE); \ |
| X##_f[2] = (rsize <= 2*_FP_W_TYPE_SIZE ? 0 : r >> 2*_FP_W_TYPE_SIZE); \ |
| X##_f[3] = (rsize <= 3*_FP_W_TYPE_SIZE ? 0 : r >> 3*_FP_W_TYPE_SIZE); \ |
| } while (0) |
| |
| #define _FP_FRAC_CONV_4_1(dfs, sfs, D, S) \ |
| do { \ |
| D##_f[0] = S##_f; \ |
| D##_f[1] = D##_f[2] = D##_f[3] = 0; \ |
| _FP_FRAC_SLL_4(D, (_FP_WFRACBITS_##dfs - _FP_WFRACBITS_##sfs)); \ |
| } while (0) |
| |
| #define _FP_FRAC_CONV_4_2(dfs, sfs, D, S) \ |
| do { \ |
| D##_f[0] = S##_f0; \ |
| D##_f[1] = S##_f1; \ |
| D##_f[2] = D##_f[3] = 0; \ |
| _FP_FRAC_SLL_4(D, (_FP_WFRACBITS_##dfs - _FP_WFRACBITS_##sfs)); \ |
| } while (0) |
| |
| /* FIXME! This has to be written */ |
| #define _FP_SQRT_MEAT_4(R, S, T, X, q) |
