Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | | |
| 2 | | do_func.sa 3.4 2/18/91 |
| 3 | | |
| 4 | | Do_func performs the unimplemented operation. The operation |
| 5 | | to be performed is determined from the lower 7 bits of the |
| 6 | | extension word (except in the case of fmovecr and fsincos). |
| 7 | | The opcode and tag bits form an index into a jump table in |
| 8 | | tbldo.sa. Cases of zero, infinity and NaN are handled in |
| 9 | | do_func by forcing the default result. Normalized and |
| 10 | | denormalized (there are no unnormalized numbers at this |
| 11 | | point) are passed onto the emulation code. |
| 12 | | |
| 13 | | CMDREG1B and STAG are extracted from the fsave frame |
| 14 | | and combined to form the table index. The function called |
| 15 | | will start with a0 pointing to the ETEMP operand. Dyadic |
| 16 | | functions can find FPTEMP at -12(a0). |
| 17 | | |
| 18 | | Called functions return their result in fp0. Sincos returns |
| 19 | | sin(x) in fp0 and cos(x) in fp1. |
| 20 | | |
| 21 | |
| 22 | | Copyright (C) Motorola, Inc. 1990 |
| 23 | | All Rights Reserved |
| 24 | | |
| 25 | | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA |
| 26 | | The copyright notice above does not evidence any |
| 27 | | actual or intended publication of such source code. |
| 28 | |
| 29 | DO_FUNC: |idnt 2,1 | Motorola 040 Floating Point Software Package |
| 30 | |
| 31 | |section 8 |
| 32 | |
| 33 | #include "fpsp.h" |
| 34 | |
| 35 | |xref t_dz2 |
| 36 | |xref t_operr |
| 37 | |xref t_inx2 |
| 38 | |xref t_resdnrm |
| 39 | |xref dst_nan |
| 40 | |xref src_nan |
| 41 | |xref nrm_set |
| 42 | |xref sto_cos |
| 43 | |
| 44 | |xref tblpre |
| 45 | |xref slognp1,slogn,slog10,slog2 |
| 46 | |xref slognd,slog10d,slog2d |
| 47 | |xref smod,srem |
| 48 | |xref sscale |
| 49 | |xref smovcr |
| 50 | |
| 51 | PONE: .long 0x3fff0000,0x80000000,0x00000000 |+1 |
| 52 | MONE: .long 0xbfff0000,0x80000000,0x00000000 |-1 |
| 53 | PZERO: .long 0x00000000,0x00000000,0x00000000 |+0 |
| 54 | MZERO: .long 0x80000000,0x00000000,0x00000000 |-0 |
| 55 | PINF: .long 0x7fff0000,0x00000000,0x00000000 |+inf |
| 56 | MINF: .long 0xffff0000,0x00000000,0x00000000 |-inf |
| 57 | QNAN: .long 0x7fff0000,0xffffffff,0xffffffff |non-signaling nan |
| 58 | PPIBY2: .long 0x3FFF0000,0xC90FDAA2,0x2168C235 |+PI/2 |
| 59 | MPIBY2: .long 0xbFFF0000,0xC90FDAA2,0x2168C235 |-PI/2 |
| 60 | |
| 61 | .global do_func |
| 62 | do_func: |
| 63 | clrb CU_ONLY(%a6) |
| 64 | | |
| 65 | | Check for fmovecr. It does not follow the format of fp gen |
| 66 | | unimplemented instructions. The test is on the upper 6 bits; |
| 67 | | if they are $17, the inst is fmovecr. Call entry smovcr |
| 68 | | directly. |
| 69 | | |
| 70 | bfextu CMDREG1B(%a6){#0:#6},%d0 |get opclass and src fields |
| 71 | cmpil #0x17,%d0 |if op class and size fields are $17, |
| 72 | | ;it is FMOVECR; if not, continue |
| 73 | bnes not_fmovecr |
| 74 | jmp smovcr |fmovecr; jmp directly to emulation |
| 75 | |
| 76 | not_fmovecr: |
| 77 | movew CMDREG1B(%a6),%d0 |
| 78 | andl #0x7F,%d0 |
| 79 | cmpil #0x38,%d0 |if the extension is >= $38, |
| 80 | bge serror |it is illegal |
| 81 | bfextu STAG(%a6){#0:#3},%d1 |
| 82 | lsll #3,%d0 |make room for STAG |
| 83 | addl %d1,%d0 |combine for final index into table |
| 84 | leal tblpre,%a1 |start of monster jump table |
| 85 | movel (%a1,%d0.w*4),%a1 |real target address |
| 86 | leal ETEMP(%a6),%a0 |a0 is pointer to src op |
| 87 | movel USER_FPCR(%a6),%d1 |
| 88 | andl #0xFF,%d1 | discard all but rounding mode/prec |
| 89 | fmovel #0,%fpcr |
| 90 | jmp (%a1) |
| 91 | | |
| 92 | | ERROR |
| 93 | | |
| 94 | .global serror |
| 95 | serror: |
| 96 | st STORE_FLG(%a6) |
| 97 | rts |
| 98 | | |
| 99 | | These routines load forced values into fp0. They are called |
| 100 | | by index into tbldo. |
| 101 | | |
| 102 | | Load a signed zero to fp0 and set inex2/ainex |
| 103 | | |
| 104 | .global snzrinx |
| 105 | snzrinx: |
| 106 | btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand |
| 107 | bnes ld_mzinx |if negative, branch |
| 108 | bsr ld_pzero |bsr so we can return and set inx |
| 109 | bra t_inx2 |now, set the inx for the next inst |
| 110 | ld_mzinx: |
| 111 | bsr ld_mzero |if neg, load neg zero, return here |
| 112 | bra t_inx2 |now, set the inx for the next inst |
| 113 | | |
| 114 | | Load a signed zero to fp0; do not set inex2/ainex |
| 115 | | |
| 116 | .global szero |
| 117 | szero: |
| 118 | btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand |
| 119 | bne ld_mzero |if neg, load neg zero |
| 120 | bra ld_pzero |load positive zero |
| 121 | | |
| 122 | | Load a signed infinity to fp0; do not set inex2/ainex |
| 123 | | |
| 124 | .global sinf |
| 125 | sinf: |
| 126 | btstb #sign_bit,LOCAL_EX(%a0) |get sign of source operand |
| 127 | bne ld_minf |if negative branch |
| 128 | bra ld_pinf |
| 129 | | |
| 130 | | Load a signed one to fp0; do not set inex2/ainex |
| 131 | | |
| 132 | .global sone |
| 133 | sone: |
| 134 | btstb #sign_bit,LOCAL_EX(%a0) |check sign of source |
| 135 | bne ld_mone |
| 136 | bra ld_pone |
| 137 | | |
| 138 | | Load a signed pi/2 to fp0; do not set inex2/ainex |
| 139 | | |
| 140 | .global spi_2 |
| 141 | spi_2: |
| 142 | btstb #sign_bit,LOCAL_EX(%a0) |check sign of source |
| 143 | bne ld_mpi2 |
| 144 | bra ld_ppi2 |
| 145 | | |
| 146 | | Load either a +0 or +inf for plus/minus operand |
| 147 | | |
| 148 | .global szr_inf |
| 149 | szr_inf: |
| 150 | btstb #sign_bit,LOCAL_EX(%a0) |check sign of source |
| 151 | bne ld_pzero |
| 152 | bra ld_pinf |
| 153 | | |
| 154 | | Result is either an operr or +inf for plus/minus operand |
| 155 | | [Used by slogn, slognp1, slog10, and slog2] |
| 156 | | |
| 157 | .global sopr_inf |
| 158 | sopr_inf: |
| 159 | btstb #sign_bit,LOCAL_EX(%a0) |check sign of source |
| 160 | bne t_operr |
| 161 | bra ld_pinf |
| 162 | | |
| 163 | | FLOGNP1 |
| 164 | | |
| 165 | .global sslognp1 |
| 166 | sslognp1: |
| 167 | fmovemx (%a0),%fp0-%fp0 |
| 168 | fcmpb #-1,%fp0 |
| 169 | fbgt slognp1 |
| 170 | fbeq t_dz2 |if = -1, divide by zero exception |
| 171 | fmovel #0,%FPSR |clr N flag |
| 172 | bra t_operr |take care of operands < -1 |
| 173 | | |
| 174 | | FETOXM1 |
| 175 | | |
| 176 | .global setoxm1i |
| 177 | setoxm1i: |
| 178 | btstb #sign_bit,LOCAL_EX(%a0) |check sign of source |
| 179 | bne ld_mone |
| 180 | bra ld_pinf |
| 181 | | |
| 182 | | FLOGN |
| 183 | | |
| 184 | | Test for 1.0 as an input argument, returning +zero. Also check |
| 185 | | the sign and return operr if negative. |
| 186 | | |
| 187 | .global sslogn |
| 188 | sslogn: |
| 189 | btstb #sign_bit,LOCAL_EX(%a0) |
| 190 | bne t_operr |take care of operands < 0 |
| 191 | cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input |
| 192 | bne slogn |
| 193 | cmpil #0x80000000,LOCAL_HI(%a0) |
| 194 | bne slogn |
| 195 | tstl LOCAL_LO(%a0) |
| 196 | bne slogn |
| 197 | fmovex PZERO,%fp0 |
| 198 | rts |
| 199 | |
| 200 | .global sslognd |
| 201 | sslognd: |
| 202 | btstb #sign_bit,LOCAL_EX(%a0) |
| 203 | beq slognd |
| 204 | bra t_operr |take care of operands < 0 |
| 205 | |
| 206 | | |
| 207 | | FLOG10 |
| 208 | | |
| 209 | .global sslog10 |
| 210 | sslog10: |
| 211 | btstb #sign_bit,LOCAL_EX(%a0) |
| 212 | bne t_operr |take care of operands < 0 |
| 213 | cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input |
| 214 | bne slog10 |
| 215 | cmpil #0x80000000,LOCAL_HI(%a0) |
| 216 | bne slog10 |
| 217 | tstl LOCAL_LO(%a0) |
| 218 | bne slog10 |
| 219 | fmovex PZERO,%fp0 |
| 220 | rts |
| 221 | |
| 222 | .global sslog10d |
| 223 | sslog10d: |
| 224 | btstb #sign_bit,LOCAL_EX(%a0) |
| 225 | beq slog10d |
| 226 | bra t_operr |take care of operands < 0 |
| 227 | |
| 228 | | |
| 229 | | FLOG2 |
| 230 | | |
| 231 | .global sslog2 |
| 232 | sslog2: |
| 233 | btstb #sign_bit,LOCAL_EX(%a0) |
| 234 | bne t_operr |take care of operands < 0 |
| 235 | cmpiw #0x3fff,LOCAL_EX(%a0) |test for 1.0 input |
| 236 | bne slog2 |
| 237 | cmpil #0x80000000,LOCAL_HI(%a0) |
| 238 | bne slog2 |
| 239 | tstl LOCAL_LO(%a0) |
| 240 | bne slog2 |
| 241 | fmovex PZERO,%fp0 |
| 242 | rts |
| 243 | |
| 244 | .global sslog2d |
| 245 | sslog2d: |
| 246 | btstb #sign_bit,LOCAL_EX(%a0) |
| 247 | beq slog2d |
| 248 | bra t_operr |take care of operands < 0 |
| 249 | |
| 250 | | |
| 251 | | FMOD |
| 252 | | |
| 253 | pmodt: |
| 254 | | ;$21 fmod |
| 255 | | ;dtag,stag |
| 256 | .long smod | 00,00 norm,norm = normal |
| 257 | .long smod_oper | 00,01 norm,zero = nan with operr |
| 258 | .long smod_fpn | 00,10 norm,inf = fpn |
| 259 | .long smod_snan | 00,11 norm,nan = nan |
| 260 | .long smod_zro | 01,00 zero,norm = +-zero |
| 261 | .long smod_oper | 01,01 zero,zero = nan with operr |
| 262 | .long smod_zro | 01,10 zero,inf = +-zero |
| 263 | .long smod_snan | 01,11 zero,nan = nan |
| 264 | .long smod_oper | 10,00 inf,norm = nan with operr |
| 265 | .long smod_oper | 10,01 inf,zero = nan with operr |
| 266 | .long smod_oper | 10,10 inf,inf = nan with operr |
| 267 | .long smod_snan | 10,11 inf,nan = nan |
| 268 | .long smod_dnan | 11,00 nan,norm = nan |
| 269 | .long smod_dnan | 11,01 nan,zero = nan |
| 270 | .long smod_dnan | 11,10 nan,inf = nan |
| 271 | .long smod_dnan | 11,11 nan,nan = nan |
| 272 | |
| 273 | .global pmod |
| 274 | pmod: |
| 275 | clrb FPSR_QBYTE(%a6) | clear quotient field |
| 276 | bfextu STAG(%a6){#0:#3},%d0 |stag = d0 |
| 277 | bfextu DTAG(%a6){#0:#3},%d1 |dtag = d1 |
| 278 | |
| 279 | | |
| 280 | | Alias extended denorms to norms for the jump table. |
| 281 | | |
| 282 | bclrl #2,%d0 |
| 283 | bclrl #2,%d1 |
| 284 | |
| 285 | lslb #2,%d1 |
| 286 | orb %d0,%d1 |d1{3:2} = dtag, d1{1:0} = stag |
| 287 | | ;Tag values: |
| 288 | | ;00 = norm or denorm |
| 289 | | ;01 = zero |
| 290 | | ;10 = inf |
| 291 | | ;11 = nan |
| 292 | lea pmodt,%a1 |
| 293 | movel (%a1,%d1.w*4),%a1 |
| 294 | jmp (%a1) |
| 295 | |
| 296 | smod_snan: |
| 297 | bra src_nan |
| 298 | smod_dnan: |
| 299 | bra dst_nan |
| 300 | smod_oper: |
| 301 | bra t_operr |
| 302 | smod_zro: |
| 303 | moveb ETEMP(%a6),%d1 |get sign of src op |
| 304 | moveb FPTEMP(%a6),%d0 |get sign of dst op |
| 305 | eorb %d0,%d1 |get exor of sign bits |
| 306 | btstl #7,%d1 |test for sign |
| 307 | beqs smod_zsn |if clr, do not set sign big |
| 308 | bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit |
| 309 | smod_zsn: |
| 310 | btstl #7,%d0 |test if + or - |
| 311 | beq ld_pzero |if pos then load +0 |
| 312 | bra ld_mzero |else neg load -0 |
| 313 | |
| 314 | smod_fpn: |
| 315 | moveb ETEMP(%a6),%d1 |get sign of src op |
| 316 | moveb FPTEMP(%a6),%d0 |get sign of dst op |
| 317 | eorb %d0,%d1 |get exor of sign bits |
| 318 | btstl #7,%d1 |test for sign |
| 319 | beqs smod_fsn |if clr, do not set sign big |
| 320 | bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit |
| 321 | smod_fsn: |
| 322 | tstb DTAG(%a6) |filter out denormal destination case |
| 323 | bpls smod_nrm | |
| 324 | leal FPTEMP(%a6),%a0 |a0<- addr(FPTEMP) |
| 325 | bra t_resdnrm |force UNFL(but exact) result |
| 326 | smod_nrm: |
| 327 | fmovel USER_FPCR(%a6),%fpcr |use user's rmode and precision |
| 328 | fmovex FPTEMP(%a6),%fp0 |return dest to fp0 |
| 329 | rts |
| 330 | |
| 331 | | |
| 332 | | FREM |
| 333 | | |
| 334 | premt: |
| 335 | | ;$25 frem |
| 336 | | ;dtag,stag |
| 337 | .long srem | 00,00 norm,norm = normal |
| 338 | .long srem_oper | 00,01 norm,zero = nan with operr |
| 339 | .long srem_fpn | 00,10 norm,inf = fpn |
| 340 | .long srem_snan | 00,11 norm,nan = nan |
| 341 | .long srem_zro | 01,00 zero,norm = +-zero |
| 342 | .long srem_oper | 01,01 zero,zero = nan with operr |
| 343 | .long srem_zro | 01,10 zero,inf = +-zero |
| 344 | .long srem_snan | 01,11 zero,nan = nan |
| 345 | .long srem_oper | 10,00 inf,norm = nan with operr |
| 346 | .long srem_oper | 10,01 inf,zero = nan with operr |
| 347 | .long srem_oper | 10,10 inf,inf = nan with operr |
| 348 | .long srem_snan | 10,11 inf,nan = nan |
| 349 | .long srem_dnan | 11,00 nan,norm = nan |
| 350 | .long srem_dnan | 11,01 nan,zero = nan |
| 351 | .long srem_dnan | 11,10 nan,inf = nan |
| 352 | .long srem_dnan | 11,11 nan,nan = nan |
| 353 | |
| 354 | .global prem |
| 355 | prem: |
| 356 | clrb FPSR_QBYTE(%a6) |clear quotient field |
| 357 | bfextu STAG(%a6){#0:#3},%d0 |stag = d0 |
| 358 | bfextu DTAG(%a6){#0:#3},%d1 |dtag = d1 |
| 359 | | |
| 360 | | Alias extended denorms to norms for the jump table. |
| 361 | | |
| 362 | bclr #2,%d0 |
| 363 | bclr #2,%d1 |
| 364 | |
| 365 | lslb #2,%d1 |
| 366 | orb %d0,%d1 |d1{3:2} = dtag, d1{1:0} = stag |
| 367 | | ;Tag values: |
| 368 | | ;00 = norm or denorm |
| 369 | | ;01 = zero |
| 370 | | ;10 = inf |
| 371 | | ;11 = nan |
| 372 | lea premt,%a1 |
| 373 | movel (%a1,%d1.w*4),%a1 |
| 374 | jmp (%a1) |
| 375 | |
| 376 | srem_snan: |
| 377 | bra src_nan |
| 378 | srem_dnan: |
| 379 | bra dst_nan |
| 380 | srem_oper: |
| 381 | bra t_operr |
| 382 | srem_zro: |
| 383 | moveb ETEMP(%a6),%d1 |get sign of src op |
| 384 | moveb FPTEMP(%a6),%d0 |get sign of dst op |
| 385 | eorb %d0,%d1 |get exor of sign bits |
| 386 | btstl #7,%d1 |test for sign |
| 387 | beqs srem_zsn |if clr, do not set sign big |
| 388 | bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit |
| 389 | srem_zsn: |
| 390 | btstl #7,%d0 |test if + or - |
| 391 | beq ld_pzero |if pos then load +0 |
| 392 | bra ld_mzero |else neg load -0 |
| 393 | |
| 394 | srem_fpn: |
| 395 | moveb ETEMP(%a6),%d1 |get sign of src op |
| 396 | moveb FPTEMP(%a6),%d0 |get sign of dst op |
| 397 | eorb %d0,%d1 |get exor of sign bits |
| 398 | btstl #7,%d1 |test for sign |
| 399 | beqs srem_fsn |if clr, do not set sign big |
| 400 | bsetb #q_sn_bit,FPSR_QBYTE(%a6) |set q-byte sign bit |
| 401 | srem_fsn: |
| 402 | tstb DTAG(%a6) |filter out denormal destination case |
| 403 | bpls srem_nrm | |
| 404 | leal FPTEMP(%a6),%a0 |a0<- addr(FPTEMP) |
| 405 | bra t_resdnrm |force UNFL(but exact) result |
| 406 | srem_nrm: |
| 407 | fmovel USER_FPCR(%a6),%fpcr |use user's rmode and precision |
| 408 | fmovex FPTEMP(%a6),%fp0 |return dest to fp0 |
| 409 | rts |
| 410 | | |
| 411 | | FSCALE |
| 412 | | |
| 413 | pscalet: |
| 414 | | ;$26 fscale |
| 415 | | ;dtag,stag |
| 416 | .long sscale | 00,00 norm,norm = result |
| 417 | .long sscale | 00,01 norm,zero = fpn |
| 418 | .long scl_opr | 00,10 norm,inf = nan with operr |
| 419 | .long scl_snan | 00,11 norm,nan = nan |
| 420 | .long scl_zro | 01,00 zero,norm = +-zero |
| 421 | .long scl_zro | 01,01 zero,zero = +-zero |
| 422 | .long scl_opr | 01,10 zero,inf = nan with operr |
| 423 | .long scl_snan | 01,11 zero,nan = nan |
| 424 | .long scl_inf | 10,00 inf,norm = +-inf |
| 425 | .long scl_inf | 10,01 inf,zero = +-inf |
| 426 | .long scl_opr | 10,10 inf,inf = nan with operr |
| 427 | .long scl_snan | 10,11 inf,nan = nan |
| 428 | .long scl_dnan | 11,00 nan,norm = nan |
| 429 | .long scl_dnan | 11,01 nan,zero = nan |
| 430 | .long scl_dnan | 11,10 nan,inf = nan |
| 431 | .long scl_dnan | 11,11 nan,nan = nan |
| 432 | |
| 433 | .global pscale |
| 434 | pscale: |
| 435 | bfextu STAG(%a6){#0:#3},%d0 |stag in d0 |
| 436 | bfextu DTAG(%a6){#0:#3},%d1 |dtag in d1 |
| 437 | bclrl #2,%d0 |alias denorm into norm |
| 438 | bclrl #2,%d1 |alias denorm into norm |
| 439 | lslb #2,%d1 |
| 440 | orb %d0,%d1 |d1{4:2} = dtag, d1{1:0} = stag |
| 441 | | ;dtag values stag values: |
| 442 | | ;000 = norm 00 = norm |
| 443 | | ;001 = zero 01 = zero |
| 444 | | ;010 = inf 10 = inf |
| 445 | | ;011 = nan 11 = nan |
| 446 | | ;100 = dnrm |
| 447 | | |
| 448 | | |
| 449 | leal pscalet,%a1 |load start of jump table |
| 450 | movel (%a1,%d1.w*4),%a1 |load a1 with label depending on tag |
| 451 | jmp (%a1) |go to the routine |
| 452 | |
| 453 | scl_opr: |
| 454 | bra t_operr |
| 455 | |
| 456 | scl_dnan: |
| 457 | bra dst_nan |
| 458 | |
| 459 | scl_zro: |
| 460 | btstb #sign_bit,FPTEMP_EX(%a6) |test if + or - |
| 461 | beq ld_pzero |if pos then load +0 |
| 462 | bra ld_mzero |if neg then load -0 |
| 463 | scl_inf: |
| 464 | btstb #sign_bit,FPTEMP_EX(%a6) |test if + or - |
| 465 | beq ld_pinf |if pos then load +inf |
| 466 | bra ld_minf |else neg load -inf |
| 467 | scl_snan: |
| 468 | bra src_nan |
| 469 | | |
| 470 | | FSINCOS |
| 471 | | |
| 472 | .global ssincosz |
| 473 | ssincosz: |
| 474 | btstb #sign_bit,ETEMP(%a6) |get sign |
| 475 | beqs sincosp |
| 476 | fmovex MZERO,%fp0 |
| 477 | bras sincoscom |
| 478 | sincosp: |
| 479 | fmovex PZERO,%fp0 |
| 480 | sincoscom: |
| 481 | fmovemx PONE,%fp1-%fp1 |do not allow FPSR to be affected |
| 482 | bra sto_cos |store cosine result |
| 483 | |
| 484 | .global ssincosi |
| 485 | ssincosi: |
| 486 | fmovex QNAN,%fp1 |load NAN |
| 487 | bsr sto_cos |store cosine result |
| 488 | fmovex QNAN,%fp0 |load NAN |
| 489 | bra t_operr |
| 490 | |
| 491 | .global ssincosnan |
| 492 | ssincosnan: |
| 493 | movel ETEMP_EX(%a6),FP_SCR1(%a6) |
| 494 | movel ETEMP_HI(%a6),FP_SCR1+4(%a6) |
| 495 | movel ETEMP_LO(%a6),FP_SCR1+8(%a6) |
| 496 | bsetb #signan_bit,FP_SCR1+4(%a6) |
| 497 | fmovemx FP_SCR1(%a6),%fp1-%fp1 |
| 498 | bsr sto_cos |
| 499 | bra src_nan |
| 500 | | |
| 501 | | This code forces default values for the zero, inf, and nan cases |
| 502 | | in the transcendentals code. The CC bits must be set in the |
| 503 | | stacked FPSR to be correctly reported. |
| 504 | | |
| 505 | |**Returns +PI/2 |
| 506 | .global ld_ppi2 |
| 507 | ld_ppi2: |
| 508 | fmovex PPIBY2,%fp0 |load +pi/2 |
| 509 | bra t_inx2 |set inex2 exc |
| 510 | |
| 511 | |**Returns -PI/2 |
| 512 | .global ld_mpi2 |
| 513 | ld_mpi2: |
| 514 | fmovex MPIBY2,%fp0 |load -pi/2 |
| 515 | orl #neg_mask,USER_FPSR(%a6) |set N bit |
| 516 | bra t_inx2 |set inex2 exc |
| 517 | |
| 518 | |**Returns +inf |
| 519 | .global ld_pinf |
| 520 | ld_pinf: |
| 521 | fmovex PINF,%fp0 |load +inf |
| 522 | orl #inf_mask,USER_FPSR(%a6) |set I bit |
| 523 | rts |
| 524 | |
| 525 | |**Returns -inf |
| 526 | .global ld_minf |
| 527 | ld_minf: |
| 528 | fmovex MINF,%fp0 |load -inf |
| 529 | orl #neg_mask+inf_mask,USER_FPSR(%a6) |set N and I bits |
| 530 | rts |
| 531 | |
| 532 | |**Returns +1 |
| 533 | .global ld_pone |
| 534 | ld_pone: |
| 535 | fmovex PONE,%fp0 |load +1 |
| 536 | rts |
| 537 | |
| 538 | |**Returns -1 |
| 539 | .global ld_mone |
| 540 | ld_mone: |
| 541 | fmovex MONE,%fp0 |load -1 |
| 542 | orl #neg_mask,USER_FPSR(%a6) |set N bit |
| 543 | rts |
| 544 | |
| 545 | |**Returns +0 |
| 546 | .global ld_pzero |
| 547 | ld_pzero: |
| 548 | fmovex PZERO,%fp0 |load +0 |
| 549 | orl #z_mask,USER_FPSR(%a6) |set Z bit |
| 550 | rts |
| 551 | |
| 552 | |**Returns -0 |
| 553 | .global ld_mzero |
| 554 | ld_mzero: |
| 555 | fmovex MZERO,%fp0 |load -0 |
| 556 | orl #neg_mask+z_mask,USER_FPSR(%a6) |set N and Z bits |
| 557 | rts |
| 558 | |
| 559 | |end |